94420 + Interview Questions in Chemistry in Class 12

1.	Assertion (A): The amino acids which can be synthesised in the body are known as essential amino acids. Reason (R) : Most naturally occurring amino acids have L-configuration.
Answer» Both Assertion (A) and Reason (R) are CORRECT statementand Reason (R) is the correctexplanationof the Assertion (A). Both Assertion (A) and Reason (R) are CORRECTSTATEMENTS, but Reason(R) is notthe correctexplanation of the Assertion (A). Assertion (A) is correct, but Reason(R) is INCORRECT statement Assertion (A) is incorrect , but Reason (R) is correct statement. Answer :D

Discussion

2.	Assertion (A) : The acidic strength of halogen acids varies in the order HF> HCl> HBr> HI Reason (R ) : The bond dissociation enthalpy of halogen acids decreases in the order : HF> HCl> HBr> HI
Answer» Both Assertion (a) And REASON (R )are CORRECT Statement . And Reason (R )is the correct EXPLANATION of the Assertion (A) Both Assertion (A) and Reason (R ) are correct statement , bbut Reason (R ) is not the correct expanation of the Assertion (A) Assertion (A) is correct , but Reason (R ) is correct statement . Assertion (A ) is incorrect but Reason (R ) Is correct statement. ANSWER :D

Discussion

3.	Assertion (A) : Tertiary nitroalkanes cannot tautomerise to aciform. Reason (R) : Tertiary nitroalkanes do not contain alpha-hydrogen.
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. A is false but R is false. Answer :A

Discussion

4.	Assertion (A): Tertiary nitro alkanes do not exhibit tautomerism. Reason(R):Tertiary nitro alkanes do not have of alpha- H atom
Answer» Both A and R are CORRECT and r is explains A Both A and R but R is wrong A is correct but R is wrong A is wrong but R is correct Answer :A

Discussion

5.	Assertion (A): Tertiary methyl amine is less soluble in water tha methyl amine. Reason(R):Solubility decreases due to the increase in size of the hydrophobic alkyl group.
Answer» Both A and R are correct and r is EXPLAINS A Both A and R but R is wrong A is correct but R is wrong A is wrong but R is correct Answer :C

Discussion

6.	Assertion (A) : tert-Butyl bromide undergoes Wurtz reaction to give 2, 2, 3, 3 - tetramethyl butane.Reason (R ) : In Wurtz reaction, alkyl halides react with sodium in dry ether to give hydrocarbon containing double the number of carbon atoms present in the halide.
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 correct explanation of assertion. Solution :`2CH_(3)-OVERSET(CH_(3))overset("\|")underset(CH_(3))underset("\|")("C ")-Br+2Na overset(" Ether ")rarr CH_(3)-overset(CH_(3))overset("\|")underset(CH_(3))underset("\|")("C ")-overset(CH_(3))overset("\|")underset(CH_(3))underset("\|")("C ")-CH_(3)`

Discussion

7.	Assertion (A): tert- Butyl bromide (Me_(3)C-Br) and sodium ethoxide (NaORt) will react to form only ether.Reason (R):Ethers are preapared form soidum alkoxide and alkyl halide.
Answer» Both `(A)` and `(R)` are true and `(R0` is the correct EXPLANATION of `(A)`. Both `(A)` and `(R)` are true but `(R)` is not the correct explanation of `(A)`. `(A) is true but `(R)` is false. `(A) is falsebut `(R)` is true. Solution :NA

Discussion

8.	Assertion (A) : Surface of an adsorbent shows the preference for a particular gas. Reason (R) : van der Waals' forces are not universal.
Answer» ASSERTION (A) and Reason (R) both are TRUE. (R) is the proper explanation of (A). Assertion (A) and Reason (R) both are true but (R) does not EXPLAINS (A). Assertion (A) and Reason (R) both are false. Assertion (A) is not true but Reason (R) is true. Solution :Assertion (A) and Reason (R) both are false.

