94420 + Interview Questions in Chemistry in Class 12

1.	Assertion(A): Penicillin (G) is an antihistamine. Reason (R): Penicillin G is effective against gram positive as well as gram negative bacteria.
Answer» Both A and R are CORRECT and R EXPLAINS 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 :D

Discussion

2.	Assertion(A): P-nitro phenol is having lower pK_a value than phenol. Reason (R): The electron with drawing group -NO_2 at para position enhances the acidic nature.
Answer» Both A and R are correct and R is the CORREET EXPLANATION of A. Both A and R are WRONG A is wrong but R is correct A is correct but R is wrong Solution :Both A and R are correct and R is the correet explanation of A.

Discussion

3.	Assertion(A): P-nitro phenol is a stronger acid than o-nitro phenol. Reason (R): Intra molecular hydrogen bonding in o-nitro phenol make it as a weaker acid.
Answer» Both A and R CORRECT and R is the correct EXPLANATION of A. Both A are WRONG A is correct but R is wrong A is wrong but R is correct SOLUTION :Both A and R correct and R is the correct explanation of A.

Discussion

4.	Assertion(A): Opioids produces coma and even death. Reason (R): Opioids releive pain and produce sleep and drugs are addictive and also poisonous in nature.
Answer» Both A and R are CORRECT and R EXPLAINS 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

5.	Assertion(A): P-cresol is less acidic than phenol. Reason (R): Alkyl substituted phenols show a decreased acidity due to the electron releasing +I effect of alkyl group.
Answer» Both A and R are CORRECT and R is not the correct EXPLANATION of A. Both A and R are correct and R is the correct explanation of A. Both A and R are WRONG A is correct but R is wrong SOLUTION :Both A and R are correct and R is the correct explanation of A.

Discussion

6.	Assertion(A) - OF molecule is theoretically more stable than F_2 Reason(R) : Bond order in OF molecule is higher than in F_2 molecule
Answer» Both A and R TRUE and R is the CORRECT EXPLANATION of A Both A and R true and R is not acorrect explanation of A A is true but R is FALSE A is false but R is true Answer :A

Discussion

7.	Assertion(A): O-nitro phenol is slightly soluble in water whereas P-nitro phenol is more soluble in water. Reason (R): O-nitro phenol has intra molecular hydrogen bonding whereas P-nitro phenol has inter molecular hydrogen bonding.
Answer» Both A and R are CORRECT and R is the correet explanation of A. Both A and are WRONG 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 correet explanation of A.

Discussion

8.	Assertion(A): Nitrobenzne undergoes friedel craft reaction. Reason(R):Nitrobenzene have strong deactivating NO_(2) group.
Answer» Both A and R are CORRECT and r is explains A Both A and R but R is WRONG A is correct but R is wrong A is wrong but R is correct Answer :C

Discussion

9.	Assertion(A): Nitrobenzene cannot be prepared from bromo benzene by action of ethanolic solutioin of potassium nitrite. Reason(R):The bromine directly attached to thebenzene ring cannot be cleaved easily.
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

10.	Assertion(A) Nitro alkanes dissolve in NaOH solution of form a salt. Reason (R):The alpha - H atom of 1^(@) and 2^(@) nitroalkanes show acidic character because of the electron withdrawing effect of NO_(2) group.
Answer» Both A and R are correct and r is EXPLAINS A Both A and R but R is WRONG A is correct but R is wrong A is wrong but R is correct Answer :A

Discussion

11.	Assertion(A): Natural rubber becomes strong and elastic when heated with sulphur. Reason (R): Natural rubber is mixed with 3-5% sulphur and heated at 100-150°C causes cross linking of the cis-1,4 - polyisoprene chains through disulphide - S - s bonds.
Answer» Both A and R are CORRECT and R EXPLAINS 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

