94420 + Interview Questions in Chemistry in Class 12

1.	Assertion: CO_(2) is a gas while SiO_(2) is a solid at room temperature . Reason: CO_(2) is a covalent compound and SiO_(2) is an ionic solid.
Answer» Both A and R are true and R is the CORRECT explanatoin of A both A and R are true but R is the correct explanation of A A is true but R is false A is false but R is true Solution :Reason: `CO_(2)` is a covalent COMPOUND and `SiO_(2)` is a covalent NETWORK solid.

Discussion

2.	Assertion:Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components or less than both the components. Reason:The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixture.
Answer» Both ASSERTION and Reason are true and Reason is the CORRECT explanation of Assertion Both Assertion and Reason are true and Reason is not the correct explanation of Assertion Assertion is true but Reason is FALSE Both Assertion and Reason are false Answer :B

Discussion

3.	Assertion : CO and CN^(-) are referred as p acid L ligands. Reason : In CO and CN^(-) vacant p type orbitals are present.
Answer» <P>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 Solution :The ligands having vacant p-type orbitals have a tendency to recieve BACK donated p-electrons, THUS these are called p-acid ligands or p-acceptor ligands, e.g., CO and NO have lone pair as well as porp -orbitals which take part in the formation of p*-bond with CENTRAL metal atom as observed in case of CARBONYLS.

Discussion

4.	Assertion: [ClCl_(3)(NH_(3))_(3)] does not give white precipitate with AgNO_(3) solution. Reason: [CoCl_(3)(NH_(3))_(3)] complex is optically inactive.
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 :D

Discussion

5.	Assertion : Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components or less than both the components. Reason : The composition of thevapour phase is same as that of the liquid phase of azeotropic mixture.
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 :Non-ideal solutions with positive deviation i.e., having more VAPOUR pressure than expected, BOIL at LOWER temperature while those with negative deviation boil at HIGHER temperature than those of the COMPONENTS.

Discussion

6.	Assertion : Clothes washed with soap using hard water do not absorb dyes evenly. Reason : Hard water contains calcium and magnesium ions.
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 :Calcium and magnesium ions FORM INSOLUBLE calcium and magnesium soaps whichadheres on to the fibre of the CLOTH as GUMMY mass and hence dye does not get absorbed evenly.

Discussion

7.	Assertion : Azeotropic mixtures are formed only by non-ideal solution and they may have boiling points either greater than both the components or lesser than both the components. Reason : The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixtures.
Answer» If both the assertion and REASON are true and reason is a true explanation of the assertion. If both the 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 :Fact

Discussion

8.	Assertion : Azeotropic mixtures are formed only by non - ideal solutions and they may have boiling points either greater than both the components or less than both the compontents. Reason : The c omposition of the vapour phase is same as that of the liquid phase of an azeotropic mixture.
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. Answer :B

Discussion

9.	Assertion : Cl_(2) on reaction with NaOH (cold and dilute ) gives NaClO_(3) Reason : Cl_(2) get oxidised only in this reaction .
Answer» Both ASSERTION and reason are true and reason is the correct EXPLANATION of the assertion Both assertion and reason are true and reason is not the correct explanation of the assertion. Assertion is true but reason is false Both assertion and reason are false. Answer :A::B::D

Discussion

10.	Assertion. Azeotropic mixtures are fomed only by non-ideal solutions and they may have boiling points either greater than or less than both the components. Reason. The composition of the vapour phase is same as that of liquid phase of the azeotropic mixture.
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 boiling point of the azeotropic MIXTURE may be greater or less depending upon whether solution SHOWS NEGATIVE or positive deviation from Raoult's LAW.

Discussion

11.	Assertion : Chromatography in general involves a mobile (a gas, a liquid or a supercritical fluid) and a stationary phase (like Al_(2)O_(3) column). Reason : A component which is less soluble in stationary phase takes longer time to travel through it than the component which is more soluble in stationary phase.
Answer» If both assertion and reason are true and reason is the correct explanation of assertion . IFBOTH 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 :A component which is quite soluble in the sationary phase, TAKES longer time to TRAVEL through it than a component which is not very soluble in the STATIONARY phase but very soluble in the MOBILE phase.

Discussion

12.	Assertion. Average life of a radioactive element is that period in which 63% of it is decayed. Reason. Average life tau=1.44" t"_(1//2).
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 :The correct explanation to assertion is that quantity of radioactive substance DECAYED during its AVERAGE life is calculated by USING the expression `lambda = (0.693)/(t_(1//2)) = (2.303)/(1.44 t_(1//2))` log `(100)/(N_(t))`.

