94420 + Interview Questions in Chemistry in Class 12

1.	Assertion : Alpha (alpha) amino acids exist as internal slat in solution as they have amino acid and carboxylic acid groups in near vicinity. Reason : H^(+) ion given by carboxyl group (-COOH) is captured by amino group (-NH_2) having lone pair of electrons.
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. Answer :A

Discussion

2.	Assertion: alpha-amino acids exist as dipolar ions or zwitter ion. Reason: alpha-amino acids are the building blocks of proteins.
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 :In acidic MEDIUM -COOH group acts as the base and accepts a proton. As a result, `alpha`-amino acids exist as cations in acidicmedium and migrate towards cathode under the influence of an electric field. In alkaline medium `overset(+)(N)H_(3)` group acts as the acid and thus loses a proton. as a result, `alpha`-amino acids exist as anion and migrate towards anode under the influence of an electric field. however at some intermediate value of PH , the concentration of CATIONIC FORM and anionic form will become equal and hence there is no net migration of `alpha`-amino acids under the influence of an electric field

Discussion

3.	Assertion : All the ores are mineral.
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 :C

Discussion

4.	Assertion : All naturally occuring alpha-amino acids expect glycine are optically active. Reason : Most naturally occuring amino acids have L-configuration.
Answer» Assertion and reason both are correct statements and reason explains the assertion. Both assertion and reason are wrong statements. Assertion is correct statement and reason is wrong statement. Assertion and reason both are correct statements but reason does not EXPLAIN assertion. Solution :Correct explanation . All `ALPHA`-amino acids except GLYCINE contain at least one CHIRAL CARBON.

Discussion

5.	Assertion: All naturally occuring alpha-amino acids are optically activeReason: Most naturally occuring amino acids have D-configuration.
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 :Glycine is optically INACTIVE. Most NATURALLY OCCURING amino acids have L-configuration.

Discussion

6.	Assertion : All molecules collisions lead to the formation of products. Reason : Reactant molecules undergo chemical change irrespective of their collision. Assertion : Rate of reaction increases with increase in temperature . Reason : Number of effective collisions increases with increase in temperature.
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. Answer :D

Discussion

7.	Assertion. All F-S-F bond angles in SF_(4) are greater than 90^(@) but less than 180^(@) Reason. The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion.
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 reason. Due to STRONGER lone PAIR-bond pair repulsion, all the FSF angle are greater than `90^(@)`

Discussion

8.	Assertion: All enzymes found in cells are invariably proteins which catalyse biological reactions.Reason : Enzymes act efficiently at a moderate temperature and pH.
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 :B

Discussion

9.	Assertion : All enzymes are proteins but all proteins are not enzymes. Reason : Enzymes are biocatalysts and posses a stable configuration having an active site pocket.
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. ANSWER :A

Discussion

10.	Assertion : All diatomic molecules with polar bond have dipole moment. Reason : Dipole moment is a vector quantity.
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

11.	Assertion : All collisions of reactant molecules lead to product formation. Reason : Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.
Answer» Both assertion and REASON are correct and the reason is correct explananation of assertion. Both assertion and reason are correct but reason does not explain assertion. Assertion is correct but reason is incorrect. Assertion is incorrect but reason is correct. Solution :Correction Assertion. All collisions of REACTANT molecules do not lead to PRODUCT FORMATION.

Discussion

12.	Assertion : All collision of reactant molecule lead to product formation. Reason : Product formation is independent of oriendation of the reactant moleucles.
Answer» Both ASSERTION and reason are true and reason is the CORRECT explanation of assertion. Both assertion and reason are true but reason is not the correct explanation of assertion. Assertion is true but reason is FALSE. Both assertion and reason are false. Answer :D

Discussion

13.	Assertion: All amino acids exists as Zwitter ions. Reason: Amino acids have both - NH_(2) and -COOH group
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 :All amino ACIDS possess amino as well as carboxylic group. `-NH_(2)` group is BASIC while -COOH group is acidic. Therefore, they behaveas zwitter ion (DIPOLAR ion) here, both assertion and reason are true and reason is a correct explanation.

