94420 + Interview Questions in Chemistry in Class 12

1.	Assertion (A) : Benzyl amine is more basic than aniline. Reason (R) : Positive inductive effect of phenyl group creates high electron density around N atom.
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 :C

Discussion

2.	Assertion (A) : Benzonitrile is prepared by the reaction of chlorobenzene with KCN. Reason (R) : Cyanide (CN^(-)) is a strong nucleophile.
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 :D

Discussion

3.	Assertion (A) : Benzoic acid does not undergo friedel crafts reaction. Reason (R ): This is due to the strong deactivating nature of the carboxyl group
Answer» Both A andare CORRECT and R is the correct EXPLANATION of A. Both A andare correct and R is not the correct explanation of A. A is correct but R is WRONG A is wrong but R is correct Solution :Both A andare correct and R is the correct explanation of A.

Discussion

4.	Assertion (A) : Benzoic acid does not undergo Friedal-Crafts reaction. Reason (R ) : The carboxyl group is activating and undergo electrophilic substitution reaction.
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

5.	Assertion : A beam of electrons deflect more than a beam of alpha-particles in an electric field Reaosn : Electrons possess negative charge while alpha particles possess positive 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 not the correct explanantion of the assertion If assertion is true but reason is false If the assertion and reason both are false Solution :The ACTIVITY of 1g of PURE `U - 235` and that in `U_(3)O_(8)` is same. Activity does not depend upon the state of COMBINATION

Discussion

6.	Assertion (A) : Bauxite is purified by leaching. Reason (S) : Aluminium oxide reacts with sodium hydroxide to form soluble sodium meta aluminate.
Answer» Both A and R are CORRECT STATEMENT, and R is the correct EXPLANATION of the A. Both A and R are correct statement, but R is not the correct explanation of the A. A is correct, but the R is INCORRECT statement. A is incorrect, but the R is correct statement. Answer :A

Discussion

7.	Assertion (A) : Benzene diazonium chloride is a coloured gas. Reason (R) : Direct nitration of aniline yields tarry oxidation product.
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

8.	Assertion (A) : Batteries and fuel cells convert chemical energy into electrical energy. Reason (R) : The reactions carried out electrochemically are not energy efficient and more polluting.
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

9.	Assertion (A) : Bakelite is a thermosetting polymer. Reason (R ) : On heating, polymeric chain becomes long and straight chain.
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

10.	Assertion (A) : BaCl_2 (aq) gives white ppt. of BaS with a solution containing S^(2-) ions. Reason (R) :BaS is a white coloured insoluble compound
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 Both A and R are false Solution :`BaCl_2` (AQ) cannot be used to TEST for `S^(2-)` as BaS is soluble in WATER.

Discussion

11.	Assertion (A) : B_(2) O_(3) has trigonal planar structure. Reason (R) : The ratio of radius of cation and anion (r_(c^(+)))/(r_(A^(-)))=0.155-0.225plays an important role in determining the structure and B_(2) O_(3) has coordination number as 3 and has trigonal planar structure.
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 :Both A and R are correct and R is the correct explanation of A.

Discussion

12.	Assertion (A): B group vitamins and vitamin C must be taken regularly in diet. Reason (R) : Vitamin B and Vitamin C are water soluble and are readily excreted in urine.
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 :A

Discussion

13.	Assertion (A) : Au and Ag are extracted by leaching their ores with a dil. Solution of NaCN. Reason (R ) : Impurities associated with these ores dissolve in NaCN.
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 :C

Discussion

14.	Assertion (A): Atomic radii from Cr to Cu is almost similar Reason (R ): Sheilding effect of entering electron in 3d-orbital decrease repulsion forces of 4s-orbital electrons towards nucleus
Answer» (A) and (R ) both are true (R ) is CORRECT EXPLANATION of (A) (A) is true, (R ) is wrong (A) and (R ) both are true (A) is wrong (R ) is true Answer :B

Discussion

15.	Assertion (A) : At equilibrium, there is a separation of charges and depending upon the tendencies of two opposing reactions, the electrode may be positively or negatively charged with respect to the solution. Reason (R) : At each electrode-electrolyte interface, there is a tendency of the metal ions from the solution to deposit on the metal and metal atoms of the electrode to go into the solution leaving behind electrons on the electrode.
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