12.	Assertion(A): Monosaccharides are held by glycocidic bonds. Reason (R): Monosaccharides are macro molecules
Answer» Both A and R are CORRECT and R EXPLAINS A. Both A and R are correct but R does not explains A. A is WRONG but R is correct. Both A and R are wrong. Answer :D

Discussion

13.	Assertion(A): Maltose, a disaccharide acts as a reducing sugar. Reason (R): Maltose consists of two molecules of alpha - Dglucosewith linked by alpha 1,4 - glycosidic bond and one glucosehas the carbonyl group.
Answer» Both A and R are CORRECTAND R is the correctexplanationof A Both A and RARE CORRECT butR isnotthe correctexplanationof A . A is correct but R is WRONG. A is wrong but R iscorrect Answer :A

Discussion

14.	Assertion(A): Milk of magnesia and aluminium hydroxide are usually used as antacids, Reason (R): Mg(OH)_(2), and Al(OH)_(3) , are weak bases and they neutralise the acid in the stomach that causes acidity.
Answer» Both A and R are CORRECT and R EXPLAINS 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

15.	Assertion(A) Mercuty cell does not give steady potential Reason (R) In the cell reaction, ions are not involved in solution.
Answer» Both assertion and reason are true and the 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 the reason is false. Both assertion and reason are false. Solution :Assertion is false but reason is true, correct assertion ismercury CELL GIVES STEADY potential Reason is correct as IONS are not involved in cell reaction

Discussion

16.	Assertion(A) - Magnetic moment of super oxide ion is much larger than that of peroxide ion. Reason( R )-Peroxide ion has no unpaired electrons but superoxide ion has unpaired electrons.
Answer» Both A and R TRUE and R is the CORRECT EXPLANATION of A Both A and R true and R is not acorrect explanation of A A is true but R is FALSE A is false but R is true Answer :A

Discussion

17.	Assertion(A): Lower aliphatic carboxylic acids are miscible with water but higher carboxylic acids are insoluble in water. Reason (R): Lower carboxylic acids are able to form hydrogen bond with water whereas higher carboxylic acids have increased hydrophobic interaction of hydrocarbon part.
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 A is correct but R is wrong A is wrong but R is correct ANSWER :A

Discussion

18.	Assertion(A): LiAlH_4 is the best reagent to prepare unsaturated alcohols from carbonyl compounds. Reason (R): LiAlH_4does not reduce the carbon- carbon double bond present in the carbony! carbon compound.
Answer» Both A and R are CORRECT and R is the correet 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 correet explanation of A.

Discussion

19.	Assertion(A): Lactose is referred to as milk sugar. Reason (R) : Itis extracted from sprouted barley.
Answer» Both A and R are CORRECT and R is the correct EXPLANATION of A. Both A and R are worng. A is correct but R is WRONG. A is wrong but R is correct. Answer :A

Discussion

20.	Assertion(A) - KCl is a heteroatomic as well as diatomic molecule Reason(R ) : Aqueous solution of KCl conducts electricity and at the same time it undergoes decomposition.
Answer» Both A and R TRUE and R is the CORRECT EXPLANATION of A Both A and R true and R is not acorrect explanation of A A is true but R is FALSE A is false but R is true Answer :D

Discussion

21.	Assertion(A): Inter molecular dehydration of alcohol is not a suitable method of preparemixed ethers. Reason (R): When a mixture of two different alcohols are used, mixture of different ethers are formed and they are difficult to separate.
Answer» Both A and R are CORRECT and R is the CORREET explanation of A. Both A and R are correct but R is not the correct explanation of A Ais correct but R is wrong A is wrong but R is correct Solution :Both A and R are correct and R is the correet explanation of A.