Discussion

9.	Assertion (A) : Surcose is anbib reducingsugar. Reason (R) : In sucrose , C_(1) of alpha - Dglucoseand C_(2)of D- fructosearejoined together by glycosidic bond . Boththe carbonyl carbonsare involvedin glycosidic bonding .
Answer» Both A and R are correct but R is not the correct EXPLANATION of A. Both A and R are correct and R the correct explanation of A A is correct but R is WRONG. Ais wrong but R is correct Answer :B

Discussion

10.	Assertion (A) : Sulphuric acid is a high boiling point and viscous liquid. Reason (R ) : This is due to the association of molecules together hydrogen bonding.
Answer» A are R are CORRECT and R EXPLAINS A A and R are correct but doesn't explains A A is correct but R is wrong A is wrongbut R is correct Solution :A are R are correct and R explains A

Discussion

11.	Assertion (A) : Sulphuric acid is highly reactive. Reason (R ) : Sulphuric acid can act as strong acid and an oxidising agent.
Answer» A are R are CORRECT and R EXPLAINS A A and R are correct but doesn't explains A A is correct but R is wrong A is wrongbut R is correct Solution :A and R are correct but doesn.t explains A

Discussion

12.	Assertion (A): Sulphide ore are concentrated by forth floatation process. Reason (R ):Sulphide ores are preferentialy 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

13.	Assertion (A) : Sulpha drug contain sulphonamide group. Reason (R) : Salvarsan is a sulpha drug.
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 :Assertion is correct statement reason is wrong statement. Assertion is correct statement reason is wrong statement. Correct reason salvarsan is a ANTIBACTERIAL but does not contain sulfonamide GROUP.

Discussion

14.	Assertion (A) : Sucrose is a non-reducing sugar. Reason (R ) : Sucrose has glycosidic linkage.
Answer» Both Assertion (A) and Reason (R ) are CORRECT STATEMENTS, and Reason (R ) is the correct explanation of the Assertion (A). Both Assertion (A) and Reason (R ) are correct statements, but Reason (R ) is not the correct explanation of the ASSERITON (A). Assertion (A) is correct, but Reason (R ) is incorrect statement. Assertion (A) is incorrect, but Reason (R ) is correct statement. ANSWER :A

Discussion

15.	Assertion (A) : Strong electrolytes have low molar conductivity at high concentration. Reason (R) : For a strongelectrolyte, at high concentration, the number of constituent ions of the electrolyte is high and hence the attractive force between the oppositely charged ions is also high.
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A Both A and R are WRONG A is correct but R is wrong A is wrong but R is correct ANSWER :A

Discussion

16.	Assertion (A) : Strach consists of twocomponents , amyloseandamylopetic. Reason (R): Thecarbohydrates are storedin animal body asa glycogen.
Answer» Both Assertion (A) and REASON (R) are correct statementand Reason (R) is the correctexplanationof the Assertion (A). Both Assertion (A) and Reason (R) are CORRECTSTATEMENTS, but Reason(R) is notthe correctexplanation of the Assertion (A). Assertion (A) is correct, but Reason(R) is incorrect statement Assertion (A) is incorrect , but Reason (R) is correct statement. Answer :B

Discussion

17.	Assertion (A) : Spin only formula to determine the magnetic movement of a substance is : mu=sqrt(n(n+2)) Reason (R) : A simple unpaired election has a magnetic moment of 1.73 BM.
Answer» Both ASSERTION (A) and Reason (R) are correct statements, and Reason (R) is the correct EXPLANATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). Assertion (A) is correct, but Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :B

Discussion

18.	Assertion : A solutionof surcoseof sucrosein wateris dextrorotatory. Buton hydrolysis in thepresenceof little hydrochloricacid, it becomeslevorotatory. Reason : Sucrosehydrolysisgivesunequal amountsof glucoseand fructose. As a result ofthischangein signof rotationis observed .
Answer» If both accretionand reasonare TRUEAND REASON is the correctexplanationof ASSERTION . Ifbothassertionand reasonare truebutreason is notthe correctexplanationof assertion If assertionis truebutreasonis FALSE If bothassertionand reason are false Answer :A

Discussion

19.	Assertion: A solution contains one gram equivalent of solute per litre of the solution is called a normal solution. Reason: A normal solution means a solution in which the solute does not associate or dissociate.
Answer» If both ASSERTION are reason are correct and reason is correct EXPLANATION for assertion. If both assertion and reason are CORRCT but reason is not correct explanation for assertion. If assertion is corrct but reason is incorrect. If assertion and reason both are incrrect. Solution :Correct EXPLAINATION. The solution is regarded as I M solution.