Discussion

13.	Assertion. Average atomic mass of an element depends mainly on the heavier isotope. Reason. Average atomic mass is obtained by multiplying the atomic mass of the heavier isotops with its fractional abundance.
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 assetion. If assertion is true, but reason if false If both assertion and reason are false. Solution :Correct A. Average atomic mass depends upon the atomic MASSES of different isotopes and their FRACTIONAL abundances. Correct R. It is obtained by MULTIPLYING atomic masses of the isotopes with their corresponding fractional abundances and then adding.

Discussion

14.	Assertion. Cinnabar is a chemical compound whereas brass is a mixture. Reason. Cinnabar always contains 6.25 times as much mercury as sulphur by weight. Brass can be made with widely different ratios of copper and zinc.
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 assetion. If assertion is true, but reason if false If both assertion and reason are false. Answer :A

Discussion

15.	Assertion: Auric chloride (AuCl_(3)) solution cannot be stored in a vessel made of copper, iron nickel, chromium, zinc or tin. Reason: Gold is a very precious metal.
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 :Gold has HIGHER reduction POTENTIAL that the given metals. Hence `AuCl_(3)` will REACT with these metals.

Discussion

16.	Assertion. Aufbau rule is violated in writing electronic configuration of Pd. Reason. Pd shows diamagnetic nature.
Answer» Solution :PD has `4d^(10)5s^(0)` CONFIGURATION rather than `4d^(8) 5s^(2)` configurationand hence is diamagnetic in nature.

Discussion

17.	Assertion : Cis-1, 3-dihydroxyl cyclohexane exists in boat conformation. Reason : In the chair form, there will not be hydrogen bonding between the two hydroxyl groups.
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 and the 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 :Here both assertion and reason are incorrect because cis-1, 3-dihydroxy cyclohexane EXIST in chair conformation and in chair conformation hydrogen bonding is present.

Discussion

18.	Assertion: ATP molecules are energy rich molecules. Reason: ATP consists of a purine base adenine, pentose sugar ribose and a string of three phosphate groups.
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 corret explanation of the assertion. If assertion is true but reason is false. If the assertion and the reason both are false. Solution :ATP has four negativity charged oxygen atoms very close to each other. So the repulsive forces between them is high. On HYDROLYSIS of ATP, a `H_(2)PO_(4)^(-)` ion is eliminated and the number of negatively charged oxygen atoms decreases. Thus, repulsive forces decreases and a large amount of energy is set FREE. when ATP change to ADP,which in turn changes into AMP, energy is released at each step. this how ATP can act as a source of energy.

Discussion

19.	Assertion: Chlorophyll is a magnesium corrin complex Reason :Chlorophyll is not useful to perform photosynthesis in plants
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 :D

Discussion

20.	Assertion : Atomicity of oxygen is 2. Reason : 1 mole of an element contains 6.023xx10^(23) atoms.
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 :No. of ATOMS present in a molecules of a GASEOUS element is called atomicity. For EXAMPLE, `O_(2)` has two atoms and hence its atomicity is 2.

Discussion

21.	Assertion: Chloroform is generally stored in dark coloured bottles filled to the brim. Reason: Chloroform reacts with glass in the presence of sun light..
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 :Correct reason. CHLOROFORM is oxidised to a poisonous gas phosgene in the presence of SUN light and traces of oxygen.

Discussion

22.	Assertion: Chlorination of ethyl benzene with with Cl_(2) in the presence of heat and light mainly yields 1-chloro-2-phenylethane. Reason: The reaction occurs through the formation of C_(6)H_(5)CH_(2)overset(**)(C)H_(2) intermediate.
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 :Correct assertion. Chlorination of ethyl benzene with `Cl_(2)` in the presence of heat and light gives 1-chloro-1-phenylethane. Correct reason. The REACTION OCCURS through the formation of benzylic INTERMEDIATE `(C_(6)H_(5)overset(**)(C)HCH_(3))`.

Discussion

23.	Assertion: Chloral reacts with phenyl chloride to form DDT. Reason: It is an electrophilic substition 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. Answer :A

Discussion

24.	Assertion: Atomic size of sivler is almost equal to that of gold. Reason: d-subshell has low penetration power and produce poor shielding.
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 :ATOMIC size of SILVER is almost EQUAL to that of gold DUE to lathanide contraction.