Discussion

14.	Assertion : All aldehydes donot take part in aldol condensation. Reason : In th aldol condensation, carbanion is generated by the abstraction of alpha-H atopm by the base.
Answer» If both assertion and reason are CORRECT and reason is correct EXPLANATION for assertion. If both assertion and reason are correct and reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. If assertion as well as reason are both incorrect. Solution :Correct explanation. Only the aldehyes with `alpha`-HYDROGEN ATOM take part in the nuclephilic addition reactions.

Discussion

15.	Assertion: Alkyl iodide can be prepared by treating alkyl chloride/bromide with NaI in acetone. Reason: NaCl/NaBr are soluble in acetone while NaI is not.
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 reason. NaCl/NaBr are INSOLUBLE in acetone while NaI is SOLUBLE.

Discussion

16.	Assertion: Alkyl halides are soluble in organic solvents. Reason: p-dichlorobenzene possesses low melting point.
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 :Due to SYMMETRICAL nature and more closer packing p-dichlorobenzene has highest milting point.

Discussion

17.	Assertion: Alkyl cyanides and alkyl isocyanides have much higher boiling points than corres- ponding alkyl halides. Reason : Cyanides and isocyanides are much more polar than alkyl halides.
Answer» ANSWER :a

Discussion

18.	Assertion: Alkaline hydrolysis of ester is known as saponification. Reason: Alkaline hydrolysis of ester is a first order reaction. Reason: Alkaline hydrolysis of ester is a first order reaction.
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 :B) Correct explanation: It is PSEUDO first ORDER reaction.

Discussion

19.	Assertion : Alkali metals cannot be prepared by the electrolysis of aq. MgCl_2 . Reason : The reduction potential of Mg^(2+)is much lower than that of H^(+).
Answer» If both ASSERTION and REASON are TRUE and Reason is the correct explanation of Assertion. If both Assertion and Reason are true and Reason is not the correct explanation of Assertion. If Assertion is true and Reason is false. If Assertion is false and Reason is true Answer :A

Discussion

20.	Assertion: alkali earth metals have lower densities than alkali metals. Reason: atomic radii of alkaline earth metals are smaller than that of corresponding alkali metals.
Answer» 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 If assertion is FALSE but reason is true If assertion is true but the reason is false ANSWER :D

Discussion

21.	These questions consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses: Assertion: [Al(H_2O)_6]^(3+) is a stronger acid than [Mg(H_2O)_6]^(2+). Reason: Size of [Al(H_2O)_6]^(3+) is smaller than [Mg(H_2O)_6]^(2+) and posseses more effective nuclear charge.
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 nto the correct exaplation of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :The size of `[Al(H_(2)O)_(6)]^(3+)`is smaller than `[Mg(H_(2)O)_(6)]^(2+)` Also the former possess more EFFECTIVE nuclear charge effectively. This gives rise to relatively STRONGER ACIDIC nature of `[Al(H_(2)O)_(6)]^(3+)`.

Discussion

22.	Assertion. [Al(H_(2)O)_(6)]^(3+) is a stronger acid than [Mg(H_(2)O)_(6)]^(2+). Reason : Size of [Al(H_(2)O)_(6)]^(3+) is smaller than [Mg(H_(2)O)_(6)]^(2+) and possesses more effective nuclear charge.
Answer» If both ASSERTION and reason are TRUE, but reason is not the true explanation of the assertion If both assertion and reason are true, but reason is not the true explanation of the assertion If assertionis true, but reason is false If both assertion and reason are false Solution :R is the CORRECT explanation of A. This is because `[Al(H_(2)O)_(6)]^(3+)` has greater effective nuclear charge than `[Mg(H_(2)O)_(6)]^(2+)` and thus attracts electron pairs from donor groups more effectively. This also makes it relatively more acidic.

