94420 + Interview Questions in Chemistry in Class 12

1.	Assertion (A) : [Co(NH_(3))_(5)(SO_(4))]Br and [Co(NH_(3))_(5)Br]SO_(4) are examples of ionisation isomerism. Reason (R) : Hydrate isomers have water molecules only as water of crystallisation.
Answer» Both ASSERTION (A) and Reason (R) are correct STATEMENTS, and Reason (R) is the correct explation of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explation 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

2.	Assertion (A): Conductivity of an electrolyte increases with decrease in concentration. Reason (R ): Number of ions per unit volume decreases on dilution.
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

3.	Assertion (A) : Conductivity of an electrolyte depends upon the size of the ions produced andtheir solvation. Reason (R) : Conductivity of an electrolyte does not depend upon temperature.
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

4.	Assertion :A concetrated solutionof BiCI_(3) can be easilly diluted to any extenty withwater Reasion : BiCI_(3) does notcahngein compositionwith dilution
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 :`BiCI_(2)` gas hydrolysed in a LARGE volume of WATERSO a concentrated solution of itcannot be diluted `BiCI_(3) + H_(2)O `rarr `overset(BiOCl darr)underset((white))` + `2HCI`

Discussion

5.	Assertion (A) : Conductivity of an electrolyte decreases with decrease in concentration. Reason ( R ) : Number of ions per unit volume increases on dilution.
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

6.	Assertion (A): Condensation polymerisation progresses step by step and is also called step growth polymerisation.Reason (R) : Polypropene is used in the manufacture of ropes, toys, pipes and fibres.
Answer» Both Assertion (A) and Reason (R) are correct statements, and Rerson (R) is the correct EXPLANATION of the Assertion (A) Both Assertion (A) and RESON (R) are correct statements, but Reson (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

7.	Assertion (A) : Conc. H_2SO_4 cannot be used to prepare HI from KI. Reason (R) :Conc. H_2SO_4 is a strong oxidising agent.
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 Solution :Both ASSERTION (A) and REASON (R) are true and R is the correct explanation of A.

Discussion

8.	Assertion (A): Compounds with two hydroxy groups are gem diols. Reason (R): Ethanol which contains 5% methanol is known s methylated spirit.
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

9.	Assertion (A) : Complexes of central metal atom such as of Cu^(+), Zn^(2+), SC^(3+), Ti^(4+) are colourless. Reason (R ) : Cu^(+), Zn^(2+), SC^(3+), Ti^(4+) are having d^(0) or d^(10) configuration and because of it, d-d transition is not possible and so they are colourless.
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. Both A and R are wrong A is correct but R is wrong Answer :A

Discussion

10.	Assertion (A): Competitive inhibitors compete with natural substrate for their attachment on the active sites of enzymes. Reason (R): In competitive inhibition, inhibitor binds to the allosteric site of the enzyme.
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. Correct reason : In COMPETITIVE inhibition INHIBITOR binds to the active SITE of the enzyme.

Discussion

11.	Assertion (A) Competitive inhibitors compete with natural substrate for their attachement on the active sites of enzymes. Reason (R) In competitive inhibitor binds to the allosteric site of the enzyme.
Answer» If both ASSERTION and reason are TRUEAND reason is the correct explanationof assertion . If both assertion and reason are true but reason is not the correct explanationof assertion . If assertion is true but reason is FALSE. If both assertion and reason are false. Solution :Some drugs do not bindto the ENZYME's activesite but BIND to allosteric site .

Discussion

12.	Assertion (A) : Common name of CH_(3) - CHCl_(2) is ethylidene chloride. Reason (R) As we go down the group in the Periodic Table, the size of halogen atom decreases.
Answer» Both Assertion (A) and RESORT (R) are correct statements, quid REASON (R) is the correct EXPLANATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, brit 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 Renson (R) is correct statement. Answer :C

Discussion

13.	Assertion (A) : Combustion of 16 g of methane gives 18 g of water. Reason (R) : In the combusition of methane, water is one of the products.
Answer» Both A and are true but R is not 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 :Correct A. COMBUSTION of 16 g of methane gives 6 g of water `(CH_(4)+2O_(2)RARR CO_(2)+2H_(2)O)`.

Discussion

14.	Assertion (A) : Colloidal solutions show colligative properties. Reason (R) : Colloidal particles are large in size.
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 and reason both are correct but reason does not explain assertion. Due to large size of colloidal particles, it shows lesser COLLIGATIVE PROPERTIES.

Discussion

15.	Assertion (A) : Colloidal solutions do not show Brownian motion. Reason (R) : Brownion motion is responsible for stability of sols.
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 incorrect but reason is correct.