16.	Assertion (A) : At isoelectric point, the amino acid does not migrate under the influence of electrical field. Reason (R) : The amino acid molecule at the isoelectric point exerts as zwitter ion structure.
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

17.	Assertion (A) : As the pressure on water increased it's freezing point decreases.Reason (R ) : Density of water at 273 K is maximum.
Answer» Assertion and REASON both are CORRECT STATEMENTS 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 and reason both are INCORRECT statements. Answer :C

Discussion

18.	Assertion (A) : As a lead storage battery gets discharged, density of electrolyte present in decreases. Reason (R) : Lead and Lead dioxide both react with sulphuric acid to form lead sulphate.
Answer» Both A and R are CORRECT Both A and R are WRONG A is correct but R is wrong A is wrong but R is correct ANSWER :A

Discussion

19.	Assertion (A) : Aryl iodides cab be prepared by reaction of arenes with iodine in the presence of an oxidising agent.Reason (R ) : Oxidising agent oxidises I_(2) into HI.
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 is wrong but reason is correct statement. SOLUTION :OXIDIZING agent oxidizes HI to `I_(2)`.

Discussion

20.	Assertion (A) : Artificial sweeteners are added to the food to control the intake of calories. Reason (R) : Most of the artificial sweeteners are inert and do not metabolise in the body.
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

21.	Assertion (A) : Arrhenius equation explains the temperature dependence of rate of a chemical reaction. Reason (R ) : Plot of log k versus 1//T are linear and energy of activationis obtained from such graphs.
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

22.	Assertion (A) : Aromatic carboxylic acids do not undergo Friedel Crafts reaction. Reason (R) : AlCl_(3) is Lewis acid and gets bounded to carboxyl group.
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

23.	Assertion (A): Aromatic 1^(@) amines can be prepared by Gabriel phthalimide synthesis. Reason(R):Aryl haliodes undergo nucleophilic substitution with the anion formed by phthalimide.
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 :B

Discussion

24.	Assertion (A): Aquous solution of raw sugar, when passed over beds of animal charcoal, becomes colourless. Reason (R) : Colouring substances does not absorbed by the charcoal.
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 true and Reason (R) is false. Solution :Assertion (A) is true and Reason (R) is false.

Discussion

25.	Assertion (A): Antioxidant such as butyl hydroxy toluene (BHT) and butylated hydroxy anisole (BHA) are added as good additives. Reason (R): Antioxidants retard the oxidative deterioration of food which contain fat and oils is easily oxidised and turn rancid.
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A. Both A and R are correct but R does not EXPLAIN A. A is correct but R is WRONG. A is wrong but R is correct. Answer :A

Discussion

26.	Assertion (A) : Anisole reacts with HI to give phenol and methyl iodide. Reason (R): The strong C-O bond in anisole does not cleave so methanol is never formed.
Answer» (A) and (R) are TRUE and (R) is the correct explanation of (A). Both (A) and (R) are true but (R) does not explain (A) (A) is true but (R) is FALSE Both (A) and (R) are false Answer :A

Discussion

27.	Assertion (A) : Aniline reacts with Br_2"/"H_2O to give a white precipitate of 2,4,6-tribromoaniline. Reason (R ) : Aniline is resonance stabilized.
Answer» (A) and (R ) are true and (R ) is the CORRECT explaination 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) : Aniline is less basic than NH_3. Reason (R ) : Greater the value of pK_b, stronger is the base.
Answer» (A) and (R ) are TRUE and (R ) is the correct explaination 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

29.	Assertion (A): Aniline reacts with acids to form salts and also reacts with electrophiles. Reason(R):The lone pair of electrons on nitrogen atom in amines makes them basic as well as nucleophilic.
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

30.	Assertion (A) : Aniline is a weaker base than p-anisidine. Reason (R) : The benzene ring in aniline exerts a +R eefect.
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 :C

Discussion

31.	Assertion (A) : Aniline is a weaker base than ammonia. Reason (R) : Aniline is resonance stabilised.
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

32.	Assertion (A): Aniline does not undergo Friedel -Crafts reaction. Reason (R):Aniline donates its lone pair of electrons to the Lewis acid AlCl_(3) to form an adduct which inhibits further electrophilic substitution reaction.
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