Discussion

23.	Assertion: Aldehydes and ketones, both react with tollens' reagent to form silver mirror. Reason: Both, aldehydes and ketones contain a carbonyl group.
Answer» Assertion and reason both are CORRECT and reason is correct explanation of assertion. Assertion and reason both are wrong STATEMENT. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Solution :Correct assertion. ALDEHYDES but not ketones react with TOLLEN's reagent to FORM silver mirror.

Discussion

24.	Assertion: Aldol condensation is usually carried out in dilute solution of a strong base. Reason: Concentrated solution of strong base involves cannizzaro reaction.
Answer» if both assertion and reson 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 reason: Only aldehydes which do not contain `alpha`-hydrogens on treatment with a concentrated solution of a base UNDERGO cannizzaro reaction.

Discussion

25.	Assertion : Alcohols have higher boiling points than ethers of comparable moleucular masses. Reason : Alcohols and ethers are isomeric in nature.
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 :Intermoleuclar H-bonding is present in ALCOHOLS ND not in EHTERS.

Discussion

26.	Assertion: Alcohols have higher boiling points than ethers of comparable molecular masses. Reason: Alcohols and ethers are isomeric in nature.
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 explanation. Alcohols have higher boiling points than those of ISOMERIC ethers DUE to PRESENCE of INTERMOLECULAR H-bonding in alcohols but not in ethers.

Discussion

27.	Assertion :Al_2O_3 is converted to aluminium by reduction with carbon. Reason :Carbon (graphite) has greater affinity for oxygen than Al.
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 :D

Discussion

28.	Assertion. Alcohols are dehydrated to hydrocarbonds in the presence of acidic zeolites. Reason. Zeolites are porous catalysts.
Answer» If both assertion and reason are ture, and reason is the trure explanation of the assertion. If both assertion and reason are TRUE, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason false. Solution :Both ASSERTIN and reason are correct but DEHYDRATIN is not due to porous NATURE but due to the acidic group present in zeolites.

Discussion

29.	Assertion : Al_(2)O_(3) is converted into Al by reduction with carbon at high temp. Reason : Carbon has greater affinity for oxygen than aluminium.
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 :C

Discussion

30.	Assertion. Al is obtained by hightemperaturereductionof aluminawithcarbon. Reason. Aluminareactswith carbon to formaluminiumcarbidewhichdecomposesat hightemperaturetofrom Al whilecarbonis oxidisedto CO.
Answer» Ifbothassertionandreasonaretrue, andreason is notthe trueexplanationofthe assertion. Ifbothassertionandreasonaretrue,butreasonis notthetrueexplanationoftheassertion. Ifassertionis true,butreason isfalse If bothassertionandreasonarefalse Solution :Correctassertion. Al isextractedbyhigh temperatureelectrolyticreductionof` Al _2 O _3 `towhichfluorsparandcryolitehavebeen ADDED. Correct reason.` Al_ 2 O_ 3 `reactswith C at HIGH TEMPERATURES to form` Al_4C_ 3`whichdoesnot decompose.

Discussion

31.	Assertion. Al_ 2O_3isconvertedintoaluminiumbyreductionwithcarbon. Reason. Carbon (graphite ) has greateraffinityfor oxygenthan aluminium.
Answer» Ifbothassertionandreasonaretrue, andreason is notthe trueexplanationofthe ASSERTION. Ifbothassertionandreasonaretrue,butreasonis notthetrueexplanationoftheassertion. Ifassertionis true,butreason isfalse If bothassertionandreasonarefalse Solution :Correctassertion.` Al_2 O_ 3 `REACTSWITH carbon athigh temperaturetoformaluminiumcarbide` (Al_ 4 C_3) ` Correct reason. Al hasgreateraffinityforoxygenthancarbon.