Discussion

25.	Assertion : Chemistry of Actinides is more complicated than Lanthanoids. Reason : Actinides elements are radioactive.
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 a correct explanation of the assertion Ifassertion is true but reason is false If the assertion and reason both are false Solution :Both assertion and reason are true but reason is not the correct explanation of assertion. Actinides are more COMPLICATED DUE to the possibility of large number oxidation states.

Discussion

26.	Assertion : Chemicals added to foods for increasing their shelf life are called preservatives. Reason : Natural sweetners like sucrose and artificial sweetners like saccharin are commonly used as food preservatives.
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 :Sweetenersare added to impart swwetness to the food. SODIUM benzoate , table SALT, vegetable oilsetc.Are some commonlyusedpreservatives .

Discussion

27.	Assertion : Atomic number of the element ununbium is 112. Reason : Name for digits 1 and 2 is un-and bi-respectively in latin words.
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 a correct explanation of the assertion Ifassertion is true but reason is false If the assertion and reason both are false Solution :Both assertion and reason are true and reason is the correct explanation of assertion.

Discussion

28.	Assertion : Chemical messengersare received at the binding sites of receptor proteins. Reason : Chemical messengergives messages to the cell without entering the cell.
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 :A

Discussion

29.	Assertion. Atomic mass of sodium is 23 u. Reason. An atom of sodium is 23 times heavier than an atom of carbon-12 isotope.
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 assetion. If assertion is true, but reason if false If both assertion and reason are false. Solution :Correct R. An atom of SODIUM is 23 TIMES heavier than `(1)/(12)TH` of the mass of an atom of carbon - 12 isotope.

Discussion

30.	Assertion : Chemical messengers are chemicals that enable communication of message between two neurons or between neurons and muscles Reason: Chemicals enter the cell through receptor
Answer» Assertion and reason both are correct statement but reason does not explain assertion Assertion and reason both are correct and reason explains the assertion Both assertion and reason are wrong statement Assertion is correct statement reason is wrong statement Solution :Correct reason. CHEMICALS bind to the RECEPTORS sites present on the surface of the membrane or the cell.

Discussion

31.	Assertion [A]:The enthalpy of reaction remain constant in the presence of a catalyst.Reason [R]: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» <P>Both assertion [A] and reason [R] are correct and the reason [R] is correct EXPLANATION of assertion [A]. Both assertion [A] and reason [R] are correct but reason [R] does not explain assertion [A] Assertion [A] is correct but reason [R] is correct Assertion [A] is incrorrect but reason [R] is correct. Solution :The processe.s enthalpy `DELTAH` is different THENTHE enthalpy of `H_(R)` and `H_(P)`. `DeltaH=(H_(p)-H_(R))` In the presence of the catalysts the energy of the reactant and the power of energy (Enthalpy)does not change.Catalysts and REACTORS change the way of the process of making new active complexes reduce activation energy.

Discussion

32.	Assertion : Chemical messenger gives message to the cell without entering the cell. Reason: Chemical messenger is received at the binding site of receptor proteins
Answer» ASSERTION and REASON both are CORRECT statement but reason does not EXPLAIN assertion Assertion and reason both are correct and reason explains the assertion Both assertion and reason are wrong statement Assertion is correct statement reason is wrong statement Solution :Reason is the correct EXPLANATION of the assertion.

Discussion

33.	Assertion: At the same temperature water has higher vapour pressure than acetic acid. Reason :Hydrogen bonding in water is weaker than in acetic acid.
Answer» Both Assertion and REASON are true and Reason is the correct EXPLANATION of Assertion Both Assertion and Reason are true and Reason is not the correct explanation of Assertion Assertion is true but Reason is false Both Assertion and Reason are false ANSWER :A

Discussion

34.	Assertion: CHCl_(3) is stored in transparent bottles. Reason: CHCl_(3) is oxidised in dark.
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 :`CHCl_(3)` is stored in dark BOTTLES to PREVENT oxidation of `CHCl_(3)` in presence of SUNLIGHT.

Discussion

35.	Assertion : CHCl_(3) is more acidic than CHF_(3). Reason : The conjugate base of CHCl_(3) is more stable than CHF_(3).
Answer» If both ASSERTION and reason are true and reason is the correct explanation of the assertion If both assertion and reason aretrue but reason is not the correct explanation is true but reason is false. If the assertion and reason both are false. If the assertion and reason both are false. Solution :The conjugate base of `CHCl_(3)` is more stable than conjugate base of `CHF_(3)(CF_(3))`. `C Cl_(3)` stabilized by -I EFFECT of CHLORINE atoms as well as by the ELECTRONS. But conjugate base of `CF_(3)` isis stabilized only by -I effect of flourine atoms. Here both assertion and reason are true and reason is correct explanation of assertion.