33.	Assertion (A) : Aniline decolourises bromine water with the formation of white precipitate which is TNT. Reason (R ) : Electrophilic substitution reaction proceed under milder conditions in aniline because of the activated benzene ring.
Answer» (A) and (R ) are TRUE and (R ) is the CORRECT explaination 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

34.	Assertion (A) : Aniline couples with NaNO_2"/"HCl to give beta-Naphthol which is a blue colour precipitate. Reason (R ) : The colour of the compound is due to conjugation of the ring.
Answer» (A) and (R ) are TRUE and (R ) is the correct EXPLAINATION 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 :D

Discussion

35.	Assertion (A): Aniline cannot be prepared by Gabriel phthalimide synthesis. Reason(R):Arylhalides do not undergo nucleophilic substitution with the anion formed by phthalimide.
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

36.	Assertion (A) : An ordinary filter paper impregnated with collodian solution stops the flow of colloidal particles. Reason (R) : Pore size of the filter paper becomes more than the size of colloidal particles.
Answer» Assertion and reason are correct and reason is correct explanation of assertion. Assertion and reason both are correct but reason does not EXPLAIN assertion. Assertion is correct but reason is incorrect. Both assertion and reason are incorrect. SOLUTION :Assertion is correct but reason is incorrect. Pore size of FILTER paper decreases. THUS, colloidal particles do not flow through it.

Discussion

37.	Assertion (A) : Amorphous solids are isotropic in nature. Reason (R) : In amorphous solids, they have identical values of physical properties such as refractive index, electrical conductance in all directions which is called isotropy.
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 :Both A and R are correct and R is the correct explanation of A.

Discussion

38.	Assertion (A) : Ammonolysis of alkyl halides mainly produces 2^(@) amines. Reason (R) : Ammonolysis of halids involves the reaction between alkyl halides and alcoholic ammonia.
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 :D

Discussion

39.	Assertion (A): Amines have lower boiling point than alcohols. Redason(R):Nitrogen has lower electronegative value than oxygen and hence the N-H bond is less polar than -OH bond.
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

40.	Assertion (A) : Amines can be considered as derivatives of ammonia. Reason (R): Quaternary ammonium salts are used as surfactants.
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) : Amines being basic in nature react with acids to form salts. Reason (R) : Aromatic amines are stronger bases than ammonia.
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

42.	Assertion (A) : Amides give primary amines with hydrobromides. Reason (R): The reaction of amides with alkali is a qualitative test for CONH_(2) group.
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

43.	Assertion (A) : Amines are more basic than ethers and esters. Reason (R) : Nitrogen is less electronegative than oxygen, it is in better position to accommodate the positive charge on the proton.
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

44.	Assertion (A) : Aluminium is used in the design of chemical reactors, medical equipments, refrigeration units and gas pipelines. Reason (R ) : Aluminium show high resistance to corrosion.
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

45.	Assertion (A): Aluminium can be used as a reducing agent for the reduction of chromic oxide. Reason(R ):In the Elligham diagram ,formation of chromium oxide lies diagram,formation of chromium oxide lies above that of the aluminium,therefore Al_(2)O_(3) is more stable than Cr_(2)O_(3)
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

46.	Assertion (A) : Alum is added to muddy water to coagulate the suspended impurities and make water fit for drinking. Reason (R) : Latex is a colloidal solution of rubber particles which are positively charged.
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

47.	Assertion (A) : Almostall carbohydratesare optically active . Reason (R) : Allcarbohydrates have oneor morechiralcarbonatoms.
Answer» BothAand RARE CORRECT and RIS the correctexplanation OFA . BothA and Rare correctbutR is notthe correct EXPLANATIONOF A A is correctbut R is wrong A is wrongbut Ris correct . Answer :A

Discussion

48.	Assertion (A) : All the noble gases have ns^(2)np^(6) electronic configuration in their valence shell. Reason (R) : Atomic radii increase down with increase in atomic number.
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 RENSON (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

49.	Assertion (A) : All the amines, except tertiary amines are capable of forming intermolecular hydrogen bonds. Reason (R) : Tertiary amines have larger molecules and surface area.
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 :C

Discussion

50.	Assertion (A) : All naturally occurring a-amino acids except glycine are optically active. Reason (R) : Most naturally occurring amino To 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 statement, but reason does not explain assertion. Solution :Assertion and reason both are correct statement, but reason does not explain assertion. All `alpha`-amino ACIDS except glycine contain at LEAST one chiral CARBON.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion (A) : Benzyl amine is more basic than aniline. Reason (R) : Positive inductive effect of phenyl group creates high electron density around N atom.