Discussion

32.	Assertion: AgNO_(3) reacts with KCN to form white ppt. of AgCN. This white ppt.Disappears when excess KCN is added. Reason: AgCN decomposes to form silver-carbide and evolve N_(2) gas.
Answer» 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 If assertion is FALSE but reason is true If assertion is true but the reason is false Answer :C

Discussion

33.	Assertion: AgNO_(3) reacts with KCNN to form white ppt. of AgCN. This white ppt. disappears when excess kCN is added. Reason: AgCN decomposes to form silver-carbide and evolve N_(2) gas.
Answer» If assertion is TRUE but the REASON is FALSE If assertion is false but reason is true If both assertion and reason are true and reason is the correct EXPLANATION of assertion If OTH assertion and reason are true but reason is not the correct explanation of assertion Answer :A

Discussion

34.	Assertion: Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol. Reason: Addition of water in acidic medium proceeds through the formation of primary carbocation.
Answer» ASSERTION and reason both are CORRECT and reason is correct explanation of assertion. Assertion and reason both are wrong statement. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Solution :Correct statement. ADDITION of water to but-1-ene in acidic MEDIUM YIELDS butan-2-ol. Correct reason. Adddition of water in acidic medium proceeds through the formation of secondary carbocation.

Discussion

35.	Assertion. Ag andAuare extractedby leachingtheir ores witha dilute solutionof NaCN. Reason. Impuritiesassociated with theseores dissolvesin NaCN.
Answer» Ifbothassertionandreasonaretrue, andreason is notthe trueexplanationofthe ASSERTION. Ifbothassertionandreasonaretrue,butreasonis notthetrueexplanationoftheassertion. Ifassertionis true,butreason isfalse If bothassertionandreasonarefalse SOLUTION :CORRECTREASON. Ag and Au dissolve in NaCNsolution TOFORM theirsolublecomplexes.

Discussion

36.	Assertion: After using C Cl_(4) to extinguish fire, the room must be well-ventilated. Reason: Atmospheric oxygen can convert C Cl_(4) into poisonous phosgene (COCl_(2)) gas.
Answer» If both ASSERTION and REASON are CORRECT and reason is correct EXPLANATION for assertion If both assertion and reason are correct but reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. if both assertion and reason are incorrect. Solution :Reason is the correct explanation for assertion.

Discussion

37.	Assertion : Addition of silver ions to a mixture of auqeous sodium chloride and sodum bromide solution will first precipitate AgBr rather than AgCl. Reason : K_(sp) of AgCl lt K_(sp) of AgBr.
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 :Ionic product of AGBR is greater than that of AgCl in comparison with their solubility product AgBr will precipitate. FIRST RATHER than that of AgCl.

Discussion

38.	Assertion: Addition of NaCN to a saturated solution of AgCN increases the solubility of AgCN Reason: NaCN produces common ion effect when added to a saturated solution of AgCN
Answer» Both Assertion and REASON are correct and Reason is the correct explanation on the Assertion. Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion Assertion is correct but Reason is INCORRECT Assertion is incorrect but Reason is correct Answer :B

Discussion

39.	Assertion: Addition of NH_(4)OH to an aqueous solution of BaCl_(2) in the presence of NH_(4)Cl (excess) precipitates Ba(OH)_(2) Reason: Ba(OH)_(2) in insoluble in water.
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 :Additon of `NH_(4)OH` to an aqueous solution of `BaCl_(2)` in presence of `NH_(4)Cl` (excess) does not GIVE a precipitate of `Ba(OH)_(2)` as `(Ba(OH)_(2))` is soluble in water.

Discussion

40.	Assertion Addition of Br_(2) to cis-but-2-ene is stereoselective S_(N)2 reactions are stereospecific as well as stereoselective .
Answer» <BR> Solution :A reaction is said to be stereo selective if a particular STEREOISOMER can give two or more stereoisomeric products but give one of them in greater amount than the other or even to the exclusion of the other So addition of `Br_(2)` to cis-but-2-ene is stereoselective SINCE it gives only ` (-+)2 3-`DIBROMOBUTANE .