Discussion

36.	Assertion At same temperature if equal number of molecules is considered, O_(2) has greater fractions of molecules moving with most probable than CO_(2) Reason Most probable speed is inversely related to square root of molar mass.
Answer» ANSWER :d

Discussion

37.	Assertion. Change in colour of acidic solution of potassium dichromate by breath is used to test drunken drivers. Reason. Change in colour is due to the complexation of alcohol with potassiumdichromate.
Answer» SOLUTION :Correct R. Acidified `K_(2)Cr_(2)O_(7)`solution oxidizes alcohol and itselfis reduce to `Cr_(2)(SO_(4))_(3)` which is GREEN in colour.

Discussion

38.	Assertion: At high pressure, the compression factor Z is (1+(Pb)/(RT)) Reason : At high pressure vander Waals' equation is modified as P(V-b) = RT.
Answer» If both assertion and reason are true and the reason is 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 :Vander Waal's EQUATION is `(P+(a)/(V^(2)))(V-b)=RT` at high pressure`P(V-b)=RTimplies PV-PB=RT` `IMPLIES (PV)/(RT)=(1+(Pb)/(RT))` if `(PV)/(RT) = Z,` then`Z=(1+(Pb)/(RT))`.

Discussion

39.	Assertion :- At constant temp 0^(@)C and 1 atm, the change H_(2)O(s)rarr H_(2)O(l)Delta H and Delta E both are zero. Reason :- During isothermal process H and E both remains constant.
Answer» If both ASSERTION & Reason are TRUE & the Reason is a CORRECT EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are false. Answer :D

Discussion

40.	Assertion: Change in colour of acidic solution of potassium dichromate by breath is used to test drunk drivers. Reason: Change in colour is due to the complexation of alcohol with potassium dichromate.
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 :Change in colour is due to reduction of dichromate and orange RED dichromate changes to green COLOURED `Cr^(3+)`

Discussion

41.	Assertion. Aspirin can cause ulcer in the stomach. Reason. The ester group in aspirin gets hydrolysed to acid group in the stomach where the pH is 2.
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

42.	Assertion :CH_4 does not react with Cl_2 in dark Reason:Chlorination of CH_4 takes place in sunlight
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 butreason 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 assertion that chlorination of `CH_4` does not take place in dark is correct because it is a FREE radical REACTION and free RADICALS are obtained in presence of sunlight.

Discussion

43.	Assertion (A):Sulphide ores are concentrated by forth floatation process . Reason ®:Sulphide ores are preferentially wetted by oil can be separated from gangue.
Answer» A and R are CORRECT mR EXPLAIN A A and R are correct,R does not explains A A is correct but R is wrong A is wrong but R is correct Answer :a

Discussion

44.	Assertion: CH_(3)CHO reacts with NH_(3) to form urotropine. Reason: Urotropine is used as medicine in case of urinary troubles.
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 :`HCHO` reacts with `NH_(3)` to FORM urotropine `6HCHO+4NH_(3)RARR (CH_(2))_(6)N_(4)+6H_(2)O`

Discussion

45.	Assertion : (CH_(3))_(3)N geometry is pyramidal but in case (SiH_(3))_(3)N it is planar. Reason :The maximum covalency of Si is six but that of C is four.
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 and the reason is not the correct explanation of assertion Solution :In `(CH_(3))_(3)overset(..)(N), N` is `sp^(3)` hybridiazed pyramidal strucuture because of absence of VACANT orbital on carbon ATOM thereforeno BACKBONDING is possible In `(SiH_(3))_(3)N, N` is `sp^(2)` hybridized, on the basis of `ppi-dpi` back bonding `(SiH_(3))_(3)N` resulting into triangular planar structure. COVALENCY of both C and Si is four

Discussion

46.	Assertion: As a lead storage battery gets discharged, density of the electrolyte present in it decreases. Reason: lead and lead dioxide both react with sulphuric acid to form lead sulphate.
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 because sulphuric acid is consumed due to formation of LEAD SULPHATE and HENCE density decreases.

