94420 + Interview Questions in Chemistry in Class 12

1.	Assertion: The first ionisation energy of Be is greater than that of B. Reason: 2p-orbital is lower in energy than 2s-orbital.
Answer» If both ASSERTION and reason are TRUE annd the reason is the correct explanation of assertion If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but the reason is FALSE if assertion is false but the reason is true Answer :C

Discussion

2.	Assertion: The equlibrium constant is fixed and is the charcteristic of any given chameical reaction as a specified temperaturee. Reason: The composition of the final equlibriu mixture at a particular temperaturee depends upon the starting amount of reactants.
Answer» If both ASSERTION and REASON are TREU and the reason is the correct explaination of the assertion. If both assertion and reason are true but reason is not the correct explaination of the assertion. If ASSERTIN is true but reason is false. If assertin is false but reson is true. Answer :C

Discussion

3.	Assertion : The enthalpy of reaction remains constant in the presence of catalyst. Reason : A catalyst participating in the reaction forms different activated complex and lowers down the activation energy of reactant and product remains the same.
Answer» Both ASSERTION and REASON are TRUE and reason is the correct explanation of assertion. Both assertion and reason are true but reason is not the correct explanation of assertion. Assertion is true but reason is false. Both assertion and reason are false. ANSWER :A

Discussion

4.	Assertion : The enthalpy of reaction remains constant in the presence of a catalyst. Reason : A catalyst participating in the reaction forms different activated complex and lowers down the activation energy but the difference in energy of reactant and product remains the same.
Answer» Both ASSERTION and REASON are CORRECT and the reason is correct explananation of assertion. Both assertion and reason are correct but reason does not EXPLAIN assertion. Assertion is correct but reason is incorrect. Both assertion and reason are incorrect. Answer :A

Discussion

5.	Assertion : The enthalpy of formation of gaseous oxygen molecules at 298 K and under pressure of 1 atm is zero.Reason : The entropy of formation of gaseous oxygen molecules under the same condition is zero.
Answer» If both ASSERTION and reason are TRUE and the reason is the correct explanation of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion If assertion is true but reason is false If the assertion and reason both are false. Solution :Assertion and reason SHOW, REACTION at equilibrium state in which `DeltaG=0, DeltaS=0, DeltaH=0`.

Discussion

6.	Assertion : The enthalpies of neutralisation of strong acids and strong bases are always same. Reason : Neutralization is heat of formation of water.
Answer» If the ASSERTION and reason are true and the reason is the CORRECT explanation of the assertion If both assertion and reason are true but reason is not the correct explanation of the assertion If assertion is true but reason is false If the assertion and reason both are false. Solution :The enthalpies of NEUTRALISATION of strong acids and strong bases are same they are 13.7 kcal. The reason is that it is heat of formation of WATER from `H^(+)` and `OH^(-)` ions.`H^(+)+OH^(-)rarrH_(2)O, DeltaH=-13.7 kcal`.THUS, both assertion and reason are true.

Discussion

7.	Assertion: The emf of a cell is related with equilibrium constant of the cell reaction as E_(cell)=(0.0591)/(n)log" "K. Reason: As E_(cell) changes with concentration of the electrodes, K of cell reaction also changes with concentration.
Answer» If both assertion and reason are true, and reason is the true EXPLANATION of the assertion if both assertion and reason are true, but reason is not the true explanation of the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :CORRECT A. Correct relation is `E_(cell)^(@)=(0.0591)/(N)"LOG "K`. Correct R. equilibrium constant is constant at constant temperature and does not change with concentration.

Discussion

8.	Assertion: The electron gain enthalpy of N is +ve while that of P is -ve. Reason: Smaller atomic size of N is which there is a considerable electron-electron repulsion and hence the additional electron is not accepted easily.
Answer» If both assertion and REASON are true ANND the reason is the correct explanation of assertion If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but the reason is false if assertion is false but the reason is true Answer :A

Discussion

9.	Assertion: The electrolysis of auqueous NaCl solution gives hydrogen at the cathode and chlorine at the anode. Reason: Chlorine has higher oxidation potential than water.
Answer» If both ASSERTION and REASON are true, and reason is the true explanation of the assertion if both assertion and reason are true, but reason is not the true explanation of the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :CORRECT R. chlorine has higher reduction potential than water but lower DISCHARGE potential.