Discussion

41.	Assertion: Addition of Br_(2) to c9s-but-2-ene is stereoselective. Reason: S_(N^(2)) reactions are stereospecific as well as stereoselective.
Answer» If both assertion and RESON 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 :A reaction is said to be stereoselective if a stereoisomeric PRODUCTS but GIVES one of them in greater amount than the other or even to the exlucsion of the other. So, adition of `Br_(2)` to cis-but-2-ene is stereoselective since it gives only `(+-)` 2,3-dibromobutane.

Discussion

42.	Assertion: Addition of Br_(2) to but-1-ene gives two optical isomers. Reason: The product contains one asymmetric carbon.
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 :RESON in the correct explanation for assertion.

Discussion

43.	Assertion. Addition of a non-volatile solute to a volatile solvent increases the boiling point. Reason. Addition of a non-volatile solute results in lowering of vapour pressure.
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 :Lowering of vapour pressure increases the boiling point as more heat is REQUIRED to MAKE vapour pressure EQUAL to atmospheric pressure. Hence, R is the correct explanation of A.

Discussion

44.	Assertion: Addition of 1,2-ethanediol to water lowers its freezing point. Reason: 1,2-Ethanediol is insoluble in water due to lack of its ability to form H-bonds with water molecules.
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 true Answer :C

Discussion

45.	Assertion: Acylation of amines gives a monosubstituted product whereas alkylation of amines gives polysubstituted product. Reason: Acyl group sterically hinders the approach of a further acyl groups.
Answer» Both ASSERTION and reason are wrong. Both assertion and reason are correct statements but reason is not correct explanation of assertion. Assertion is correct statement but reason is wrong statement. Both assertion and reason are correct statements and reason is correct explanation of assertion. Solution :Correct reason. Due to delocalization of the lone pair of electrons of the N-atom over the carbonyl group in the acyl DERIVATIVE, the electron density on the N-atom decreases to such an EXTENT that it does not act as a nucleophile at all and hence does not react with another molecule of the acylating agent.

Discussion

46.	Assertion. Activity of an enzyme is pH-dependent. Reason. Change in pH affects the solubility of the enzyme in water.
Answer» If both assertion and REASON are ture, and reason is the trure explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason false. Solution :ACTIVITY of enzyme INCREASES with increase in pH and is maximum of pH of 7.4 and then falls off. Hence assertion CORRECT. Correct explanation, With changein pH,the external of protonation of the bases CHARGES.

Discussion

47.	Assertion. Actinoidsshow larger number of oxidation states than lanthanoids. Reason. Highest oxidation state showsn by lanthanoids is +4 while that of actinoids is +7
Answer» Solution :Correct explanation . Due to lanthanoid between 4f and 5D SUBSHELLS is large while in case of actinoids,energy GAP between 5f, 6d and 7s SUBSHELL is very small.

Discussion

48.	Assertion :Activating groups are electron donors. Reason: Nitroso group is activating group
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 assertion and reason both are false Solution :Like halogens , the nitroso group (-N=O) is ALSO deactivating but o, p-directing. It is deactivating because O is more electronegative than N and hence NO group as whole withdraws ELECTRONS from the benzene ring

Discussion

49.	Assertion : Actinoids from relatively less stable complexes as compared to lanthanoids. Reason : Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding bu lanthanoids do not use their 4f orbital for bonding.
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 correc explanation of assertion. Assertion is not true for reason is true Both assertion and reason are false. Solution :Correct ASSERTON. Actinoids form relatively more stable COMPLEXES than lanthanoids ( as the latter have low CHARGE density )

Discussion

50.	Assertion (A):Clay is an ore of aluminium while bauxite is not. (R ): Aluminium can be economically extracted from bauxite not from clay.
Answer» A and R are CORRECT R 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 :d

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion : Alpha (alpha) amino acids exist as internal slat in solution as they have amino acid and carboxylic acid groups in near vicinity. Reason : H^(+) ion given by carboxyl group (-COOH) is captured by amino group (-NH_2) having lone pair of electrons.