Discussion

47.	Assertion CH_(3)CH_(3)(CH_(3)) NCH_(2)CH_(2)CH_(3)on treatment with aqueous Hcl produces two stereo isomeric quaternary ammonium salts. Reason salts will have a chiral centre.
Answer» Both assertion and REASON are correct and reason is the correct EXPLANATION of the assertion. Both assertion and reason are correct and reason is the correct explanation of the assertion. Assertion is correct but reason is INCORRECT. Assertion is incorrect but RESON is correct. Answer :(a)

Discussion

48.	Assertion: As a lead storage battery gets discharged, density of electrolyte, present in it, decreases. Reason: lead and lead dioxide both react with sulphuric acid to form lead sulphate.
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 :Sulphate is CONSUMED from ELECTROLYTE due to formation of lead sulphate, thus, DENSITY decreases.

Discussion

49.	Assertion : (CH_(3))_(3)C COOH does not give HVZ reaction. Reason : (CH_(3))_(3)C COOH does not have alpha-hydrogen atom.
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. Answer :A

Discussion

50.	Assertion : (CH_3)_(3)COH when heated with conc. H_2SO_4 gives isobutylene as the main product and not di-tertiary butyl ether. Reason : All alcohols are radily dehyrated with conc. H_2SO_4
Answer» BothA and B are true and R is the correct explanation of A. A is true but R is FALSE. A is False but R is True. Both A and R are false. Solution :`(CH_3)_3overset(+)C` carbocation is quite stable and loses a`H^(+)` ION to FORM isobutylene as the product.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion: CO_(2) is a gas while SiO_(2) is a solid at room temperature . Reason: CO_(2) is a covalent compound and SiO_(2) is an ionic solid.

Assertion:Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components or less than both the components. Reason:The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixture.

Assertion : CO and CN^(-) are referred as p acid L ligands. Reason : In CO and CN^(-) vacant p type orbitals are present.

Assertion: [ClCl_(3)(NH_(3))_(3)] does not give white precipitate with AgNO_(3) solution. Reason: [CoCl_(3)(NH_(3))_(3)] complex is optically inactive.

Assertion : Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components or less than both the components. Reason : The composition of thevapour phase is same as that of the liquid phase of azeotropic mixture.

Assertion : Clothes washed with soap using hard water do not absorb dyes evenly. Reason : Hard water contains calcium and magnesium ions.

Assertion : Azeotropic mixtures are formed only by non-ideal solution and they may have boiling points either greater than both the components or lesser than both the components. Reason : The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixtures.

Assertion : Azeotropic mixtures are formed only by non - ideal solutions and they may have boiling points either greater than both the components or less than both the compontents. Reason : The c omposition of the vapour phase is same as that of the liquid phase of an azeotropic mixture.

Assertion : Cl_(2) on reaction with NaOH (cold and dilute ) gives NaClO_(3) Reason : Cl_(2) get oxidised only in this reaction .

Assertion. Azeotropic mixtures are fomed only by non-ideal solutions and they may have boiling points either greater than or less than both the components. Reason. The composition of the vapour phase is same as that of liquid phase of the azeotropic mixture.

Assertion. Average life of a radioactive element is that period in which 63% of it is decayed. Reason. Average life tau=1.44" t"_(1//2).

Assertion. Average atomic mass of an element depends mainly on the heavier isotope. Reason. Average atomic mass is obtained by multiplying the atomic mass of the heavier isotops with its fractional abundance.

Assertion. Cinnabar is a chemical compound whereas brass is a mixture. Reason. Cinnabar always contains 6.25 times as much mercury as sulphur by weight. Brass can be made with widely different ratios of copper and zinc.

Assertion: Auric chloride (AuCl_(3)) solution cannot be stored in a vessel made of copper, iron nickel, chromium, zinc or tin. Reason: Gold is a very precious metal.

Assertion. Aufbau rule is violated in writing electronic configuration of Pd. Reason. Pd shows diamagnetic nature.

Assertion : Cis-1, 3-dihydroxyl cyclohexane exists in boat conformation. Reason : In the chair form, there will not be hydrogen bonding between the two hydroxyl groups.

Assertion: ATP molecules are energy rich molecules. Reason: ATP consists of a purine base adenine, pentose sugar ribose and a string of three phosphate groups.

Assertion: Chlorophyll is a magnesium corrin complex Reason :Chlorophyll is not useful to perform photosynthesis in plants

Assertion : Atomicity of oxygen is 2. Reason : 1 mole of an element contains 6.023xx10^(23) atoms.

Assertion: Chloroform is generally stored in dark coloured bottles filled to the brim. Reason: Chloroform reacts with glass in the presence of sun light..