Discussion

10.	Assertion : The electrolysis of aqueous NaCl gives hydrogen at the cathode and chlorine at the anode Reason : Chlorine has higher oxidation potential than water
Answer» (A) and (R) are true and (R) is the correct EXPLANATION of (A) Both (A) and (R) are true but (R) does not EXPLAIN (A) (A) is true but (R) is false Both (A) and (R) are false Answer :C

Discussion

11.	Assertion: The dissolution of ammonia in water does not follow henry's law. Reason: Ammonia undergoes ionisation in watrer as NH_(3)+H_(2)O hArr NH_(4)^(+)+OH^(-)
Answer» If both assertion and Reason are true and the Reason is the CORRECT EXPLANATION of the assertion. If both assertion and Reason are true but the reason is not the correct explanation of the assertion If assertion is true but reason is false If both assertion and reason are false. Solution :Henry's law is applicable only for such GASES which do not ionise in solvent, i.e., do not react with solvent.

Discussion

12.	Assertion : The dissociation ofacetic acid decreases on addition of sodium acetate. Reason : It is due to common ion effect.
Answer» (A) and(R ) are CORRECT and (R ) EXPLAINS (A) (A) and (R ) are correct but (R ) does not EXPLAIN (A ) (A) is correct but (R ) is wrong Both (A) and ( R) are false. Answer :A

Discussion

13.	Assertion : The dissociation of acetic acid decreases on addition of sodium acetate. Reason : It is due to common ion effect.
Answer» (A) and ( R) are true and ( R) is the correct EXPLANATION of (A) Both (A) and ( R) are true but ( R) does not explain (A) (A ) is true but (R ) is false Both (A) and ( R) are false Answer :A

Discussion

14.	Assertion : The Daniell cell becomes dead after sometime. Reason : Reduction potential of Zinc increases while that of copper decreases.
Answer» If both ASSERTION and REASON are CORRECT and reason is correct EXPLANATION for assertion. If both assertion and reason are correct but reason is not correct explanation for assertion. If assertion is correct but reason is INCORRECT. If assertion and reason both are incorrect. Solution :(a) Reason is the correct explanation for assertion.

Discussion

15.	Assertion. The depression in freezing point depend on the amount of the solute dissolved and not one the nature of the solute or solvent. Reason. K_(f) for both has different values.
Answer» If both assertion and reason are true, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false. Solution :CORRECT A. The DEPRESSION in freezing point DEPENDS upon the nature of the solvent (because different solvents have different value of `K_(f)`). Correct R. For aqueous solutions of different ELECTROLYTES, `K_(f)` is same because solvent is same, i.e., water.

Discussion

16.	Assertion: The Daniell cell becomes dead after some time. Reason: Oxidation potential of zinc anode decreases and that of copper increases.
Answer» If both assertion and REASON are TRUE, and reason is the true EXPLANATION of the assertion if both assertion and reason are true, but reason is not the true explanation of the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :R is the correct explanation of A.

Discussion

17.	Assertion : The covalence of nitrogen in N_(2)O_(5) is 5 Reason : Nitrogen can expand its covalence beyond 4.
Answer» If both assertion and REASON are true and reason is the correct EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :Structure of `N_(2)O_(5)` is Hence, it forms 4 covalent bonds with oxygen. It cannotexpand its covalence beyond 4 DUE to the non-availabilityof d-orbital.

Discussion

18.	Assertion : The covalency of carbon is four in excited state. Reason : The four half-filled pure orbitals of carbon form same kind of bonds with an atom as those are with hybridised orbitals.
Answer» If ASSERTION is true but the REASON is FALSE If assertion is false but reason is true IF both assertion and reason are true and the reason is the correct explanation of assertion If both assertion and reason are true but reason is not the correct explanation of assertion Answer :A

Discussion

19.	Assertion : The correct order of increasing molecular forces in the given polymres is : Buna-S, Polythene, Nylon -6,6 Reason : The properties of polymers depends upon the molecular forces.
Answer» If both assertion and reason are TRUEAND reason is the correct explanationof assertion . If both assertion and reason are TRUE but reason is not the correct explanationof assertion . If assertion is true but reason is false. If both assertion and reason are false. Solution :Elastomers ( buna-S) have weakest intermolecularforces . FIBRES ( nylon -6,6) have strong INTERMOLECULAR forces.Thermoplastic polymers ( POLYTHENE ) have intermolecular forces intermediate between elastomers and fibres.