Discussion

22.	Assertion(A): In the fermentation process of molasses, along with yeast (NH_(4))_(2)SO_(4), (NH_(4))_(3) PO_(4) is added Reason (R): (NH_(4))_(3)PO_(4) and (NH_(4))_(2)SO_(4), act as food and helps the growth of yeast.
Answer» Both A and R are TRUE and R is the CORRECT EXPLANATION to A Both A and R are true and R is not the correct explanation to A A is true but R is FALSE A is false but R is true Answer :A

Discussion

23.	Assertion(A): In Rosenmund's reduction, BaSO_4act as catalyst poison. Reason (R): In Rosenmund's reduction, BaSO_4act as catalytic poison to pd catalyst so that aldehyde cannot be further reduced it alcohol.
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 A is correct but R is wrong A is wrong but R is correct Answer :A

Discussion

24.	Assertion(A): In proteins, amino acids are linked through peptide bonds.Reason (R): Peptide bonds are glycosidic (or) oxygen bridges.
Answer» Both A and R are CORRECT and R EXPLAINS A. Both A and R are correct but R does not explains A. A is correct but R is WRONG. Ais wrong but R is correct. Answer :C

Discussion

25.	Assertion(A): Higher the TFM quantity in the soap, better is its quality. Reason (R): The quality of the soap is described in terms of total fatty matter (TFM value). Grade I soap should have 76% minimum TFM value.
Answer» Both A and R are CORRECT and R EXPLAINS 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): In all living systems, the biochemical reactions are catalysed by enzymes. This principle is applied to kill many pathogens. Reason (R): The enzyme actions are highly essential for normal functioning of the system.
Answer» Both A and R are CORRECT and R EXPLAINS 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

27.	Assertion(A): Higher the value of therapeutic index, safer the drug. Reason (R): Therapeutic index is defined as the ratio between the maximum tolerated dose of a drug and the minimum curative dose.
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 EXPLAINS A. A is correct but R is WRONG. A is wrong but R is correct. Answer :A

Discussion

28.	Assertion(A) - H_2 molecule is stabler than HCH molecule. Reason(R ) :The antibonding electron in the molecules stabilises it.
Answer» Both A and R TRUE and R is the CORRECT EXPLANATION of A Both A and R true and R is not acorrect explanation of A A is true but R is FALSE A is false but R is true Answer :A

Discussion

29.	Assertion(A): Glycol is more viscous than ethanol. Reason (R): Glycol contains two hydroxyl groups and the inter molecular hydrogen bonding is made much stronger resulting in a polymeric structure. This leads to high viscosity than ethanol.
Answer» Both A and R are correct and R is the CORREET EXPLANATION of A. Both A and are correct but R is not the correct explanation of A. Both A and R are wrong A is correct but R is wrong SOLUTION :Both A and R are correct and R is the correet explanation of A.

Discussion

30.	Assertion(A): Fruit formation process shows increase in the rate with passage of time. Reason(R): Hydrolysis os these ester is homogeneous autocatalytic reaction.
Answer» If both (A) and (R) are CORRECT, and (R) is the correct EXPLANATION of (A) If both (A) and (R) are correct, but (R) is the correct explanation of (A). If (A) is correct, but (R) is INCORRECT. If (A) is incorrect, but (R) is correct. S Solution :N//A

Discussion

31.	Assertion(A) For measuring resistance of an ionic solution an AC sourceis used. Reason (R) Concentration of ionic solution will will chagne if DC source is used.
Answer» Both assertion and reason are true and the 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 the reason is FALSE. Both assertion and reason are false. Solution :Both assertion and reason are correct and reason is the correct explanation of assertion. Concentration of IONIC solution changes on using DC current as a source of energy while on passing AC current concentration does not CHANGE Hence AC source is used for MEASURING resistances.

