94420 + Interview Questions in Chemistry in Class 12

1.	Assertion : Uracil occurs in DNA. Reason : RNAundergoes replication.
Answer» If both assertion and reason are true , and 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 ASSERATION is true , but reason is false. If both assertion and reason are false. SOLUTION :CORRECT assertion : URACIL occurs in RNA. Correct reason : RNA does not UNDERGO replication.

Discussion

2.	Assertion. Tungsten has very high melting point. Reason. Tunsten is a rare earth element.
Answer» Solution :CorrectR `//`explanation. W has LARGE number of unpaired ELECTRON . HENCE, metallic bondingin it is QUITE strong.

Discussion

3.	Assertion : Trichloro acetic acid is much stronger acid than acetic acid Reason : Acidity decreases with increasing number of electron withdrawing substituents.
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

4.	Assertion : Treatment of D-glucose with alkali affords an equilibrium , D-fructose and starting substance D-glucose, Reason: The reaction invovels an intermediate in which hybridization of C_(2) change from sp^(3) to sp^(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 truebut 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 Answer :A

Discussion

5.	Assertion : Treatment of chloroethane with saturated solution of AgCN give ethyl isocyanide as major product. Reason : Cyanide ion (CN^(-)) is an ambident nucleophile.
Answer» Both assertion and REASON are correct, and reason is the correct explanation of the assertion. Both assertion and reason are True, but reason is not the correct explanation of the assertion. Assertion is INCORRECT, but reason is correct Both assertion and reason are incorrect Answer :B

Discussion

6.	Assertion: Treatment of chloroethane with a saturated solution of AgCN gives ethyl isocyanide as the major product. Reason: Cyanide ion (: CN^(-)) is an ambident nucleophile.
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 explanation: AGCN being a covalent compound acts as a nucleophile through lone pair of electrons PRESENT on N to GIVE ethyl isocyanide.

Discussion

7.	Assertion : Trans[CoCl_2(en)_2]^(2+)is optically inactive. Reason: The coordination numbers of the complex is 6.
Answer» Both ASSERTION and reason are TRUE and the reason is the CORRECT explanation of the assetion Both the assertion and reason are true but the reason is not the correct explanation of the assertion. Assertion is true but reason is FALSE Both assertion and reason are false ANSWER :B

Discussion

8.	Assertion : Transparent soaps are made by dissolving soaps in ethanol Reason: Ethanol makes things invisible.
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. Ethanol REMOVES AIR and moisture which scatter LIGHT.

Discussion

9.	Assertion: Transition metal ion forming octahedral complexes undergo sp^(3)d^(2) or d^(2) sp^(3) hybridisation. Reason: Strong field ligands force the unpaired electrons of central metal ion to pair up causingg d^(2)sp^(3) hybridisation whereas weak field ligands do not affect electronic configuration of the metal ion undergoes in sp^(3)d^(2) hybridisation.
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

10.	Assertion. Trans [CoCl_(2)(en)_(2)]^(+) is optically inactive. Reason. Itis an octahedral complex.
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 :Correct explanation. Trans `[CoCl_(2)(en)_(2)]^(+)` has a PLANE of SYMMETRY.

Discussion

11.	Assertion : trans -2-Butene on reaction with Br_(2) gives meso-2,3-dibromobutane. Reason : The reaction involves syn-addition of bromine.
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 :The assertion that trans-2 BUTENE REACTS with `Br_(2)` to give product meso-2, 3-dibromobutane is correct but it does not involve syn-addition of `Br_(2)`.

Discussion

12.	Assertion: Traces of moisture from phenol cann be easily removed by distilling with sodium metal. Reason: Wate is more acidic than phenol.
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. Last traces of MOISTURE cannot be removed from phenol by DISTILLING it with SODIUM metal. Correct reason. Phenol being more acidic than water reacts with NA more readily than water.