Assertion: Chlorination of ethyl benzene with with Cl_(2) in the presence of heat and light mainly yields 1-chloro-2-phenylethane. Reason: The reaction occurs through the formation of C_(6)H_(5)CH_(2)overset(**)(C)H_(2) intermediate.

Assertion: Chloral reacts with phenyl chloride to form DDT. Reason: It is an electrophilic substition reaction.

Assertion: Atomic size of sivler is almost equal to that of gold. Reason: d-subshell has low penetration power and produce poor shielding.

Assertion : Chemistry of Actinides is more complicated than Lanthanoids. Reason : Actinides elements are radioactive.

Assertion : Chemicals added to foods for increasing their shelf life are called preservatives. Reason : Natural sweetners like sucrose and artificial sweetners like saccharin are commonly used as food preservatives.

Assertion : Atomic number of the element ununbium is 112. Reason : Name for digits 1 and 2 is un-and bi-respectively in latin words.

Assertion : Chemical messengersare received at the binding sites of receptor proteins. Reason : Chemical messengergives messages to the cell without entering the cell.

Assertion. Atomic mass of sodium is 23 u. Reason. An atom of sodium is 23 times heavier than an atom of carbon-12 isotope.

Assertion : Chemical messengers are chemicals that enable communication of message between two neurons or between neurons and muscles Reason: Chemicals enter the cell through receptor

Assertion [A]:The enthalpy of reaction remain constant in the presence of a catalyst.Reason [R]: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 : Chemical messenger gives message to the cell without entering the cell. Reason: Chemical messenger is received at the binding site of receptor proteins

Assertion: At the same temperature water has higher vapour pressure than acetic acid. Reason :Hydrogen bonding in water is weaker than in acetic acid.

Assertion: CHCl_(3) is stored in transparent bottles. Reason: CHCl_(3) is oxidised in dark.

Assertion : CHCl_(3) is more acidic than CHF_(3). Reason : The conjugate base of CHCl_(3) is more stable than CHF_(3).

Assertion At same temperature if equal number of molecules is considered, O_(2) has greater fractions of molecules moving with most probable than CO_(2) Reason Most probable speed is inversely related to square root of molar mass.

Assertion. Change in colour of acidic solution of potassium dichromate by breath is used to test drunken drivers. Reason. Change in colour is due to the complexation of alcohol with potassiumdichromate.

Assertion: At high pressure, the compression factor Z is (1+(Pb)/(RT)) Reason : At high pressure vander Waals' equation is modified as P(V-b) = RT.

Assertion :- At constant temp 0^(@)C and 1 atm, the change H_(2)O(s)rarr H_(2)O(l)Delta H and Delta E both are zero. Reason :- During isothermal process H and E both remains constant.

Assertion: Change in colour of acidic solution of potassium dichromate by breath is used to test drunk drivers. Reason: Change in colour is due to the complexation of alcohol with potassium dichromate.

Assertion. Aspirin can cause ulcer in the stomach. Reason. The ester group in aspirin gets hydrolysed to acid group in the stomach where the pH is 2.

Assertion :CH_4 does not react with Cl_2 in dark Reason:Chlorination of CH_4 takes place in sunlight

Assertion (A):Sulphide ores are concentrated by forth floatation process . Reason ®:Sulphide ores are preferentially wetted by oil can be separated from gangue.

Assertion: CH_(3)CHO reacts with NH_(3) to form urotropine. Reason: Urotropine is used as medicine in case of urinary troubles.

Assertion : (CH_(3))_(3)N geometry is pyramidal but in case (SiH_(3))_(3)N it is planar. Reason :The maximum covalency of Si is six but that of C is four.

Assertion: As a lead storage battery gets discharged, density of the electrolyte present in it decreases. Reason: lead and lead dioxide both react with sulphuric acid to form lead sulphate.

Assertion CH_(3)CH_(3)(CH_(3)) NCH_(2)CH_(2)CH_(3)on treatment with aqueous Hcl produces two stereo isomeric quaternary ammonium salts. Reason salts will have a chiral centre.

Assertion: As a lead storage battery gets discharged, density of electrolyte, present in it, decreases. Reason: lead and lead dioxide both react with sulphuric acid to form lead sulphate.

Assertion : (CH_(3))_(3)C COOH does not give HVZ reaction. Reason : (CH_(3))_(3)C COOH does not have alpha-hydrogen atom.

Assertion : (CH_3)_(3)COH when heated with conc. H_2SO_4 gives isobutylene as the main product and not di-tertiary butyl ether. Reason : All alcohols are radily dehyrated with conc. H_2SO_4