Discussion

16.	Assertion (A) : Coagulation power of Al^(3+) is more than Na^(+). Reason (R) : Greater the valency of the flocculating ion added, greater is its power to cause precipitation. (Hardy-Schulze Rule)
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 and reason are correct and reason is correct explanation of assertion.

Discussion

17.	Assertion: A cis-isomer has a net dipole moment zero. Reason: cis- isomers has two ligands of the different type occupying adjacent positions.
Answer» Both Assertion & REASON are TRUE ,Reason is the correct explanation of Assertion Both Assertion & Reason are true, Reason is not correct explanation of Assertion Assertion is true , Reason is FALSE Assertion is false , Reason is false ANSWER :D

Discussion

18.	Assertion (A) : Chromatography is a very effective method and used for identification, detection and estimation of micro quantities of many substances. Reason (R): Chromatography technique is applied for separation and detection of components in a mixture it is mainly based on adsorption of components on the surface of adsorbents.
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A. Both A and R are correct. A is correct but R is WRONG. A is wrong but R is correct. Answer :A

Discussion

19.	Assertion (A) : Chemisorption is highly specific and occurs only when there is a possibility of chemical bond formation. Reason (R) : Freundlich adsorption isotherm is given by the equation x/m = kp^(1//n) ( n gt 1)
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

20.	Assertion (A) : Chemical messengers are chemicals that enable communication of message between two neurons or between neurons and muscles. Reason (R) : Chemicals enter the cell through receptor.
Answer» Assertion and reason both are CORRECT statement but reason does not explain assertion. Assertion and reason both are correct and reason explains the assertion. Both assertion and reason are wrong statement. Assertion is correct statement reason is wrong statement. Solution :Assertion is correct statement reason is wrong statement. Correct reason : CHEMICALS BIND to the receptors sites present on the surface of the membrane or the CELL. They give MESSAGE to the cell. Without entering the cell.

Discussion

21.	Assertion (A) Chemical messengers are chemicals that enable communications of message between tow neurons or between or between neurons and muscles. Reason (R) Chemicals enter the cell through receptor.
Answer» If both assertion and REASON are trueand reason is the correct EXPLANATIONOF assertion . If both assertion and reason are true but reason is not the correct explanationof assertion . If assertion is true but reason is false. If both assertion and reason are false. SOLUTION :Chemicals bind to the receptor SITES present on the surface of the membrane of the CELL.

Discussion

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

Discussion

23.	Assertion (A) : Chemical adsorption is an exothermic process. Reason (R) : In chemical adsorption, gas molecules are held to the surface by formation of chemical bonds. Since strong bond is formed, nearly 400kJ/mole is given out as heat adsorption.
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 correct explanation of A. Both A and R are wrong. A is correct but R is wrong. Answer :A

Discussion

24.	Assertion (A) : (CH_(3))_(3)N boils at 276 K while CH_(3)CH_(2)CH_(2)NH_(2) at 322 K through both have same molecular mass. Reason (R) : Molecules of CH_(3)CH_(2)CH_(2)NH_(2) form hydrogen bonds while (CH_(3))_(3)N molecules are incapable of forming hydrogen bonds.
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

25.	Assertion (A) :(CH_3)_3 C-O - CH_3 gives (CH_3)_3 C-I and CH_3 OH on treatment with HI. Reason (R ) : The reaction occurs by S_(N)1mechanism.
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

26.	Assertion (A): (CH_(3))_(2)-underset(CH_(3))underset(\|)C-OH + HCl overset("anhy")underset(ZnCl_(2)) to No reaction at Room temperature Reason(R): (CH_(3))_(2)-underset(CH_(3))underset(\|)C-OH + HCl is a secondary alcohol.
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 :D

Discussion

27.	Assertion : A certain element X, forms binary compounds with chlorine containing 59.68%, 68.95 % and 74.75% chlorine respctively. These data illustrate the law of multiple proportions. Reason : According to law of multiple proportions, the relative amount of an element combining with some fixed amount of a second element in a series of compounds are the ratios of small whole numbers.
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 :Both assertion and reason are true and reason is the correct explanation of assertion.