Discussion

13.	Assertion (A) Toxic metal ions are removed by the chelating ligands. Reason (R) Chelate complexes tend to be more stable.
Answer» Both assertion and REASON are TRUE, and reason is the CORRECT explanation of the assertion. Both assertion and reason are True, but reason is not the correct explanation of the assertion Assertion is True, but reason is fasle. Bothassertion and reason are FALSE Answer :(a)

Discussion

14.	Assertion : Toxic metal ions are removed by the chelating ligands Reason : chelate Chelate complexes tend to be more stable.
Answer» ASSERTION and REASON both are true, reason both are true, reason is CORRECT explanation of assertion. Assertion and reason both are true but reason is not the correct explanation of assertion Assertion is true, reason is false Assertion is false, reason is true Answer :a

Discussion

15.	Assertion : Total number of octahedral voids present in unit cell of cubic close packing including the one that is present at the body centre, is four. Reason: Besides the body centre there is one octahedral void present at the centre of each of the six faces of the unit cell and each of which is shared between two adjacent unit cells.
Answer» Assertion and reason both are correct statement and reason is correct explanation for assertion. Assertion and reason both are correct STATEMENTS but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. SOLUTION :In cubic close packing structure, there are 12 octahedral voids located at centre of 12 edges and each edges are equally shared by 4 other unit cell and the void PRESENT at the BODY centre is not shared by any unit cell. Number of octahedral voids =`1 + (12 xx 1/4) = 4`.

Discussion

16.	Assertion : To obtain maximum work from a galvaniccell charge has to be passed reversibly. Reason: The reversible work done by a galvanic cell is equal to decrease in its Gibbs energy.
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 notthe correct explanation of assertion . If assertion is true but reason is FALSE . If both assertion and reason are false . Answer :A

Discussion

17.	Assertion:[Ti(H_2O)_6]^(3+) colourless Reason : d-dtransition is not possible since the central metal has d^(0) configuration.
Answer» Both ASSERTION and REASON are true and the reason is the correct explanation of the ASSETION Both the assertion and reason are true but the reason is not the correct explanation of the assertion. Assertion is true but reason is FALSE Both assertion and reason are false ANSWER :D

Discussion

18.	Assertion: [Ti(H_(2)O)_(6)]^(4+) is coloured while [Sc(H_(2)O)_(6)]^(3+) is colourless. Reason: d-d transition is not possible in [Sc(H_(2)O)_(6)]^(3+).
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 Solution :Both `[Ti(H_(2)O)_(6)]^(4+) and [Sc(H_(2)O)_(6)]^(3+)` are colourless, due to absence of free electrons in 3d subshell.

Discussion

19.	Assertion [Ti (H_(2)O)_(6)] Cl_(4) is colourless while [Sc (H_(2)O)_(6)] Cl_(3) is coloured. Reason d-d transition is not possible in [Ti (H_(2)O)_(6)] Cl_(4)
Answer» Both ASSERTION and REASON are correct and reason is the correct explanation of the assertion. Both assertion and reason are correct but reason is not the correct explantion Assertion is correct but reason is INCORRECT Assertion is incorrect but reason is correct Answer :D

Discussion

20.	Assertion : Ti can be purified by van arkel process Reason : TiI_(4) is a volatile compound which decomposes at a high temperature.
Answer» Both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A). Both (A) and (R ) are true and (R ) is not the correct explanation of (A). (A) true but (R ) false. Both (A) and (R ) are false. Answer :A

Discussion

21.	Assertion. Ti can bepurifiedby van Arkelprocess. Reason.TiI_ 4isavolatilecompoundwhichdecomposes ata hightemperature.
Answer» Ifbothassertionandreasonaretrue, ANDREASON is NOTTHE trueexplanationofthe ASSERTION. Ifbothassertionandreasonaretrue,butreasonis notthetrueexplanationoftheassertion. Ifassertionis TRUE,butreason isfalse If bothassertionandreasonarefalse ANSWER :A

Discussion

22.	Assertion : Thiophene present in commercial benzene as an impurity can be removed by shaking the mixture with cold concentrated H_(2)SO_(4). Reason : Thiophene is a heterocyclic aromatic compound.
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 RESON 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 :On SHAKING with CONCENTRATED `H_(2)SO_(4)` THIOPHENE being more reactive undergoes sulphonation and the thiophene- 2-sulphonic acid thus formed dissolves in concentrated `H_(2)SO_(4)`.

Discussion

23.	Assertion: Thionyl chloride reacts with straight chain primary alcohols without any rearrangement. Reason: SO_(2) escapes from the reaction mixture.
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 explanation: No CARBOCATION intermediate is formed in the SUBSTITUTION reaction.

Discussion

24.	Assertion : Thermoplastics become hard on heating and soft on cooling. Reason : Themoplastics are cross - linked polymers which are solublein many organic solvents.
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 :In THEMOPLASTICS, the polymer chains are held together by weak intermolecular forces of attrction. The applied heat and pressure can easily overcome the weak forces of attraction which HOLD the chains and the polymer becomes soft and flexible. On cooling, they become hard and rigid.