Discussion

20.	Assertion: A solution of sucrose in water is dextrorotatory but on hydrolysis in presence of little hydrochloric acid, it becomes laevorotatory. Reason: Sucrose on hydrolysis gives unequal amounts of glucose and fructose as.
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 :Sucrose on hydrolysis GIVES equal AMOUNTS of glucose and fructose. Since glucose has LESS positive Which of the FOLLOWING and fructose has more negative magnitude of rotation, THEREFORE, change in the sign of rotation is observed .

Discussion

21.	Assertion: A solution of sucrose in water is dextro-rotatory but upon the hydrolysis in the presence of a little hydrolysis in the presence of a little hydrochloric acid, it becomes laevo rotatory. Reason: Sucrose upon hydrolysis gives unequal amounts of glucose and fructose. As a result, change in sign of rotation is observed.
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 :Correct reason: Sucrose upon hydrolysis forms EQUAL AMOUNTS of GLUCOSE and fructose but the laevo rotation of fuctrose is more than the dextro rotation of glucose.

Discussion

22.	Assertion : A solution of sucrose in water is dextro rotatory but on hydrolysis in presence of little HCl it becomes laevorotatory. Reason : Sucrose on hydrolysis gives unequal amount of glucose and fructose as a result sign of rotation changes.
Answer» ASSERTION and REASON both are CORRECT and reason is the CORRECT explanation of the assertion. Assertion and reason both are wrong statements. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. ANSWER :C

Discussion

23.	Assertion : A solution of sucrose in water is dexotrorotatory but on hydrolysis in presence of little hydrochloric acid , it because laevorotatory. Reason : Sucrose on hydrolysis gives unequal amounts of glucose and fructose as a result of which change in sign of rotation is observed.
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 reason : Sucrose on HYDROLYSIS gives EQUAL amounts of glucose and FRUCTOSE. Since fructose is more laevorotatory than glucose is dextrorotatory. THEREFORE , the resulting mixture becomes laevorotatory.

Discussion

24.	Assertion : A solution of FeCl_(3) in water produce brown precipitate on standing. ltbr. Reason : Hydrolysis of FeCl_(3) takes place in water.
Answer» If both assertion and REASON are true and 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 :Aq. Solution of `FeCl_(3)` on STANDING produce brown ppt. Due to HYDROLYSIS it produce ppt. of `Fe(OH)_(3)`which is of brown COLOUR. Hence both are correct and reason is a correct explanation.

Discussion

25.	Assertion : A solution of AgCI in NH_(4)OH gives a whiteprrecipitate when acidified with NHO_(3) Reasion : [Ag(NH_(3))_(2)]^(o+) decompoes in thepresence of HNO_(3)
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 Solution :AgCI dissolves in `NH_(4)OH` to from `[Ag(NH_(3))_(2)]^(Theta)` and `CI^(Theta)` ions whenacidefiedwith `HNO_(2),[Ag(NH_(3))_(2)]^(Theta)` ions GET decomposed to give `Ag^(Theta)`ions which REACTSWITH `CI^(Theta)` to from a whiteprecipitate of `AgCI` ` AgCI + 2NH_(4)OH rarr [Ag(NH_(3))_(2)]^(Theta) + 2H_(2)O + CI^(Theta)` ` [Ag(NH_(3))_(2)]^(Theta) + 2H^(Theta) rarr Ag^(Theta) + 2NH_(4)^(Theta)` `Ag^(Theta) + CI^(Theta) rarr AgCI darr ` THus (A) and (R ) are TRUE and (R ) is the correct EXPLANATION for (A)

Discussion

26.	Assertion: A solution is a homogeneous mixture of two or more chemically non-reacting substances. Reason :Solutions can be made between any two states of matter.
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

27.	Assertion : A solution containing acetic acid and sodium acetate acts as a buffer solution. Reason : The pH of the above buffer would be equal to pK_a of acetic acid.
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 :B

Discussion

28.	Assertion (A) : Solubility of amines decreases with increase in the molar mass of mines. Reason (R) : The hydrophobic alkyl part increases with the increase in molar mass in amines.
Answer» Both Assertion (A) and Reason (R) are CORRECT statements, and Reason (R) is the correct EXPLANATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). Assertion (A) is correct, but Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :A

Discussion

29.	Assertion (A) : Solubility of a gas in a liquid is directly proportional to the pressure of the gas. Reason (R) : Solutions which show positive deviations from Raoult's law from maximumboiling azeotropes at a specific composition.
Answer» Both ASSERTION (A) and Reason (R) are correct STATEMENTS, and Reason (R) is the correct EXPLANATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). Assertion (A) is correct, but Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :C