Discussion

28.	Assertion (A) : Catalyst presence increase the rate the reaction Reason (R) : in the presence of a catalyst , energy of activation is lowered and hence greater number of molecules can across the energy barrier and change over to products thereby increasing the rate of the reaction.
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 Answer :b

Discussion

29.	Assertion : A catalyst is a substance which alters the rate of a reaction. Reason : In the presence of catalyst the energy of activation is increased.
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 :C

Discussion

30.	Assertion (A) : Catalyst increases the rate of reaction. Reason (R ) : Catalyst lowers the threshold energy of the 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 :A

Discussion

31.	Assertion. A catalyst increases the rate of a reaction. Reason. In presence of a catalyst, the activation energy of the reaction decreases.
Answer» If both assertion and REASON are TRUE and reason is the true explanation of the assertion. If both assertion and reason ae 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 A. A catalyst MAY INCREASES or decrease the rate of a reaction. Correct R. A negative catalyst does not decrease the activation energy of a reaction.

Discussion

32.	Assertion : A catalyst can initiate a reaction. Reason : The principle behind catalysis is absorption.
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 :D

Discussion

33.	Assertion (A) : Carbylamine reaction involves the chemical reaction between 1^(@) amine and chloroform in basic medium. Reason (R) : In carbylamine reaction, -NH_(2) group changes to -NC 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 :A

Discussion

34.	Assertion (A) , Carboxylic acids having an a-hydrogen are halogenated at a-position on treatment with Cl_(2) or Br_(2) in the presence of red phosphorus. Reason (R) : Aromatic carboxylic acids do not react with 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

35.	Assertion (A) : Carboxylic acids show acidic properties. Reason (R) : The carboxylate ion after the removal of proton from carboxylic acids gets stabilised by resonance.
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

36.	Assertion (A) : Calamine and Dolomite are the Carbonate ores. Reason (R ) : Calamine is ZnCO_(3) whereas dolomite is MgCO_(3).ZnCO_(3)
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 :C

Discussion

37.	Assertion (A) : C_(2)H_(5)OHis a weaker base than phenol but is a stronger nucleophile than phenol . Reason (R ) : In phenol the lone pair of electrons on oxygen is withdrawn towards the ring due to resonance .
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

38.	Assertion (A) : Burning of sulphur or sulphide ore generates SO_2. Reason (R) : Rhombic sulphur is insoluble in water but dissolves readily in CS_2.
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 :B

Discussion

39.	Assertion (A): Both boron and silicon form covalent hydrides. Reason(R):Boron does not shows diagonal relationship with silicon of group 14.
Answer» A and R are CORRECT and R EXPLAINS A. A and R are correct and R not explains A. A is correct R is WRONG. A is wrong but R is correct Answer :C

Discussion

40.	Assertion (A) : Both H_(2)S_(2)O_(2) and H_(2)S_(2)O_(3) contains S = S bonds Reason (R): '-ic' acid are more Acidic than 'ous'acid The correct answer is
Answer» Both A and R are TRUE and R is the CORRECT explanation of A BothA and R are true and R is not the correct explanation of A A is true but R is FALSE A is false but R is true Answer :B

Discussion

41.	Assertion (A) : Brass contains 60% zinc and 40% copper. Reason (S) : Formula for haematite is Fe_(2)O_(3).
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 :D

Discussion

42.	Assertion A: Boron combines with halogen to form trihalides at high temperatures. Reason (R):Boron does not reacts directly with hydrogen.
Answer» ANSWER :B

Discussion

43.	Assertion (A): Bond angle in ethers is slightly less than the tetrahedral angle. Reason (R) : There is a repulsion between the two bulky (-R) groups.
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 is wrong statement and reason is correct statement. Solution :`to` Because of REPULSION between two bulky groups in ether, the bond ANGLE is greater than tetrahedral angle.

Discussion

44.	Assertion (A): Boiling points of alkyl halides decreases in the order : RI gt RBr gt BCl gt RFReason (R) : Attractions get stronger as the molecules get bigger in size.
Answer» Both ASSERTION (A) and Resort (R) are CORRECT statements, quid Reason (R) is the correct EXPLANATION of the Assertion (A). Both Assertion (A) and Reason (R) are correct statements, brit 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 RENSON (R) is correct statement. Answer :a

Discussion

45.	Assertion (A) : Boiling points of alcohols and ethers are high. Reason (R) : They can form intermolecular H-bonding.
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 is wrong statement and reason is correct statement. Solution :Ethers have low boiling points because they do not FORM INTERMOLECULAR H-bonding,

Discussion

46.	Assertion (A) : Boiling points of alkyl halides decrease in the order R-I gt R - Br gt R - Cl gt R-F Reason (R ) : van der Waals forces decrease with increase in the size of halogen atom.
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): Bleacing powder is also known as calcium chloro hypo chlorite Reason R: Bleaching powder is mixed salt of calcium chloride and per chlorite
Answer» A & are true, R is correct explanation of A A & R are true, R is not correct explanation of A A is true, but R is false A is false, but R is true Solution :BLEACHING Powder is a MIXTURE of CALCIUM chloride and calcium HYPO chlorite