Discussion

20.	Assertion: The coordination entity of the type [PtCl_2(en)_2]^(+2)shows geometrical isomerism. Reason:Trans isomer of [PtCl_2 (en)_2]^(+2)shows optical activity.
Answer» Both Assertion & Reason are true ,Reason is the CORRECT explanation of Assertion Both Assertion & Reason are true, Reason is not correct explanation of Assertion Assertion is true , Reason is false Assertion is false , Reason is false Answer :C

Discussion

21.	Assertion. The conversion of fresh precipitate to colloidal state is called peptization. Reason. It is caused by addition of common ions.
Answer» If both assertion and reason are ture, and reason is the trure explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason false. Solution :CORRECT explanation. It is caused by adsorption of common IONS on the SURFACE of the precipitate RESULTING into repulsion and fragmentation.

Discussion

22.	Assertion : The compounds of noblegas element neon are not known. Reason : Neon does not have any vacant orbital in the valence shell of its atom.
Answer» If both ASSERTION and REASON are CORRECT and reason is correct EXPLANATION for assertion. If both assertion and reason are correct but reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. If both assertion and reason are incorrect. Solution :Reason is the correct explanation for assertion.

Discussion

23.	Assertion. The complex [Co(NH_(3))_(3)Cl_(3)] does not give precipitate with AgNO_(3). Reason. The given complex does not contain counter ions.
Answer» If both ASSERTION and REASON are true, but reason is not the true explanation of the assertion If both assertion and reason are true, but reason is not the true explanation of the assertion If assertionis true, but reason is false If both assertion and reason are false Solution :R is the correct explanation of A (The complex is non-ionic and does not contain ionizable `CL^(-)` IONS).

Discussion

24.	Assertion: The complex CoCl_3. 6NH_3 gives white precipitate with silver nitrate solution. Reason: chlorine is present Outside co-ordination sphere of the complexCoCl_3 . 6 NH_3.
Answer» Both ASSERTION & Reason are true ,Reason is the CORRECT explanation of Assertion Both Assertion & Reason are true, Reason is not correct explanation of Assertion Assertion is true , Reason is FALSE Assertion is false , Reason is false Answer :A

Discussion

25.	Assertion: The cell potential of mercury cell is 1.35V which remains constant. Reason: In mercury cell, the electrolyte is a paste of KOH and ZnO.
Answer» if both assertion and reason are true and the reason is the correct explanation of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is false If the assertion and reason both are false. Solution :`Zn_((s))+Cu_((aq))^(2+)toZn_((aq))^(2+)+Cu_((s))` As the TIME passes, the concentration of `Zn^(2+)` keeps on increasing while the concentration of `Cu^(2+)` keeps on decreasing. At the same time voltage of the cell keeps on decreasing. When there is no CHANGE in concentration of `Cu^(2+) and Zn^(2+)` IONS, VOLTMETER gives zero reading and this state is known as equilibrium.

Discussion

26.	Assertion: The cell potential of mercury cell is 1.35 V which remains constant. Reason: In mercury cell, the electrolyte is a paste of KOH and HgO.
Answer» If both assertion and reason are true, and reason is the true explanation of the assertion if both assertion and reason are true, but reason is not the true explanation of the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :Correct explanation. The cell REACTION, `Zn+HgOtoZnO+Hg` does not INVOLVE any ION whose concentration MAY change (`OH^(-)` ions consumed in one half reaction are produced in the second half reaction).

Discussion

27.	Assertion. The catalytic convertor in the car's exhaust system converts pollutin exhaust gases into nontoxic gases. Reason. Catalytic convertor contains a mixture of transition metals and their oxisde embedded in the inner support.
Answer» If both assertion and reason are ture, and reason is the trure EXPLANATION of the assertion. If both assertion and reason are TRUE, but reason is not the true explanation of the assertion. If assertion is true, but reason is FALSE. If both assertion and reason false. SOLUTION :R is the correct explanation of A.