Discussion

30.	Assertion (A) : Solids have definite mass, volume and shape. Reason (R) : Solids can be classified as crystalline and amorphous.
Answer» Both ASSERTION (A) and Reason (R) are correct STATEMENTS, and Reason (R) is the correct EXPLANATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). Assertion (A) is correct, but Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :B

Discussion

31.	Assertion (A) : Solid ice, Glucose are generally soft solids under room temperature Reason (R): The constituents are held together by strong electrostatic forces of attraction
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A. Both A and R are correct but R is not the correct explanation of A A is correct but R is WRONG A is wrong but R is correct Solution :A is correct but R is wrong.

Discussion

32.	Assertion (A) : Solid CO_(2) Solid NH_(3) have higher melting points Reason (R): The constituents are molecules formed by polar covalent bonds. They are held together by relatively strong dipole- dipole interactions.
Answer» A is CORRECT but R is WRONG A is wrong but R is correct A and R are correct and R is the correct explanation of A. A and R are correct but R is not the correct explanation of A SOLUTION :A and R are correct and R is the correct explanation of A

Discussion

33.	Assertion (A) : Sodium chloride is added to precipitate soap after saponification. Reason (R) : Hydrolysis of esters of long chain fatty acids by alkali produces soap in colloidal form.
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 :Assertion and reason both are correct and reason explains the assertion.

Discussion

34.	Assertion (A) : Sodium chloride and sugar readily dissolve in benzene.Reason (R) : A solution in which no more solid can be dissolved at the same temperature and pressure.
Answer» Both ASSERTION (A) and Reason (R) are CORRECT statements, and Reason (R) is the correct EXPLANATIONOF the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanationof the Assertion (A). Assertion (A) is correct, but Reason (R) is INCORRECT statement, Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :D

Discussion

35.	Assertion (A) : SnO_(2) and white tin possess tetragonal structure. Reason (R) : Number of atoms per unit cell in body-centred cubic unit cell is 4.
Answer» Both Assertion (A) and REASON (R) are CORRECT STATEMENTS, and Reason (R) is the correct EXPLANATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). Assertion (A) is correct, but Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :C

Discussion

36.	Assertion (A): SN^(2) reaction is carried out in the presenceof polar aprotic solvent. Reason (R): Polar aprotic solvents do not contain acidic hydrogen.
Answer» Both `(A)` and `(R)` are true and `(R0` is the correct explanation of `(A)`. Both `(A)` and `(R)` are true but `(R)` is not the correct explanation of `(A)`. `(A) is true but `(R)` is false. `(A) is falsebut `(R)` is true. Solution :NA

Discussion

37.	Assertion (A) : Silver chloride dissolves in methyl amine solution. Reason (R) : Silver chloride is insoluble in water.
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. A is false but R is false. Answer :B

Discussion

38.	Assertion (A) : Significant figures for 0.200 is 3 whereas for 200 it is 1. Reason (R) : Zero at the end or right of a number are significant provided they are not on the right side of the decimal point.
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 the correct explanation of A. A is true but R is false. Both A and R are false. Solution :Correct R. If a NUMBER ends in ZEROS but these zeros are not to the light of a DECIMAL point, these zeros may or may not be significant.

Discussion

39.	Assertion (A) : Side chain halogenation of alkyl benzenes followed by hydrolysis gives aromatic ketones. Reason (R) : Gatterman-Koch reaction is used toprepare benzaldehyde from benzene using CO //HCl/Anhy. AlCl_(3).
Answer» Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). Assertion (A) is correct, but Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement Answer :D

Discussion

40.	Assertion (A) : S.I. unit of conductivity is siemen represented by S and is equal to ohm^(-1) or mho or Omega^(-1). Reason (R): Conductivity of an electrolyte depends upon the nature of the electrolyte.
Answer» Both ASSERTION (A) and Reason (R) are CORRECT statements, and Reason (R) is the correct EXPLANATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A) Assertion (A) is correct, but Reason (R) is incorrect statement. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :B

Discussion

41.	Assertion (A): Separation of Zr and Hf is difficult. Reason (R ): Because Zr and Hf lie in the same group of the periodic table.
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 correct explanation of the assertion Assertion is not true reason is true Both assertion and reason are false Solution :Separation of Zr and HF is DIFFICULT because both have nearly same atomic radii.