Discussion

32.	Assertion(A): Formic acid can act as a strong reducing agent Reason (R): Formic acid contains both aldehyde as well as an acid group.
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 A is correct but R is WRONG A is wrong but R is correct Answer :D

Discussion

33.	Assertion(A) - FeCl_3 undergoes sublimation at a lower temperature. Reason( R )-Fe^(3+) has low polarising power and hence FeCl_3 has high covalent character.
Answer» Both A and R TRUE and R is the correct EXPLANATION of A Both A and R true and R is not acorrect explanation of A A is true but R is FALSE A is false but R is true Answer :C

Discussion

34.	Assertion(A): Ethanol is a weaker acid than Phenol. Reason (R): Sodium ethoxide may be prepared by the reaction of ethanol with sodium metal but phenol reacts with NaOH.
Answer» Both A and R are correct and R is the CORREET 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 correet explanation of A.

Discussion

35.	Assertion(A) Ethanol is a weaker acid than phenol Reason (R) : Sodium ethoxide many be prepared by reaction of ethanol with aqueous KOH
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 :PHENOL is STRONGER acid than ethanol because the phenoxide ion is resonance stabilized. The sodium ETHOXIDE is prepared by reaction of sodium metal with ethanol.

Discussion

36.	Assertion(A): Electrophilic substituon in aniline take place at ortho and para position. Reason(R):The NH_(2) gropu is a strong activating group and lone pair of electrons on the nitrogen atom is in conjugatioin with benzene ring that increases electro density at ortho and para position.
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

37.	Assertion(A): Enzymes have active sites that hold substrate molecule for a chemical reaction. Reason (R): Drugs compete with natural substate by attaching covalently to the active site of enzyme.
Answer» Both A and R are CORRECT and R explains 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 :C

Discussion

38.	Assertion(A) Electrolysis of NaCl solution gives chlorine at anode instead of O_(2). Reason(R) Formation of oxygen at anode requires over voltage.
Answer» Both ASSERTION and reason are true and the 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 the reason is false. Both assertion and reason are false. Solution :Both assertion and reason are correct and reason is the correct explanation of assertion Explanation ELECTROLYSIS of NaCl is represented by following chemcial reactions At cathode `H^(+)(aq)+e^(-) rarr(1)/(2)H_(2)(g)` At anode `Cl^(-)(Aq)rarr(1)/(2)Cl_(2)+e^(-),E_("cell")^(@)=1.36V` `2H_(2)O(aq)rarrO_(2)(g)+4H^(+)(aq)+4e^(-):E_("cell")^(@)=1.23V` `E_("cell")^(@)` for this REACTION has lower value but FORMATION of oxygen at anode requires over potential.

Discussion

39.	Assertion(A) E_(Ag^(+)//Ag^(@) increase with increase in concentration of Ag^(+) ions. Reason(R) E_(Ag^(+)//Ag) has a positive value.
Answer» Both assertion and reason are true and the 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 the reason is FALSE. Both assertion and reason are false. Solution :Both assertion and reason are correct but reason is not the correct explanation of `E=E-(0.0591)/(1)"LOG"(1)/([AG^(+)])` ltbr. `E=E^(@)+0.059"log"[Ag^(+)]` ltbr. THUS, `E_(Ag^(+)//Ag)` increases in concentration of `Ag^(+)`

Discussion

40.	Assertion(A): During soap preparation, common salt is added to the reaction mixture. Reason (R): Common salt decreases the solubility of soap and it helps to precipitate out from the aqueous solution.
Answer» Both A and R are CORRECT and R EXPLAINS 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

41.	Assertion(A) : Decrease of free energy during the process under particular conditions provides a measure of its spontaneity. Reason(R ) : A spontaneous change must have +ve sign of DeltaS_("total").
Answer» Both `A`and `R` are TRUE and `R` is the correct EXPLANTION of `A` Both `A`and `R` are true and `R` is not acorrect explantion of `A` `A` is true but `R` is FALSE `A` is false but `R` is true Answer :B

Discussion

42.	Assertion(A) Current stops flowing when E_("cell")=0 . Reason(R) Equilibrium of the cell reaction is attained.
Answer» Both assertion and reason are true and the 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 the reason is false. Both assertion and reason are false. Solution :Both assertion and reason are correct and reason is the correct explnanation of assertion. Current stop flowing when `E_("cell")=0` As at `E_("cell")=0` reaction REACHES the equilibrium.