Assertion: alpha-amino acids exist as dipolar ions or zwitter ion. Reason: alpha-amino acids are the building blocks of proteins.

Assertion : All the ores are mineral.

Assertion : All naturally occuring alpha-amino acids expect glycine are optically active. Reason : Most naturally occuring amino acids have L-configuration.

Assertion: All naturally occuring alpha-amino acids are optically activeReason: Most naturally occuring amino acids have D-configuration.

Assertion. All F-S-F bond angles in SF_(4) are greater than 90^(@) but less than 180^(@) Reason. The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion.

Assertion: All enzymes found in cells are invariably proteins which catalyse biological reactions.Reason : Enzymes act efficiently at a moderate temperature and pH.

Assertion : All enzymes are proteins but all proteins are not enzymes. Reason : Enzymes are biocatalysts and posses a stable configuration having an active site pocket.

Assertion : All diatomic molecules with polar bond have dipole moment. Reason : Dipole moment is a vector quantity.

Assertion : All collisions of reactant molecules lead to product formation. Reason : Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

Assertion : All collision of reactant molecule lead to product formation. Reason : Product formation is independent of oriendation of the reactant moleucles.

Assertion: All amino acids exists as Zwitter ions. Reason: Amino acids have both - NH_(2) and -COOH group

Assertion : All aldehydes donot take part in aldol condensation. Reason : In th aldol condensation, carbanion is generated by the abstraction of alpha-H atopm by the base.

Assertion: Alkyl iodide can be prepared by treating alkyl chloride/bromide with NaI in acetone. Reason: NaCl/NaBr are soluble in acetone while NaI is not.

Assertion: Alkyl halides are soluble in organic solvents. Reason: p-dichlorobenzene possesses low melting point.

Assertion: Alkyl cyanides and alkyl isocyanides have much higher boiling points than corres- ponding alkyl halides. Reason : Cyanides and isocyanides are much more polar than alkyl halides.

Assertion: Alkaline hydrolysis of ester is known as saponification. Reason: Alkaline hydrolysis of ester is a first order reaction. Reason: Alkaline hydrolysis of ester is a first order reaction.

Assertion : Alkali metals cannot be prepared by the electrolysis of aq. MgCl_2 . Reason : The reduction potential of Mg^(2+)is much lower than that of H^(+).

Assertion: alkali earth metals have lower densities than alkali metals. Reason: atomic radii of alkaline earth metals are smaller than that of corresponding alkali metals.

Assertion. [Al(H_(2)O)_(6)]^(3+) is a stronger acid than [Mg(H_(2)O)_(6)]^(2+). Reason : Size of [Al(H_(2)O)_(6)]^(3+) is smaller than [Mg(H_(2)O)_(6)]^(2+) and possesses more effective nuclear charge.

Assertion: Aldehydes and ketones, both react with tollens' reagent to form silver mirror. Reason: Both, aldehydes and ketones contain a carbonyl group.

Assertion: Aldol condensation is usually carried out in dilute solution of a strong base. Reason: Concentrated solution of strong base involves cannizzaro reaction.

Assertion : Alcohols have higher boiling points than ethers of comparable moleucular masses. Reason : Alcohols and ethers are isomeric in nature.

Assertion: Alcohols have higher boiling points than ethers of comparable molecular masses. Reason: Alcohols and ethers are isomeric in nature.

Assertion :Al_2O_3 is converted to aluminium by reduction with carbon. Reason :Carbon (graphite) has greater affinity for oxygen than Al.