Discussion

42.	Assertion (A) : SeCl_4 does not have a tetrahedral structure. Reason (R) :Se in SeCl_4 has two lone pairs.
Answer» Both A and R TRUE and R is the correct explanation of A Both A and R true and R is not acorrect explanation of A A is true but R is FALSE A is false but R is true Answer :C

Discussion

43.	Assertion (A) : Schottky defect does not change the stoichiometry of the crystal. Reason (R) : This defect arises due to the missing of equal number of cations and anions from the crystal lattice.
Answer» Both A and R are CORRECT but R is not the correct EXPLANATION of A Both A and R are correct and R is the correct explanation of A A is correct but R is WRONG. A is wrong but R is correct Solution :Both A and R are correct and R is the correct explanation of A

Discussion

44.	Assertion (A) : SBR is a copolymerof twomoles of butadiene andmoleof styrene. Naturalrubberis used in makingshoes , golf balls and waterproof coats.
Answer» Both Assertion (A) and REASON (R) arecorrect statement and Reason (R) is the correct explanationof the Assertion(A). Both Assertion (A) and Reason (R) are correct statement ,but Reason (R) is notthe correct explanationof the Assertion (A) Assertion (A) is correct, but Reason (R) isincorrect statement Assertion (A) is INCORRECT , but Reason (R) is correct statement. Answer :D

Discussion

45.	Assertion (A): Saccharic acid is obtained by the oxidation of gluconic acid or glucose. Reason (R) : The letters D or L before the name of any compound indicate the relative configuration of a particular stereoisomer.
Answer» Both ASSERTION (A) and Reason (R) are CORRECT STATEMENTAND Reason (R) is the correctexplanationof the Assertion (A). Both Assertion (A) and Reason (R) are correctstatements, but Reason(R) is notthe CORRECTEXPLANATION of the Assertion (A). Assertion (A) is correct, but Reason(R) is INCORRECT statement Assertion (A) is incorrect , but Reason (R) is correct statement. Answer :B

Discussion

46.	Assertion (A) : Roasting process is involved in the metallurgy of Cu from malachite ore. Reason (R ) : Roasting is the process of heating the ore in the absence of air.
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 :D

Discussion

47.	Assertion (A) : Rhombic sulphur is obtained by evaporating a solution of roll sulphur is CS_2 Reason (R) : Fluorine forms two oxides, OF_2 and O_2F_2.
Answer» Both ASSERTION (A) and Reason (R) are CORRECT statements, and RENSON (R) is the correct EXPLANATION of the Assertion (A) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A) Assertion (A) is correct, but Reason (R) is INCORRECT statement. Assertion (A) is incorrect, but Reason (R) is correct statement Answer :B

Discussion

48.	Assertion (A) : Relative lowering of vapour pressure is equal to the mole fraction of the solute.Reason (R) : The unit of K_f(Cryoscopic constant) is K kg "mol"^(-1)
Answer» Both ASSERTION (A) and REASON (R) are correct STATEMENTS, and Reason (R) is the correct explanationof the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanationof the Assertion (A). Assertion (A) is correct, but Reason (R) is INCORRECT statement, Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :B

Discussion

49.	Assertion (A): Reduction potential value (E^(@)) of o-benzoquine (I) is greater than p-benzouinone (II) Q+2H^(o+)+2bar e rarr H_(2)Q Reason (R ): Two adjacent (C=O) groups in (I) destabilise (I) relative to (II).
Answer» If both (A) and (R ) are TRUE and (R ) is the CORRECT EXPLANATION of (A). If both (A) and (R ) are true but (R ) is not the correct explanation of (A). If (A) is true but (R ) is false. If both (A) and (R ) are false. Solution :NA

Discussion

50.	Assertion (A) : Reimer-Tiemann reaction of phenol yields salicylic acid. Reason (R) : Ethers may be prepared by Williamson synthesis.
Answer» Both Assertion (A) and REASON (R) are correct statements, and Reason (R) is the correct EXPLANATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanationof the Assertion (A). Assertion (A) is correct, but Reason (R) is INCORRECT statement. Assertion (A) is incorrect, but Reason (R) is correct statement. Answer :D

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion (A): The amino acids which can be synthesised in the body are known as essential amino acids. Reason (R) : Most naturally occurring amino acids have L-configuration.