Discussion

43.	Assertion(A) - CO_3^(2-)ion is relatively more stable than H_2CO_3. Reason( R )-The negative charge of carbonate ion is delocalised on all the three oxygen atoms.
Answer» Both A and R TRUE and R is the CORRECT EXPLANATION of A Both A and R true and R is not acorrect explanation of A A is true but R is FALSE A is false but R is true Answer :D

Discussion

44.	Assertion(A): Carboxylic acid do not give the characteristic reaction of carbonyl group as given by aldehyde and ketone. Reason (R): The carbonyl carbon of carboxylic acid is involved in resonance
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 A is correct but R is wrong A is wrong but R is correct ANSWER :C

Discussion

45.	Assertion(A): (CH_3)_3C - O - CH_3on reaction with HI gives CH_3OH and (CH_3)_3C - I as the main products and not (CH_3)_3C-OH and CH_3I. Reason (R):(CH_3)_3C + Tertiary carbo cation) is more stable and reacts with HI to form (CH_3)_3C - I as main product.
Answer» Both A and R are CORRECT and R is the CORREET explanation of A. Both A and R are WRONG 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 correet explanation of A.

Discussion

46.	Assertion(A): Carboxylic acids have higher boiling point than aldehyde and ketone of comparable molecular mass. Reason (R): This is due to more association of carboxylic acid. Molecules through intermolecular hydrogen bonding.
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 A is correct but R is wrong A is wrong but R is correct ANSWER :B

Discussion

47.	Assertion(A): Carbon dioxide is non flammable gas. Reason(R):CO_(2) critical temperature is 31^(@)C and can be readily liquefied.
Answer» (a) A and R are CORRECT and R EXPLAINS A. (b) A and R are correct and R not explains A. (c) A is correct but R is WRONG. (d) A is wrong but R is correct. Answer :B

Discussion

48.	Assertion(A): CaCl_(2) can't be used for drying ethyl alcohol Reason (R): Hydrogen bond is formed between water and alcohol molecules.
Answer» Both A and R are true and R is the CORRECT explanation to A Both A and R are true and R is not the correct explanation to A A is true but R is false A is false but R is true Answer :A

Discussion

49.	Assertion(A): Bond angle in ethers is slightly less than the tetra hedral angle. Reason (R): There is a repulsion between the two bulkier R groups.
Answer» Both A and R are correct but R is not the correct EXPLANATION of A. Both A and are WRONG Both A and R are correct and R is the correct explanation of A A is correct but R is wrong SOLUTION :Both A and R are correct and R is the correct explanation of A

Discussion

50.	Assertion(A): Both alcohol and ether have higher boiling point. Reason (R): Both are having intermolecular hydrogen bonding.
Answer» Both A and R are CORRECT and R is the CORREET EXPLANATION of A. Both A and R are wrong A is correct but R is wrong A is wrong but R is correct SOLUTION :Both A and R are wrong

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion(A): Penicillin (G) is an antihistamine. Reason (R): Penicillin G is effective against gram positive as well as gram negative bacteria.

Assertion(A): P-nitro phenol is having lower pK_a value than phenol. Reason (R): The electron with drawing group -NO_2 at para position enhances the acidic nature.

Assertion(A): P-nitro phenol is a stronger acid than o-nitro phenol. Reason (R): Intra molecular hydrogen bonding in o-nitro phenol make it as a weaker acid.

Assertion(A): Opioids produces coma and even death. Reason (R): Opioids releive pain and produce sleep and drugs are addictive and also poisonous in nature.

Assertion(A): P-cresol is less acidic than phenol. Reason (R): Alkyl substituted phenols show a decreased acidity due to the electron releasing +I effect of alkyl group.