Discussion

28.	Assertion: The catalytic converted in the car's exhaust system converts polluting exhaust gases into non-toxic gases.
Answer» If both assertion and Reason are TRUE and the Reason is the correct explanation of the assertion. If both assertion and Reason are true but the reason is not the correct explanation of the assertion If assertion is true but reason is false If both assertion and reason are false. Solution :A MIXTURE of transition metals annd their oxides is embedded in the inner supports of catalytic CONVERTER. Because of which catalytic converter converts polluting EXHAUST gases into non-toxic gases.

Discussion

29.	Assertion: The bond energy of gt C = O is less than gt C = C lt in alkenes. Reason: The carbon atom in carbonyl group is sp^(2) hybridised.
Answer» If both assertion and reason are true and the reason is the correct EXPLANATION of the assertion If both assertion and reason are true but reason is not the correct explanation of the assertion If assertion is true but reason is false If assertion is false but reason is true Solution :The bond energy of carbonyl GROUP is `179 Kcal mol^(-1)` and in `C=C` the bond energy is `145.8` Kcal. The carbonyl group shows resonance and thus POSSESSES higher bond energy. `C = O harr C^(+) -O^(-)`

Discussion

30.	Assertion : The boiling points of given compounds follow the order : CH_(3)CH_(2)CH_(2)CHO ~~CH_(3)CH_(2)CH_(2)CH_(2)CH_(3) lt CH_(3)CH_(2)CH_(2)CH_(2)OH ~~ H_(5)C_(2)OC_(2)H_(5) Reason : Boiling point dependsupon molecualr mass only.
Answer» If both assertion and REASON are true and reason is the correct explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :The correct order is : `CH_(3)CH_(2)CH_(2)CH_(2)CH_(3) LT H_(5)C_(2)OC_(2)H_(5) lt CH_(3)CH_(2)CH_(2)CHO lt CH_(3)CH_(2)CH_(2)CH_(2)OH` Boiling point depends upon the nature of intermolecular forces, stronger the forces, higher is the boiling point. `CH_(3)CH_(2)CH_(2)CH_(2)OH` moleculesare associated due to extensive intermolecular hydrogen bonding, `CH_(3)CH_(2)CH_(2)CHO` has stronger dipole-dipole ATTRACTIONS as compared to `H_(5)C_(2)OC_(2)H_(5) and CH_(3)CH_(2)CH_(2)CH_(2)CH_(3)` MOLECULES have onlyvan der Waals forces.

Discussion

31.	Assertion: The boiling points of alkyl chlorides, bromides and iodies are considerable higher thaan that of the hydrocarbon of comparable molecularr mass.
Answer» ASSERTION and reason both are correct and reason is correct explanation of assertion. Assertion and reason both are WRONG statements. Assertion is correct but reason is wrong statement. Assertion and reason both are correct statements but reason is not Solution :Correct explanation. For the same hydrocarbon part, the boiling points DECREASES as the ATOMIC mass off the halogen decreases.

Discussion

32.	Assertion: The boiling points of alkyl halides decrease in the order RI gt RBr gt RCl gt RF. Reason: The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.
Answer» Assertion and reason both are correct and reason is correct explanaion of assertion. Assertion and reason both are WRONG statements. Assertion is correct but reason is wrong statement. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Solution :Correct explanation: The boiling points of alkyl halides are DIRECTLY proportional to van der Waal's FORCES of attraction which in turn, depend UPON the molecular SIZE.

Discussion

33.	Assertion: The boiling point of alcohol is higher than those of hydrocarbons of comparable moleculal mass. Reason: Alcohol show intramolecular hydrogen banding
Answer» If both assertion and reasonare CORRECT and reason is the CORRECT EXPLANATION of the assertion If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion If assertion is CORRECT but reason is INCORRECT If assertion is INCORRECT but reason is CORRECT Answer :C