Assertion (A) : Benzonitrile is prepared by the reaction of chlorobenzene with KCN. Reason (R) : Cyanide (CN^(-)) is a strong nucleophile.

Assertion (A) : Benzoic acid does not undergo friedel crafts reaction. Reason (R ): This is due to the strong deactivating nature of the carboxyl group

Assertion (A) : Benzoic acid does not undergo Friedal-Crafts reaction. Reason (R ) : The carboxyl group is activating and undergo electrophilic substitution reaction.

Assertion : A beam of electrons deflect more than a beam of alpha-particles in an electric field Reaosn : Electrons possess negative charge while alpha particles possess positive charge

Assertion (A) : Bauxite is purified by leaching. Reason (S) : Aluminium oxide reacts with sodium hydroxide to form soluble sodium meta aluminate.

Assertion (A) : Benzene diazonium chloride is a coloured gas. Reason (R) : Direct nitration of aniline yields tarry oxidation product.

Assertion (A) : Batteries and fuel cells convert chemical energy into electrical energy. Reason (R) : The reactions carried out electrochemically are not energy efficient and more polluting.

Assertion (A) : Bakelite is a thermosetting polymer. Reason (R ) : On heating, polymeric chain becomes long and straight chain.

Assertion (A) : BaCl_2 (aq) gives white ppt. of BaS with a solution containing S^(2-) ions. Reason (R) :BaS is a white coloured insoluble compound

Assertion (A) : B_(2) O_(3) has trigonal planar structure. Reason (R) : The ratio of radius of cation and anion (r_(c^(+)))/(r_(A^(-)))=0.155-0.225plays an important role in determining the structure and B_(2) O_(3) has coordination number as 3 and has trigonal planar structure.

Assertion (A): B group vitamins and vitamin C must be taken regularly in diet. Reason (R) : Vitamin B and Vitamin C are water soluble and are readily excreted in urine.

Assertion (A) : Au and Ag are extracted by leaching their ores with a dil. Solution of NaCN. Reason (R ) : Impurities associated with these ores dissolve in NaCN.

Assertion (A): Atomic radii from Cr to Cu is almost similar Reason (R ): Sheilding effect of entering electron in 3d-orbital decrease repulsion forces of 4s-orbital electrons towards nucleus

Assertion (A) : At isoelectric point, the amino acid does not migrate under the influence of electrical field. Reason (R) : The amino acid molecule at the isoelectric point exerts as zwitter ion structure.

Assertion (A) : As the pressure on water increased it's freezing point decreases.Reason (R ) : Density of water at 273 K is maximum.

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

Assertion (A) : Aryl iodides cab be prepared by reaction of arenes with iodine in the presence of an oxidising agent.Reason (R ) : Oxidising agent oxidises I_(2) into HI.

Assertion (A) : Artificial sweeteners are added to the food to control the intake of calories. Reason (R) : Most of the artificial sweeteners are inert and do not metabolise in the body.

Assertion (A) : Arrhenius equation explains the temperature dependence of rate of a chemical reaction. Reason (R ) : Plot of log k versus 1//T are linear and energy of activationis obtained from such graphs.

Assertion (A) : Aromatic carboxylic acids do not undergo Friedel Crafts reaction. Reason (R) : AlCl_(3) is Lewis acid and gets bounded to carboxyl group.

Assertion (A): Aromatic 1^(@) amines can be prepared by Gabriel phthalimide synthesis. Reason(R):Aryl haliodes undergo nucleophilic substitution with the anion formed by phthalimide.

Assertion (A): Aquous solution of raw sugar, when passed over beds of animal charcoal, becomes colourless. Reason (R) : Colouring substances does not absorbed by the charcoal.

Assertion (A): Antioxidant such as butyl hydroxy toluene (BHT) and butylated hydroxy anisole (BHA) are added as good additives. Reason (R): Antioxidants retard the oxidative deterioration of food which contain fat and oils is easily oxidised and turn rancid.