Assertion (A) : The acidic strength of halogen acids varies in the order HF> HCl> HBr> HI Reason (R ) : The bond dissociation enthalpy of halogen acids decreases in the order : HF> HCl> HBr> HI

Assertion (A) : Tertiary nitroalkanes cannot tautomerise to aciform. Reason (R) : Tertiary nitroalkanes do not contain alpha-hydrogen.

Assertion (A): Tertiary nitro alkanes do not exhibit tautomerism. Reason(R):Tertiary nitro alkanes do not have of alpha- H atom

Assertion (A): Tertiary methyl amine is less soluble in water tha methyl amine. Reason(R):Solubility decreases due to the increase in size of the hydrophobic alkyl group.

Assertion (A) : tert-Butyl bromide undergoes Wurtz reaction to give 2, 2, 3, 3 - tetramethyl butane.Reason (R ) : In Wurtz reaction, alkyl halides react with sodium in dry ether to give hydrocarbon containing double the number of carbon atoms present in the halide.

Assertion (A): tert- Butyl bromide (Me_(3)C-Br) and sodium ethoxide (NaORt) will react to form only ether.Reason (R):Ethers are preapared form soidum alkoxide and alkyl halide.

Assertion (A) : Surface of an adsorbent shows the preference for a particular gas. Reason (R) : van der Waals' forces are not universal.

Assertion (A) : Surcose is anbib reducingsugar. Reason (R) : In sucrose , C_(1) of alpha - Dglucoseand C_(2)of D- fructosearejoined together by glycosidic bond . Boththe carbonyl carbonsare involvedin glycosidic bonding .

Assertion (A) : Sulphuric acid is a high boiling point and viscous liquid. Reason (R ) : This is due to the association of molecules together hydrogen bonding.

Assertion (A) : Sulphuric acid is highly reactive. Reason (R ) : Sulphuric acid can act as strong acid and an oxidising agent.

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

Assertion (A) : Sulpha drug contain sulphonamide group. Reason (R) : Salvarsan is a sulpha drug.

Assertion (A) : Sucrose is a non-reducing sugar. Reason (R ) : Sucrose has glycosidic linkage.

Assertion (A) : Strong electrolytes have low molar conductivity at high concentration. Reason (R) : For a strongelectrolyte, at high concentration, the number of constituent ions of the electrolyte is high and hence the attractive force between the oppositely charged ions is also high.

Assertion (A) : Strach consists of twocomponents , amyloseandamylopetic. Reason (R): Thecarbohydrates are storedin animal body asa glycogen.

Assertion (A) : Spin only formula to determine the magnetic movement of a substance is : mu=sqrt(n(n+2)) Reason (R) : A simple unpaired election has a magnetic moment of 1.73 BM.

Assertion : A solutionof surcoseof sucrosein wateris dextrorotatory. Buton hydrolysis in thepresenceof little hydrochloricacid, it becomeslevorotatory. Reason : Sucrosehydrolysisgivesunequal amountsof glucoseand fructose. As a result ofthischangein signof rotationis observed .

Assertion: A solution contains one gram equivalent of solute per litre of the solution is called a normal solution. Reason: A normal solution means a solution in which the solute does not associate or dissociate.

Assertion: A solution of sucrose in water is dextrorotatory but on hydrolysis in presence of little hydrochloric acid, it becomes laevorotatory. Reason: Sucrose on hydrolysis gives unequal amounts of glucose and fructose as.

Assertion : A solution of sucrose in water is dextro rotatory but on hydrolysis in presence of little HCl it becomes laevorotatory. Reason : Sucrose on hydrolysis gives unequal amount of glucose and fructose as a result sign of rotation changes.

Assertion : A solution of sucrose in water is dexotrorotatory but on hydrolysis in presence of little hydrochloric acid , it because laevorotatory. Reason : Sucrose on hydrolysis gives unequal amounts of glucose and fructose as a result of which change in sign of rotation is observed.

Assertion : A solution of FeCl_(3) in water produce brown precipitate on standing. ltbr. Reason : Hydrolysis of FeCl_(3) takes place in water.

Assertion : A solution of AgCI in NH_(4)OH gives a whiteprrecipitate when acidified with NHO_(3) Reasion : [Ag(NH_(3))_(2)]^(o+) decompoes in thepresence of HNO_(3)

Assertion: A solution is a homogeneous mixture of two or more chemically non-reacting substances. Reason :Solutions can be made between any two states of matter.