Discussion

25.	Assertion : There is no reaction known for which DeltaG is positive, yet it is spontaneous.Reason : For photochemical reactions DeltaG is negative
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 :PHOTO CHEMICAL REACTIONS have +ve`DeltaG`.

Discussion

26.	Assertion : Thermite mixture Fe_(2)O_(3)+ Al (powder) is used in the welding. Reason : Al is a good reductant.
Answer» If both ASSETION and reason are 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 :B

Discussion

27.	Assertion: The vapour pressure of mixture of ethanol and water is greater than pure water. Reason: Ethanol & water form 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

28.	Assertion : The values of colligative properties are of smaller order as compared to values shown by true solutions at same concentrations. Reason : Colloidal particles show Brownian movement .
Answer» If both assertion and reason are true and reasonis 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 :COLLOIDAL particles being bigger aggregates , the NUMBER of particles in a colloidal solution is comparatively SMALL as compared to a true solution.

Discussion

29.	Assertion : The valency and oxidationnumber of sulphur in S_(8) respectively are 2 and 0. Reason : S_(8) rhombic is the most stable allotropic form a sulphur.
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::C::D

Discussion

30.	Assertion :- The type of dentition in humans is called diphyodont. Reason :- A set of temoporary milkteeth is replaced by a set of permanent teeth in adult.
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 Assertiion. If Assertion is True but the Reason is False. If both Assertion & Reason are False Answer :A

Discussion

31.	Assertion: The two strands of DNA are complementary to each other Reason: Adenine specifically forms hydrogen bonds with guanine whereas cytosine forms hydrogen bonds with thymine.
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 :Adenine forms hydrogen bonds with thymine whereas cytosine forms hydrogen bonds with guanine . Due to SPECIFIC pairing of BASES the TWO strands are complementary.

Discussion

32.	Assertion: The total number of isomers shown by [Co(en)_2Cl_2]^(+) complex ion is three Reason: [Co(en)_2Cl_2]^(+)complex ion has an octahedral geometry.
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 :B

Discussion

33.	Assertion : The total number of atoms present in a simple cubic unit cell is one. Reason: Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent unit cells.
Answer» Assertion and REASON both are CORRECT STATEMENT and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Answer :A

Discussion

34.	Assertion: The time of vulcanisation and temperature is increased by adding accelerators. Reason: By vulcanising, a material of high tensile strength can be obtained
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 reason both are false Solution :The TIME of vulcanisaiton is redcuced by ADDING accelerators and activators.

Discussion

35.	Assertion: The third period contains only 8 electrons and not 18 like 4th period. Reason: In III perriod filling starts from 3s^(1) and complete at 3p^(6) whereas in IV period it starts from 4s^(1) annd complete after 3d^(10) and 4s^(2).
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

36.	Assertion: The spin only magnetic moment of [MnBr_4]^(2-)is 5.9 BM Reason:[MnBr_4]^(2-)is tetrahedral with sp^3 hybridisation of Mn^(2+) having 3d^5 configuration
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

37.	Assertion : The specific rotation of a freshly prepared solution of alpha-glucose decreases from + 112^(@) to 52.7^(@) while that of beta glucose increases from +19^(@) to 52.7^(@) . Reason: The change in specific rotation of an optically active compound with time to an equilibrium value is called mutarotation.
Answer» If both assertion and reason are true and the reason is the correct explanation of the assertion. If both assertion and reason are truebut 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 :Glucose EXISTS in two forms, i.e `alpha`-D-glucose with a specific of `+19^(@)`. HOWEVER, when either or these two forms is dissolved in water and ALLOWED to stand. It gets converted into the same EQUILIBRIUM mixture of both the `alpha`-and `beta`-forms with a small amount of open chain FORM `+112^(@)` to `52.7^(@)` while that of `beta` glucose increases from `+19^(@)` to `52.7^(@)`.

Discussion

38.	Assertion. The size of a degree on Fahrenheit scale is smaller than that on celsius scale. Reason. When temperature on celsius scale reads 0^(@), it reads 32^(@) on Fahrenheit scale.
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 explanation. 180 degrees on FAHRENHEIT scale `=100^(@)` on Calsius scale. HENCE, one degree on Fahrenheit scale `=(100)/(180)=(5)/(9)` degree on CELSIUS scale.