Discussion

34.	Assertion : The blueprecipitate formedby the action of K_(4)[Fe(CN)_(6)] on Fe^(3+) and by that of K_(2)[Fe(CN)_(6)] on Fe^(2+) have thesamecomposition Reasion : [Fe(CN)_(6)]^(3-)oxides Fe^(2+) to Fe^(3-) and itselfgetsreduced to [Fe(CN)_(6)]^(4-).
Answer» If both (A) and (B) are CORRECT and (R ) is the correct explqanation of (A) If both (A) and (B) are correct but (R ) is not the correct explqanation of (A) If (A) is correct ,but (R ) is INCORRECT If (A) is incorrect ,but (R ) is correct Answer :a

Discussion

35.	Assertion: The blueprecipitate formed by the action of K_(4)[Fe(CN)_(6)] on Fe^(3+) and by that of K_(3)[Fe(CN)_(6)] on Fe^(2+) have the same composition. Reason: [Fe(CN)_(6)]^(3-) oxidises Fe^(2+) to Fe^(3+) and itself gets reduced to [Fe(CN)_(6)]^(4-).
Answer» If assertion is true but the REASON is FALSE If assertion is false but reason is true If both assertion and reason are true and reason is the correct explanation of assertion If oth assertion and reason are true but reason is not the correct explanation of assertion Answer :C

Discussion

36.	Assertion : The binding energy per nucleon, for nuclei with atomic mass number A gt 100, decreases with A Reason :The nuclear forces are weak for heavier nuclei.
Answer» If both ASSERTION and reason are TRUE and the reason is the CORRECT EXPLANATION of the assertion If both assertion and reason are true but reason is not the correct explanantion of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :Nuclear FORCE is nearly same for all nucleus

Discussion

37.	Assertion : The basicity of hypophorus acid is two. Reason : Two hydrogen atoms are bonded to phosphorus atoms.
Answer» If both ASSERTION and REASON are CORRECT and reason is correct EXPLANATION for assertion. If both assertion and reason are correct but reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. If both assertion and reason are incorrect. Solution :Reason is the correct explanation for assertion.

Discussion

38.	Assertion :The atoms in acovalentmolecule are saidtoshare electrons, yet somecovalentmolecule are polar. Reason :In a polar covalent molecule , the sharedelectron spend moretimeon theaveragenear one of the atoms .
Answer» If assertion is true but the REASON is FALSE If assertion is false but reason is true IF both assertion and reason are true and the reason is the CORRECT explanation of assertion If both assertion and reason are true but reason is not the correct explanation of assertion Answer :C

Discussion

39.	Assertion : The -As=As- linkage present in arshphenamine( a Salvarsan drug ) resembles the -N=N- linkage present in azo days . Reason : The first antibacterial agent , prontosil resembles in structure to the compound salvarsan .
Answer» If both ASSERTION and reason are trueand reason is the CORRECT explanationof assertion . If both assertion and reason are true but reason is not the correct explanationof assertion . If assertion is true but reason is false. If both assertion and reason are false. ANSWER :B

Discussion

40.	Assertion: The alpha-hydrogen atom is carbonyl compounds is less acidic. Reason: The anion formed after the loss of alpha-hydrogen atom is resonance stabilised.
Answer» Assertion and reason both are correct and reason is correct explanation of assertion. Assertion and reason both are wrong statement. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Solution :Correct Assertion. The `ALPHA`-HYDROGEN atom in carbonyl compounds is ACIDIC.

Discussion

41.	Assertion : The archeological studies are based on the radioactive decay of carbon 14 isotope Reaosn :The ratio of C -14 " to " C -12 in the animals and plants is same as that in the atmosphere
Answer» If both ASSERTION and REASON are TRUE and the reason is the CORRECT explanation of the assertion If both assertion and reason are true but reason is not the correct explanantion of the assertion If assertion is true but reason is false If the assertion and reason both are false Answer :A

Discussion

42.	Assertion The anode is refeeredto as an oxidation electrode while the cathode is referred to as reduction electrode. Reason When an electric current is passed through a molten electrolyte, the anions move to the anode where they lose electrons and the cations move to the cathode where they gain electrons.
Answer» Both A and R are TRUE and R is the CORRECT EXPLANATION of A Both A and R are true but R is not a correct explanation of A A is true but R is false Both A and R arefalse. Answer :A

Discussion

43.	Assertion :The addition of ammonia derivatives to carbonyl compounds is carried in weakly acidic medium. Reason :In weakly acidic medium attacking nucleophile is also protonated.
Answer» If both ASSERTION and reason are correct and reason is correct EXPLANATION for assertion. If both assertion and reason are correct and reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. If assertion as well as reason are both incorrect. Solution :Correct reason. Attacking nucleophile is not protonated in WEAKLY acidic MEDIUM.