Assertion : A solution containing acetic acid and sodium acetate acts as a buffer solution. Reason : The pH of the above buffer would be equal to pK_a of acetic acid.

Assertion (A) : Solubility of amines decreases with increase in the molar mass of mines. Reason (R) : The hydrophobic alkyl part increases with the increase in molar mass in amines.

Assertion (A) : Solubility of a gas in a liquid is directly proportional to the pressure of the gas. Reason (R) : Solutions which show positive deviations from Raoult's law from maximumboiling azeotropes at a specific composition.

Assertion (A) : Solids have definite mass, volume and shape. Reason (R) : Solids can be classified as crystalline and amorphous.

Assertion (A) : Solid ice, Glucose are generally soft solids under room temperature Reason (R): The constituents are held together by strong electrostatic forces of attraction

Assertion (A) : Solid CO_(2) Solid NH_(3) have higher melting points Reason (R): The constituents are molecules formed by polar covalent bonds. They are held together by relatively strong dipole- dipole interactions.

Assertion (A) : Sodium chloride is added to precipitate soap after saponification. Reason (R) : Hydrolysis of esters of long chain fatty acids by alkali produces soap in colloidal form.

Assertion (A) : Sodium chloride and sugar readily dissolve in benzene.Reason (R) : A solution in which no more solid can be dissolved at the same temperature and pressure.

Assertion (A) : SnO_(2) and white tin possess tetragonal structure. Reason (R) : Number of atoms per unit cell in body-centred cubic unit cell is 4.

Assertion (A): SN^(2) reaction is carried out in the presenceof polar aprotic solvent. Reason (R): Polar aprotic solvents do not contain acidic hydrogen.

Assertion (A) : Silver chloride dissolves in methyl amine solution. Reason (R) : Silver chloride is insoluble in water.

Assertion (A) : Significant figures for 0.200 is 3 whereas for 200 it is 1. Reason (R) : Zero at the end or right of a number are significant provided they are not on the right side of the decimal point.

Assertion (A) : Side chain halogenation of alkyl benzenes followed by hydrolysis gives aromatic ketones. Reason (R) : Gatterman-Koch reaction is used toprepare benzaldehyde from benzene using CO //HCl/Anhy. AlCl_(3).

Assertion (A) : S.I. unit of conductivity is siemen represented by S and is equal to ohm^(-1) or mho or Omega^(-1). Reason (R): Conductivity of an electrolyte depends upon the nature of the electrolyte.

Assertion (A): Separation of Zr and Hf is difficult. Reason (R ): Because Zr and Hf lie in the same group of the periodic table.

Assertion (A) : SeCl_4 does not have a tetrahedral structure. Reason (R) :Se in SeCl_4 has two lone pairs.

Assertion (A) : Schottky defect does not change the stoichiometry of the crystal. Reason (R) : This defect arises due to the missing of equal number of cations and anions from the crystal lattice.

Assertion (A) : SBR is a copolymerof twomoles of butadiene andmoleof styrene. Naturalrubberis used in makingshoes , golf balls and waterproof coats.

Assertion (A): Saccharic acid is obtained by the oxidation of gluconic acid or glucose. Reason (R) : The letters D or L before the name of any compound indicate the relative configuration of a particular stereoisomer.

Assertion (A) : Roasting process is involved in the metallurgy of Cu from malachite ore. Reason (R ) : Roasting is the process of heating the ore in the absence of air.

Assertion (A) : Rhombic sulphur is obtained by evaporating a solution of roll sulphur is CS_2 Reason (R) : Fluorine forms two oxides, OF_2 and O_2F_2.

Assertion (A) : Relative lowering of vapour pressure is equal to the mole fraction of the solute.Reason (R) : The unit of K_f(Cryoscopic constant) is K kg "mol"^(-1)

Assertion (A): Reduction potential value (E^(@)) of o-benzoquine (I) is greater than p-benzouinone (II) Q+2H^(o+)+2bar e rarr H_(2)Q Reason (R ): Two adjacent (C=O) groups in (I) destabilise (I) relative to (II).

Assertion (A) : Reimer-Tiemann reaction of phenol yields salicylic acid. Reason (R) : Ethers may be prepared by Williamson synthesis.