Discussion

39.	Assertion : The shape of XeF_(4) is square- planar. Reason : In an octahedral geometry, a single lone pair can occupy any position but a second lone pair will occupy the opposite position to the first lone pair.
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 Solution :

Discussion

40.	Assertion. The second ionization energies of ._(23)V, ._(24)Cr and ._(25)Mn are in the order V lt Cr lt Mn. Reason . Ionization energies show a regular increase along a period with increase of atomic number.
Answer» Solution :Correction A. The correct order of `IE_(2)` is `._(23)V lt ._(24)Crgt._(25)Mn` Correct R. Cr after LOSING one ELECTRON has `3d^(5)` stable configuration from which removal of second electron is DIFFICULT.

Discussion

41.	Assertion: The second dissociation constant of maleic acid is greater than fumaric acid. Reason: Higher the dissociation constant of acid more is acidic character.
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 :Both fumaric and maleric ACIDS have two ionisable `H^(+)` i.e., protons. The maleate monoanion shows intramolecular `H-` bonding and thus requires more energy tto GIVE maleate dianion. It is therefore second dissociation of fumaric acid is more than maleic acid since former does not show intramolecular H-bonding.

Discussion

42.	Assertion. The S-S-S bond angle in S_(8) molecule is 105^(@). Reason. S_(8) has V-shape.
Answer» If both assertion and reason are true, and reason is the correct explanation of the assertion. If both assertion and reason are TURE, but reason is not the correct explanantion of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Solution :Correct assertion. The S-S-S bond angle in `S_(8)` molecule is `107^(@)`. Correct reason. `S_(8)` has crown shaped puckered ring STRUCTURE.

Discussion

43.	Assertion : The resonance structure ofH-underset(H)underset(\|)overset(H)overset(\|)C-O-HisH-underset(H)underset(\|)overset(H)overset(\|)C=overset(+)O-H Reason : Methanol cannot be represent by a resonancestructure since the carbon atom has fivebonds.
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 :Phenol is least REACTIVE towards dehydration due to resonance stabilization . 2-cyclohexenol undergoes dehydration more READILY as it GIVES conjugated ALKENE. (Alcohols LEADING to conjugated alkenes are dehydrated more readily).

Discussion

44.	Assertion: The resistivity for a substance is its resistance when its is one meter long and its area of cross section is one square meter. Reason: The SI units of resistivity are ohm metre (Omega" "m) and ohm centimeter (Omega" "cm)
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 :We know, `RPROP(1)/(A)` ORR `R=rho((l)/(A))`, where proportionality constant `rho` is called RESISTIVITY. If l=1m and A=`1m^(2)`, then `R=rho` i.e., resistance=Resistivity.

Discussion

45.	Assertion: The relative lowering of vapour pressure for CH_3COOH + H2O solution is more in comparison to CH_3COOH + C_2H_6 Reason: Water is less volatile than benzene.
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

46.	Assertion : The relationship between DeltaG and emf of cell is DeltaG=-FE Reason : In the Nernst equation, 'n' denotes number of protons.
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

47.	Assertion. Thereductionof a metaloxideis easierifthe metalformedisin the liquidstate. Reason.Delta _f G^(@)of metaloxides increaseswithtemperature.
Answer» Ifbothassertionandreasonaretrue, andreason is NOTTHE trueexplanationofthe assertion. Ifbothassertionandreasonaretrue,butreasonis notthetrueexplanationoftheassertion. Ifassertionis true,butreason isfalse If bothassertionandreasonarefalse SOLUTION :Correctexplanation.Since entropy change` (Delta S ) ` ofthereductionprocessismore+ vewhenthemetal isin theliquid stateandtheoxidebeingreduced isinthesolidstate. Sincethe VALUEOF` T Delta S ` increasesandthatof` DELTAH`remainsconstant,therefore, the value` Delta_ rG^(@) `(Delta G =H- TDelta S ) `becomesmore- veandhencethereductionbecomeseasier.

Discussion

48.	Assertion: The reaction between a diazo salt and an aromatic amine or a phenol, giving an aminoazo or hydroxyazo compounds is called coupling reaction. Reason: Condensation of diazonium salt with phenol is carried out in weakly acidic medium.
Answer» If both assertion and reason are true and the reason is the correct explanantion 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 :Condensation of diazonium salt with phenol is carried out in weakly alkaline medium, (pH-9). This is due to the FACT that in strongly acid medium the -OH of a phenol remains UNIONISED, and an amine forms a salt. Phenol exists as phenoxide ION and the latter is READILY substituted by electrophiles than phenol itself. Thus, in phenol, coupling is carried out in alkaline medium.