Assertion. Alcohols are dehydrated to hydrocarbonds in the presence of acidic zeolites. Reason. Zeolites are porous catalysts.

Assertion : Al_(2)O_(3) is converted into Al by reduction with carbon at high temp. Reason : Carbon has greater affinity for oxygen than aluminium.

Assertion. Al is obtained by hightemperaturereductionof aluminawithcarbon. Reason. Aluminareactswith carbon to formaluminiumcarbidewhichdecomposesat hightemperaturetofrom Al whilecarbonis oxidisedto CO.

Assertion. Al_ 2O_3isconvertedintoaluminiumbyreductionwithcarbon. Reason. Carbon (graphite ) has greateraffinityfor oxygenthan aluminium.

Assertion: AgNO_(3) reacts with KCN to form white ppt. of AgCN. This white ppt.Disappears when excess KCN is added. Reason: AgCN decomposes to form silver-carbide and evolve N_(2) gas.

Assertion: AgNO_(3) reacts with KCNN to form white ppt. of AgCN. This white ppt. disappears when excess kCN is added. Reason: AgCN decomposes to form silver-carbide and evolve N_(2) gas.

Assertion: Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol. Reason: Addition of water in acidic medium proceeds through the formation of primary carbocation.

Assertion. Ag andAuare extractedby leachingtheir ores witha dilute solutionof NaCN. Reason. Impuritiesassociated with theseores dissolvesin NaCN.

Assertion: After using C Cl_(4) to extinguish fire, the room must be well-ventilated. Reason: Atmospheric oxygen can convert C Cl_(4) into poisonous phosgene (COCl_(2)) gas.

Assertion : Addition of silver ions to a mixture of auqeous sodium chloride and sodum bromide solution will first precipitate AgBr rather than AgCl. Reason : K_(sp) of AgCl lt K_(sp) of AgBr.

Assertion: Addition of NaCN to a saturated solution of AgCN increases the solubility of AgCN Reason: NaCN produces common ion effect when added to a saturated solution of AgCN

Assertion: Addition of NH_(4)OH to an aqueous solution of BaCl_(2) in the presence of NH_(4)Cl (excess) precipitates Ba(OH)_(2) Reason: Ba(OH)_(2) in insoluble in water.

Assertion Addition of Br_(2) to cis-but-2-ene is stereoselective S_(N)2 reactions are stereospecific as well as stereoselective .

Assertion: Addition of Br_(2) to c9s-but-2-ene is stereoselective. Reason: S_(N^(2)) reactions are stereospecific as well as stereoselective.

Assertion: Addition of Br_(2) to but-1-ene gives two optical isomers. Reason: The product contains one asymmetric carbon.

Assertion. Addition of a non-volatile solute to a volatile solvent increases the boiling point. Reason. Addition of a non-volatile solute results in lowering of vapour pressure.

Assertion: Addition of 1,2-ethanediol to water lowers its freezing point. Reason: 1,2-Ethanediol is insoluble in water due to lack of its ability to form H-bonds with water molecules.

Assertion: Acylation of amines gives a monosubstituted product whereas alkylation of amines gives polysubstituted product. Reason: Acyl group sterically hinders the approach of a further acyl groups.

Assertion. Activity of an enzyme is pH-dependent. Reason. Change in pH affects the solubility of the enzyme in water.

Assertion. Actinoidsshow larger number of oxidation states than lanthanoids. Reason. Highest oxidation state showsn by lanthanoids is +4 while that of actinoids is +7

Assertion :Activating groups are electron donors. Reason: Nitroso group is activating group

Assertion : Actinoids from relatively less stable complexes as compared to lanthanoids. Reason : Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding bu lanthanoids do not use their 4f orbital for bonding.

Assertion (A):Clay is an ore of aluminium while bauxite is not. (R ): Aluminium can be economically extracted from bauxite not from clay.