Discussion

44.	Assertion : The activity of 1 g pure uranium -235 will be greater than the same amount present as U_(3)O_(8) Reaosn : In the combined state, the activity of the radioactive element decreases
Answer» If both assertion and REASON are true and the reason is the correct explanation of the assertion If both assertion and reason are true but reason is not the correct explanantion of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :Radioactivity of an ELEMENT is independent of its physical state its chemical environment or temperature, suggesting that it is a PROPERTY of nucleus i.e., nuclear PHENOMENON.

Discussion

45.	Assertion : The activiation energies for fusion reactions are very low. Reaosn : They require very low temperature to overcome electrostatic repulsion between the nuclei.
Answer» If both assertion and reason are true and the reason is the CORRECT EXPLANATION of the assertion If both assertion and reason are true but reason is not the correct explanantion of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :The activation energies for fusion REACTIONS are very high. They require very high temperature `(gt 10^(6))` to over COME electrostatic repulsion between the nuclie

Discussion

46.	Assertion: Tetrahedral complexes with chiral structure exhibit optical isomerism. Reason: They lack plane of symmetry.
Answer» If assertion is TRUE but the REASON is false If assertion is false but reason is true If both assertion and reason are true and the reason is the CORRECT explanation of assertion If both assertion and reason are true but reason is not the correct explanation of assertion Answer :C

Discussion

47.	Assertion : Tetrahedral complexes having two different types of unidentate ligands coordinated with central metal ion will show geometrical isomerism . Reason : Geometrical isomerism arises in homoleptic complexes due to different possible geometric arrangement of the ligands .
Answer» If both ASSERTION and REASON are true and reason is the correct explanation of assertion If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false Solution :TETRAHEDRAL complexes do not SHOW geometrical isomerism because relative POSITIONS of the unidentate ligands attached to the central metal atom are same with respect to each other . This type of isomerism arises in heteroleptic complexes.

Discussion

48.	Assertion. Tetracycline is bacteriostatic antibiotic. Reason. It inhibits the growth of organisms.
Answer» If both ASSERTION and REASON are TRUE, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false If both assertion and reason are false. Answer :A

Discussion

49.	Assertion: tert-Butyl methyl ether on treatment with HI at 373K gives a mixture of methyl iodide and tert-butyl alcohol. Reason: The reaction occurs by S_(N)2 mechanism.
Answer» If both ASSERTION and reason are true, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation o the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :Correct assertion. Tert-Butyl METHYL ether on treatment with HI at 373K GIES tert-butyl iodide and methyl alcohol. Correct reason. The reaction OCCURS by `S_(N)1` mechanism.

Discussion

50.	Assertion: tert-Butyl chloride on treatment with sodium metal in dry ether gives 2,2,3,3-tetramethylbutane. Reason: tert-Alkyl halides readily undergo Wurtz reaction.
Answer» If both assertionn and reason are true, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and Reason are false. Solution :Correct assertion. Tert-Butyl CHLORIDE on treatment with NA metal gives isobutane and isobutylene. Correct reason. Tert-Alkyl halides do not UNDERGO Wurtz REACTION but INSTEAD undergo dehydrohalogenation.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion: The first ionisation energy of Be is greater than that of B. Reason: 2p-orbital is lower in energy than 2s-orbital.

Assertion: The equlibrium constant is fixed and is the charcteristic of any given chameical reaction as a specified temperaturee. Reason: The composition of the final equlibriu mixture at a particular temperaturee depends upon the starting amount of reactants.

Assertion : The enthalpy of reaction remains constant in the presence of catalyst. Reason : A catalyst participating in the reaction forms different activated complex and lowers down the activation energy of reactant and product remains the same.

Assertion : The enthalpy of reaction remains constant in the presence of a catalyst. Reason : A catalyst participating in the reaction forms different activated complex and lowers down the activation energy but the difference in energy of reactant and product remains the same.