Discussion

49.	Assertion : The reaction underset("Cane sugar")(C_(12)H_(22)O_(11)) + H_(2) O overset(H^(+))(t0) underset("Glucose")(C_(6)h_(12)O_(6)) + underset("Fructose")(C_(6)H_(12)O_(6)) is a first order reaction. Reason : Change in concentration of H_(2)O is negligible.
Answer» If both assertion and REASON are TRUE and reason is the correct explanation of assertion. If both assertion and reason are true butreason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :such reactions are CALLED pseudo first order reactions.

Discussion

50.	Assertion: The reaction 2NO+O_(2) to 2NO_(2) and 2CO + O_(2) to CO_(2) proceed at the same rate becausethese are similar. Reason: Both reactions have same activation energy.
Answer» If both ASSERTION and reason are 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 :d) Correct assertion: The listed REACTIONS donot PROCEED with the same RATE. Correct reason: The listed reactions donot have same activation energy.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion : Uracil occurs in DNA. Reason : RNAundergoes replication.

Assertion. Tungsten has very high melting point. Reason. Tunsten is a rare earth element.

Assertion : Trichloro acetic acid is much stronger acid than acetic acid Reason : Acidity decreases with increasing number of electron withdrawing substituents.

Assertion : Treatment of D-glucose with alkali affords an equilibrium , D-fructose and starting substance D-glucose, Reason: The reaction invovels an intermediate in which hybridization of C_(2) change from sp^(3) to sp^(2)

Assertion : Treatment of chloroethane with saturated solution of AgCN give ethyl isocyanide as major product. Reason : Cyanide ion (CN^(-)) is an ambident nucleophile.

Assertion: Treatment of chloroethane with a saturated solution of AgCN gives ethyl isocyanide as the major product. Reason: Cyanide ion (: CN^(-)) is an ambident nucleophile.

Assertion : Trans[CoCl_2(en)_2]^(2+)is optically inactive. Reason: The coordination numbers of the complex is 6.

Assertion : Transparent soaps are made by dissolving soaps in ethanol Reason: Ethanol makes things invisible.

Assertion. Trans [CoCl_(2)(en)_(2)]^(+) is optically inactive. Reason. Itis an octahedral complex.

Assertion : trans -2-Butene on reaction with Br_(2) gives meso-2,3-dibromobutane. Reason : The reaction involves syn-addition of bromine.

Assertion: Traces of moisture from phenol cann be easily removed by distilling with sodium metal. Reason: Wate is more acidic than phenol.

Assertion (A) Toxic metal ions are removed by the chelating ligands. Reason (R) Chelate complexes tend to be more stable.

Assertion : Toxic metal ions are removed by the chelating ligands Reason : chelate Chelate complexes tend to be more stable.

Assertion : To obtain maximum work from a galvaniccell charge has to be passed reversibly. Reason: The reversible work done by a galvanic cell is equal to decrease in its Gibbs energy.

Assertion:[Ti(H_2O)_6]^(3+) colourless Reason : d-dtransition is not possible since the central metal has d^(0) configuration.

Assertion: [Ti(H_(2)O)_(6)]^(4+) is coloured while [Sc(H_(2)O)_(6)]^(3+) is colourless. Reason: d-d transition is not possible in [Sc(H_(2)O)_(6)]^(3+).

Assertion [Ti (H_(2)O)_(6)] Cl_(4) is colourless while [Sc (H_(2)O)_(6)] Cl_(3) is coloured. Reason d-d transition is not possible in [Ti (H_(2)O)_(6)] Cl_(4)

Assertion : Ti can be purified by van arkel process Reason : TiI_(4) is a volatile compound which decomposes at a high temperature.

Assertion. Ti can bepurifiedby van Arkelprocess. Reason.TiI_ 4isavolatilecompoundwhichdecomposes ata hightemperature.

Assertion : Thiophene present in commercial benzene as an impurity can be removed by shaking the mixture with cold concentrated H_(2)SO_(4). Reason : Thiophene is a heterocyclic aromatic compound.

Assertion: Thionyl chloride reacts with straight chain primary alcohols without any rearrangement. Reason: SO_(2) escapes from the reaction mixture.

Assertion : Thermoplastics become hard on heating and soft on cooling. Reason : Themoplastics are cross - linked polymers which are solublein many organic solvents.