Discussion

48.	Assertion (A): BF_(3) reacts with ammonia to form complex. Reason (R):BF_(3) is a electron deficient compound and accepts electrons pairs to form coordinate covalent bonds.
Answer» ANSWER :A

Discussion

49.	Assertion (A) : beta-naphthol and benzene diazonium chloride react at low temperature to produce an azo dye. Reason (R) : The reaction with beta-Naphthol and Benzene diazonium chloride is called coupling reaction.
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

50.	Assertion (A) : beta-Black phosphorus is formed when red phosphorus is heated in a sealed tube at 803 K. Reason (R) : Phosphine is a colourless gas with rotten fish smell and is highly poisonous.
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

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion (A) : [Co(NH_(3))_(5)(SO_(4))]Br and [Co(NH_(3))_(5)Br]SO_(4) are examples of ionisation isomerism. Reason (R) : Hydrate isomers have water molecules only as water of crystallisation.

Assertion (A): Conductivity of an electrolyte increases with decrease in concentration. Reason (R ): Number of ions per unit volume decreases on dilution.

Assertion (A) : Conductivity of an electrolyte depends upon the size of the ions produced andtheir solvation. Reason (R) : Conductivity of an electrolyte does not depend upon temperature.

Assertion :A concetrated solutionof BiCI_(3) can be easilly diluted to any extenty withwater Reasion : BiCI_(3) does notcahngein compositionwith dilution

Assertion (A) : Conductivity of an electrolyte decreases with decrease in concentration. Reason ( R ) : Number of ions per unit volume increases on dilution.

Assertion (A): Condensation polymerisation progresses step by step and is also called step growth polymerisation.Reason (R) : Polypropene is used in the manufacture of ropes, toys, pipes and fibres.

Assertion (A) : Conc. H_2SO_4 cannot be used to prepare HI from KI. Reason (R) :Conc. H_2SO_4 is a strong oxidising agent.

Assertion (A): Compounds with two hydroxy groups are gem diols. Reason (R): Ethanol which contains 5% methanol is known s methylated spirit.

Assertion (A) : Complexes of central metal atom such as of Cu^(+), Zn^(2+), SC^(3+), Ti^(4+) are colourless. Reason (R ) : Cu^(+), Zn^(2+), SC^(3+), Ti^(4+) are having d^(0) or d^(10) configuration and because of it, d-d transition is not possible and so they are colourless.

Assertion (A): Competitive inhibitors compete with natural substrate for their attachment on the active sites of enzymes. Reason (R): In competitive inhibition, inhibitor binds to the allosteric site of the enzyme.

Assertion (A) Competitive inhibitors compete with natural substrate for their attachement on the active sites of enzymes. Reason (R) In competitive inhibitor binds to the allosteric site of the enzyme.

Assertion (A) : Common name of CH_(3) - CHCl_(2) is ethylidene chloride. Reason (R) As we go down the group in the Periodic Table, the size of halogen atom decreases.

Assertion (A) : Combustion of 16 g of methane gives 18 g of water. Reason (R) : In the combusition of methane, water is one of the products.

Assertion (A) : Colloidal solutions show colligative properties. Reason (R) : Colloidal particles are large in size.

Assertion (A) : Colloidal solutions do not show Brownian motion. Reason (R) : Brownion motion is responsible for stability of sols.

Assertion (A) : Coagulation power of Al^(3+) is more than Na^(+). Reason (R) : Greater the valency of the flocculating ion added, greater is its power to cause precipitation. (Hardy-Schulze Rule)

Assertion: A cis-isomer has a net dipole moment zero. Reason: cis- isomers has two ligands of the different type occupying adjacent positions.

Assertion (A) : Chemisorption is highly specific and occurs only when there is a possibility of chemical bond formation. Reason (R) : Freundlich adsorption isotherm is given by the equation x/m = kp^(1//n) ( n gt 1)

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

Assertion (A) Chemical messengers are chemicals that enable communications of message between tow neurons or between or between neurons and muscles. Reason (R) Chemicals enter the cell through receptor.

Assertion (A) : Chemical messenger gives message to the cell without entering the cell. Reason (R) : Chemical messenger is received at the binding site of receptor proteins.

Assertion (A) : Chemical adsorption is an exothermic process. Reason (R) : In chemical adsorption, gas molecules are held to the surface by formation of chemical bonds. Since strong bond is formed, nearly 400kJ/mole is given out as heat adsorption.