Assertion : The enthalpy of formation of gaseous oxygen molecules at 298 K and under pressure of 1 atm is zero.Reason : The entropy of formation of gaseous oxygen molecules under the same condition is zero.

Assertion : The enthalpies of neutralisation of strong acids and strong bases are always same. Reason : Neutralization is heat of formation of water.

Assertion: The emf of a cell is related with equilibrium constant of the cell reaction as E_(cell)=(0.0591)/(n)log" "K. Reason: As E_(cell) changes with concentration of the electrodes, K of cell reaction also changes with concentration.

Assertion: The electron gain enthalpy of N is +ve while that of P is -ve. Reason: Smaller atomic size of N is which there is a considerable electron-electron repulsion and hence the additional electron is not accepted easily.

Assertion: The electrolysis of auqueous NaCl solution gives hydrogen at the cathode and chlorine at the anode. Reason: Chlorine has higher oxidation potential than water.

Assertion : The electrolysis of aqueous NaCl gives hydrogen at the cathode and chlorine at the anode Reason : Chlorine has higher oxidation potential than water

Assertion: The dissolution of ammonia in water does not follow henry's law. Reason: Ammonia undergoes ionisation in watrer as NH_(3)+H_(2)O hArr NH_(4)^(+)+OH^(-)

Assertion : The dissociation ofacetic acid decreases on addition of sodium acetate. Reason : It is due to common ion effect.

Assertion : The dissociation of acetic acid decreases on addition of sodium acetate. Reason : It is due to common ion effect.

Assertion : The Daniell cell becomes dead after sometime. Reason : Reduction potential of Zinc increases while that of copper decreases.

Assertion. The depression in freezing point depend on the amount of the solute dissolved and not one the nature of the solute or solvent. Reason. K_(f) for both has different values.

Assertion: The Daniell cell becomes dead after some time. Reason: Oxidation potential of zinc anode decreases and that of copper increases.

Assertion : The covalence of nitrogen in N_(2)O_(5) is 5 Reason : Nitrogen can expand its covalence beyond 4.

Assertion : The covalency of carbon is four in excited state. Reason : The four half-filled pure orbitals of carbon form same kind of bonds with an atom as those are with hybridised orbitals.

Assertion : The correct order of increasing molecular forces in the given polymres is : Buna-S, Polythene, Nylon -6,6 Reason : The properties of polymers depends upon the molecular forces.

Assertion: The coordination entity of the type [PtCl_2(en)_2]^(+2)shows geometrical isomerism. Reason:Trans isomer of [PtCl_2 (en)_2]^(+2)shows optical activity.

Assertion. The conversion of fresh precipitate to colloidal state is called peptization. Reason. It is caused by addition of common ions.

Assertion : The compounds of noblegas element neon are not known. Reason : Neon does not have any vacant orbital in the valence shell of its atom.

Assertion. The complex [Co(NH_(3))_(3)Cl_(3)] does not give precipitate with AgNO_(3). Reason. The given complex does not contain counter ions.

Assertion: The complex CoCl_3. 6NH_3 gives white precipitate with silver nitrate solution. Reason: chlorine is present Outside co-ordination sphere of the complexCoCl_3 . 6 NH_3.

Assertion: The cell potential of mercury cell is 1.35V which remains constant. Reason: In mercury cell, the electrolyte is a paste of KOH and ZnO.

Assertion: The cell potential of mercury cell is 1.35 V which remains constant. Reason: In mercury cell, the electrolyte is a paste of KOH and HgO.

Assertion. The catalytic convertor in the car's exhaust system converts pollutin exhaust gases into nontoxic gases. Reason. Catalytic convertor contains a mixture of transition metals and their oxisde embedded in the inner support.

Assertion: The catalytic converted in the car's exhaust system converts polluting exhaust gases into non-toxic gases.

Assertion: The bond energy of gt C = O is less than gt C = C lt in alkenes. Reason: The carbon atom in carbonyl group is sp^(2) hybridised.