Assertion : There is no reaction known for which DeltaG is positive, yet it is spontaneous.Reason : For photochemical reactions DeltaG is negative

Assertion : Thermite mixture Fe_(2)O_(3)+ Al (powder) is used in the welding. Reason : Al is a good reductant.

Assertion: The vapour pressure of mixture of ethanol and water is greater than pure water. Reason: Ethanol & water form an azeotropic mixture.

Assertion : The values of colligative properties are of smaller order as compared to values shown by true solutions at same concentrations. Reason : Colloidal particles show Brownian movement .

Assertion : The valency and oxidationnumber of sulphur in S_(8) respectively are 2 and 0. Reason : S_(8) rhombic is the most stable allotropic form a sulphur.

Assertion :- The type of dentition in humans is called diphyodont. Reason :- A set of temoporary milkteeth is replaced by a set of permanent teeth in adult.

Assertion: The two strands of DNA are complementary to each other Reason: Adenine specifically forms hydrogen bonds with guanine whereas cytosine forms hydrogen bonds with thymine.

Assertion: The total number of isomers shown by [Co(en)_2Cl_2]^(+) complex ion is three Reason: [Co(en)_2Cl_2]^(+)complex ion has an octahedral geometry.

Assertion : The total number of atoms present in a simple cubic unit cell is one. Reason: Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent unit cells.

Assertion: The time of vulcanisation and temperature is increased by adding accelerators. Reason: By vulcanising, a material of high tensile strength can be obtained

Assertion: The third period contains only 8 electrons and not 18 like 4th period. Reason: In III perriod filling starts from 3s^(1) and complete at 3p^(6) whereas in IV period it starts from 4s^(1) annd complete after 3d^(10) and 4s^(2).

Assertion: The spin only magnetic moment of [MnBr_4]^(2-)is 5.9 BM Reason:[MnBr_4]^(2-)is tetrahedral with sp^3 hybridisation of Mn^(2+) having 3d^5 configuration

Assertion. The size of a degree on Fahrenheit scale is smaller than that on celsius scale. Reason. When temperature on celsius scale reads 0^(@), it reads 32^(@) on Fahrenheit scale.

Assertion : The shape of XeF_(4) is square- planar. Reason : In an octahedral geometry, a single lone pair can occupy any position but a second lone pair will occupy the opposite position to the first lone pair.

Assertion. The second ionization energies of ._(23)V, ._(24)Cr and ._(25)Mn are in the order V lt Cr lt Mn. Reason . Ionization energies show a regular increase along a period with increase of atomic number.

Assertion: The second dissociation constant of maleic acid is greater than fumaric acid. Reason: Higher the dissociation constant of acid more is acidic character.

Assertion. The S-S-S bond angle in S_(8) molecule is 105^(@). Reason. S_(8) has V-shape.

Assertion : The resonance structure ofH-underset(H)underset(|)overset(H)overset(|)C-O-HisH-underset(H)underset(|)overset(H)overset(|)C=overset(+)O-H Reason : Methanol cannot be represent by a resonancestructure since the carbon atom has fivebonds.

Assertion: The resistivity for a substance is its resistance when its is one meter long and its area of cross section is one square meter. Reason: The SI units of resistivity are ohm metre (Omega" "m) and ohm centimeter (Omega" "cm)

Assertion: The relative lowering of vapour pressure for CH_3COOH + H2O solution is more in comparison to CH_3COOH + C_2H_6 Reason: Water is less volatile than benzene.

Assertion : The relationship between DeltaG and emf of cell is DeltaG=-FE Reason : In the Nernst equation, 'n' denotes number of protons.

Assertion. Thereductionof a metaloxideis easierifthe metalformedisin the liquidstate. Reason.Delta _f G^(@)of metaloxides increaseswithtemperature.

Assertion: The reaction between a diazo salt and an aromatic amine or a phenol, giving an aminoazo or hydroxyazo compounds is called coupling reaction. Reason: Condensation of diazonium salt with phenol is carried out in weakly acidic medium.

Assertion : The reaction underset("Cane sugar")(C_(12)H_(22)O_(11)) + H_(2) O overset(H^(+))(t0) underset("Glucose")(C_(6)h_(12)O_(6)) + underset("Fructose")(C_(6)H_(12)O_(6)) is a first order reaction. Reason : Change in concentration of H_(2)O is negligible.

Assertion: The reaction 2NO+O_(2) to 2NO_(2) and 2CO + O_(2) to CO_(2) proceed at the same rate becausethese are similar. Reason: Both reactions have same activation energy.