Assertion (A) : Anisole reacts with HI to give phenol and methyl iodide. Reason (R): The strong C-O bond in anisole does not cleave so methanol is never formed.

Assertion (A) : Aniline reacts with Br_2"/"H_2O to give a white precipitate of 2,4,6-tribromoaniline. Reason (R ) : Aniline is resonance stabilized.

Assertion (A) : Aniline is less basic than NH_3. Reason (R ) : Greater the value of pK_b, stronger is the base.

Assertion (A): Aniline reacts with acids to form salts and also reacts with electrophiles. Reason(R):The lone pair of electrons on nitrogen atom in amines makes them basic as well as nucleophilic.

Assertion (A) : Aniline is a weaker base than p-anisidine. Reason (R) : The benzene ring in aniline exerts a +R eefect.

Assertion (A) : Aniline is a weaker base than ammonia. Reason (R) : Aniline is resonance stabilised.

Assertion (A): Aniline does not undergo Friedel -Crafts reaction. Reason (R):Aniline donates its lone pair of electrons to the Lewis acid AlCl_(3) to form an adduct which inhibits further electrophilic substitution reaction.

Assertion (A) : Aniline decolourises bromine water with the formation of white precipitate which is TNT. Reason (R ) : Electrophilic substitution reaction proceed under milder conditions in aniline because of the activated benzene ring.

Assertion (A) : Aniline couples with NaNO_2"/"HCl to give beta-Naphthol which is a blue colour precipitate. Reason (R ) : The colour of the compound is due to conjugation of the ring.

Assertion (A): Aniline cannot be prepared by Gabriel phthalimide synthesis. Reason(R):Arylhalides do not undergo nucleophilic substitution with the anion formed by phthalimide.

Assertion (A) : An ordinary filter paper impregnated with collodian solution stops the flow of colloidal particles. Reason (R) : Pore size of the filter paper becomes more than the size of colloidal particles.

Assertion (A) : Amorphous solids are isotropic in nature. Reason (R) : In amorphous solids, they have identical values of physical properties such as refractive index, electrical conductance in all directions which is called isotropy.

Assertion (A) : Ammonolysis of alkyl halides mainly produces 2^(@) amines. Reason (R) : Ammonolysis of halids involves the reaction between alkyl halides and alcoholic ammonia.

Assertion (A): Amines have lower boiling point than alcohols. Redason(R):Nitrogen has lower electronegative value than oxygen and hence the N-H bond is less polar than -OH bond.

Assertion (A) : Amines can be considered as derivatives of ammonia. Reason (R): Quaternary ammonium salts are used as surfactants.

Assertion (A) : Amines being basic in nature react with acids to form salts. Reason (R) : Aromatic amines are stronger bases than ammonia.

Assertion (A) : Amides give primary amines with hydrobromides. Reason (R): The reaction of amides with alkali is a qualitative test for CONH_(2) group.

Assertion (A) : Amines are more basic than ethers and esters. Reason (R) : Nitrogen is less electronegative than oxygen, it is in better position to accommodate the positive charge on the proton.

Assertion (A) : Aluminium is used in the design of chemical reactors, medical equipments, refrigeration units and gas pipelines. Reason (R ) : Aluminium show high resistance to corrosion.

Assertion (A): Aluminium can be used as a reducing agent for the reduction of chromic oxide. Reason(R ):In the Elligham diagram ,formation of chromium oxide lies diagram,formation of chromium oxide lies above that of the aluminium,therefore Al_(2)O_(3) is more stable than Cr_(2)O_(3)

Assertion (A) : Alum is added to muddy water to coagulate the suspended impurities and make water fit for drinking. Reason (R) : Latex is a colloidal solution of rubber particles which are positively charged.

Assertion (A) : Almostall carbohydratesare optically active . Reason (R) : Allcarbohydrates have oneor morechiralcarbonatoms.

Assertion (A) : All the noble gases have ns^(2)np^(6) electronic configuration in their valence shell. Reason (R) : Atomic radii increase down with increase in atomic number.

Assertion (A) : All the amines, except tertiary amines are capable of forming intermolecular hydrogen bonds. Reason (R) : Tertiary amines have larger molecules and surface area.

Assertion (A) : All naturally occurring a-amino acids except glycine are optically active. Reason (R) : Most naturally occurring amino To acids have L-configuration.