Assertion (A) : (CH_(3))_(3)N boils at 276 K while CH_(3)CH_(2)CH_(2)NH_(2) at 322 K through both have same molecular mass. Reason (R) : Molecules of CH_(3)CH_(2)CH_(2)NH_(2) form hydrogen bonds while (CH_(3))_(3)N molecules are incapable of forming hydrogen bonds.

Assertion (A) :(CH_3)_3 C-O - CH_3 gives (CH_3)_3 C-I and CH_3 OH on treatment with HI. Reason (R ) : The reaction occurs by S_(N)1mechanism.

Assertion (A): (CH_(3))_(2)-underset(CH_(3))underset(|)C-OH + HCl overset("anhy")underset(ZnCl_(2)) to No reaction at Room temperature Reason(R): (CH_(3))_(2)-underset(CH_(3))underset(|)C-OH + HCl is a secondary alcohol.

Assertion (A) : Catalyst presence increase the rate the reaction Reason (R) : in the presence of a catalyst , energy of activation is lowered and hence greater number of molecules can across the energy barrier and change over to products thereby increasing the rate of the reaction.

Assertion : A catalyst is a substance which alters the rate of a reaction. Reason : In the presence of catalyst the energy of activation is increased.

Assertion (A) : Catalyst increases the rate of reaction. Reason (R ) : Catalyst lowers the threshold energy of the reaction.

Assertion. A catalyst increases the rate of a reaction. Reason. In presence of a catalyst, the activation energy of the reaction decreases.

Assertion : A catalyst can initiate a reaction. Reason : The principle behind catalysis is absorption.

Assertion (A) : Carbylamine reaction involves the chemical reaction between 1^(@) amine and chloroform in basic medium. Reason (R) : In carbylamine reaction, -NH_(2) group changes to -NC group.

Assertion (A) , Carboxylic acids having an a-hydrogen are halogenated at a-position on treatment with Cl_(2) or Br_(2) in the presence of red phosphorus. Reason (R) : Aromatic carboxylic acids do not react with ammonia.

Assertion (A) : Carboxylic acids show acidic properties. Reason (R) : The carboxylate ion after the removal of proton from carboxylic acids gets stabilised by resonance.

Assertion (A) : Calamine and Dolomite are the Carbonate ores. Reason (R ) : Calamine is ZnCO_(3) whereas dolomite is MgCO_(3).ZnCO_(3)

Assertion (A) : C_(2)H_(5)OHis a weaker base than phenol but is a stronger nucleophile than phenol . Reason (R ) : In phenol the lone pair of electrons on oxygen is withdrawn towards the ring due to resonance .

Assertion (A) : Burning of sulphur or sulphide ore generates SO_2. Reason (R) : Rhombic sulphur is insoluble in water but dissolves readily in CS_2.

Assertion (A): Both boron and silicon form covalent hydrides. Reason(R):Boron does not shows diagonal relationship with silicon of group 14.

Assertion (A) : Both H_(2)S_(2)O_(2) and H_(2)S_(2)O_(3) contains S = S bonds Reason (R): '-ic' acid are more Acidic than 'ous'acid The correct answer is

Assertion (A) : Brass contains 60% zinc and 40% copper. Reason (S) : Formula for haematite is Fe_(2)O_(3).

Assertion A: Boron combines with halogen to form trihalides at high temperatures. Reason (R):Boron does not reacts directly with hydrogen.

Assertion (A): Bond angle in ethers is slightly less than the tetrahedral angle. Reason (R) : There is a repulsion between the two bulky (-R) groups.

Assertion (A): Boiling points of alkyl halides decreases in the order : RI gt RBr gt BCl gt RFReason (R) : Attractions get stronger as the molecules get bigger in size.

Assertion (A) : Boiling points of alcohols and ethers are high. Reason (R) : They can form intermolecular H-bonding.

Assertion (A) : Boiling points of alkyl halides decrease in the order R-I gt R - Br gt R - Cl gt R-F Reason (R ) : van der Waals forces decrease with increase in the size of halogen atom.

Assertion (A): Bleacing powder is also known as calcium chloro hypo chlorite Reason R: Bleaching powder is mixed salt of calcium chloride and per chlorite

Assertion (A): BF_(3) reacts with ammonia to form complex. Reason (R):BF_(3) is a electron deficient compound and accepts electrons pairs to form coordinate covalent bonds.

Assertion (A) : beta-naphthol and benzene diazonium chloride react at low temperature to produce an azo dye. Reason (R) : The reaction with beta-Naphthol and Benzene diazonium chloride is called coupling reaction.

Assertion (A) : beta-Black phosphorus is formed when red phosphorus is heated in a sealed tube at 803 K. Reason (R) : Phosphine is a colourless gas with rotten fish smell and is highly poisonous.