Assertion : The boiling points of given compounds follow the order : CH_(3)CH_(2)CH_(2)CHO ~~CH_(3)CH_(2)CH_(2)CH_(2)CH_(3) lt CH_(3)CH_(2)CH_(2)CH_(2)OH ~~ H_(5)C_(2)OC_(2)H_(5) Reason : Boiling point dependsupon molecualr mass only.

Assertion: The boiling points of alkyl chlorides, bromides and iodies are considerable higher thaan that of the hydrocarbon of comparable molecularr mass.

Assertion: The boiling points of alkyl halides decrease in the order RI gt RBr gt RCl gt RF. Reason: The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.

Assertion: The boiling point of alcohol is higher than those of hydrocarbons of comparable moleculal mass. Reason: Alcohol show intramolecular hydrogen banding

Assertion : The blueprecipitate formedby the action of K_(4)[Fe(CN)_(6)] on Fe^(3+) and by that of K_(2)[Fe(CN)_(6)] on Fe^(2+) have thesamecomposition Reasion : [Fe(CN)_(6)]^(3-)oxides Fe^(2+) to Fe^(3-) and itselfgetsreduced to [Fe(CN)_(6)]^(4-).

Assertion: The blueprecipitate formed by the action of K_(4)[Fe(CN)_(6)] on Fe^(3+) and by that of K_(3)[Fe(CN)_(6)] on Fe^(2+) have the same composition. Reason: [Fe(CN)_(6)]^(3-) oxidises Fe^(2+) to Fe^(3+) and itself gets reduced to [Fe(CN)_(6)]^(4-).

Assertion : The binding energy per nucleon, for nuclei with atomic mass number A gt 100, decreases with A Reason :The nuclear forces are weak for heavier nuclei.

Assertion : The basicity of hypophorus acid is two. Reason : Two hydrogen atoms are bonded to phosphorus atoms.

Assertion :The atoms in acovalentmolecule are saidtoshare electrons, yet somecovalentmolecule are polar. Reason :In a polar covalent molecule , the sharedelectron spend moretimeon theaveragenear one of the atoms .

Assertion : The -As=As- linkage present in arshphenamine( a Salvarsan drug ) resembles the -N=N- linkage present in azo days . Reason : The first antibacterial agent , prontosil resembles in structure to the compound salvarsan .

Assertion: The alpha-hydrogen atom is carbonyl compounds is less acidic. Reason: The anion formed after the loss of alpha-hydrogen atom is resonance stabilised.

Assertion : The archeological studies are based on the radioactive decay of carbon 14 isotope Reaosn :The ratio of C -14 " to " C -12 in the animals and plants is same as that in the atmosphere

Assertion :The addition of ammonia derivatives to carbonyl compounds is carried in weakly acidic medium. Reason :In weakly acidic medium attacking nucleophile is also protonated.

Assertion : The activity of 1 g pure uranium -235 will be greater than the same amount present as U_(3)O_(8) Reaosn : In the combined state, the activity of the radioactive element decreases

Assertion : The activiation energies for fusion reactions are very low. Reaosn : They require very low temperature to overcome electrostatic repulsion between the nuclei.

Assertion: Tetrahedral complexes with chiral structure exhibit optical isomerism. Reason: They lack plane of symmetry.

Assertion : Tetrahedral complexes having two different types of unidentate ligands coordinated with central metal ion will show geometrical isomerism . Reason : Geometrical isomerism arises in homoleptic complexes due to different possible geometric arrangement of the ligands .

Assertion. Tetracycline is bacteriostatic antibiotic. Reason. It inhibits the growth of organisms.

Assertion: tert-Butyl methyl ether on treatment with HI at 373K gives a mixture of methyl iodide and tert-butyl alcohol. Reason: The reaction occurs by S_(N)2 mechanism.

Assertion: tert-Butyl chloride on treatment with sodium metal in dry ether gives 2,2,3,3-tetramethylbutane. Reason: tert-Alkyl halides readily undergo Wurtz reaction.

Assertion : The boiling points of given compounds follow the order : CH_(3)CH_(2)CH_(2)CHO CH_(3)CH_(2)CH_(2)CH_(2)CH_(3) lt CH_(3)CH_(2)CH_(2)CH_(2)OH H_(5)C_(2)OC_(2)H_(5) Reason : Boiling point dependsupon molecualr mass only.