Assertion(A) - OF molecule is theoretically more stable than F_2 Reason(R) : Bond order in OF molecule is higher than in F_2 molecule

Assertion(A): O-nitro phenol is slightly soluble in water whereas P-nitro phenol is more soluble in water. Reason (R): O-nitro phenol has intra molecular hydrogen bonding whereas P-nitro phenol has inter molecular hydrogen bonding.

Assertion(A): Nitrobenzne undergoes friedel craft reaction. Reason(R):Nitrobenzene have strong deactivating NO_(2) group.

Assertion(A): Nitrobenzene cannot be prepared from bromo benzene by action of ethanolic solutioin of potassium nitrite. Reason(R):The bromine directly attached to thebenzene ring cannot be cleaved easily.

Assertion(A) Nitro alkanes dissolve in NaOH solution of form a salt. Reason (R):The alpha - H atom of 1^(@) and 2^(@) nitroalkanes show acidic character because of the electron withdrawing effect of NO_(2) group.

Assertion(A): Natural rubber becomes strong and elastic when heated with sulphur. Reason (R): Natural rubber is mixed with 3-5% sulphur and heated at 100-150°C causes cross linking of the cis-1,4 - polyisoprene chains through disulphide - S - s bonds.

Assertion(A): Monosaccharides are held by glycocidic bonds. Reason (R): Monosaccharides are macro molecules

Assertion(A): Maltose, a disaccharide acts as a reducing sugar. Reason (R): Maltose consists of two molecules of alpha - Dglucosewith linked by alpha 1,4 - glycosidic bond and one glucosehas the carbonyl group.

Assertion(A): Milk of magnesia and aluminium hydroxide are usually used as antacids, Reason (R): Mg(OH)_(2), and Al(OH)_(3) , are weak bases and they neutralise the acid in the stomach that causes acidity.

Assertion(A) Mercuty cell does not give steady potential Reason (R) In the cell reaction, ions are not involved in solution.

Assertion(A) - Magnetic moment of super oxide ion is much larger than that of peroxide ion. Reason( R )-Peroxide ion has no unpaired electrons but superoxide ion has unpaired electrons.

Assertion(A): Lower aliphatic carboxylic acids are miscible with water but higher carboxylic acids are insoluble in water. Reason (R): Lower carboxylic acids are able to form hydrogen bond with water whereas higher carboxylic acids have increased hydrophobic interaction of hydrocarbon part.

Assertion(A): LiAlH_4 is the best reagent to prepare unsaturated alcohols from carbonyl compounds. Reason (R): LiAlH_4does not reduce the carbon- carbon double bond present in the carbony! carbon compound.

Assertion(A): Lactose is referred to as milk sugar. Reason (R) : Itis extracted from sprouted barley.

Assertion(A) - KCl is a heteroatomic as well as diatomic molecule Reason(R ) : Aqueous solution of KCl conducts electricity and at the same time it undergoes decomposition.

Assertion(A): Inter molecular dehydration of alcohol is not a suitable method of preparemixed ethers. Reason (R): When a mixture of two different alcohols are used, mixture of different ethers are formed and they are difficult to separate.

Assertion(A): In the fermentation process of molasses, along with yeast (NH_(4))_(2)SO_(4), (NH_(4))_(3) PO_(4) is added Reason (R): (NH_(4))_(3)PO_(4) and (NH_(4))_(2)SO_(4), act as food and helps the growth of yeast.

Assertion(A): In Rosenmund's reduction, BaSO_4act as catalyst poison. Reason (R): In Rosenmund's reduction, BaSO_4act as catalytic poison to pd catalyst so that aldehyde cannot be further reduced it alcohol.

Assertion(A): In proteins, amino acids are linked through peptide bonds.Reason (R): Peptide bonds are glycosidic (or) oxygen bridges.

Assertion(A): Higher the TFM quantity in the soap, better is its quality. Reason (R): The quality of the soap is described in terms of total fatty matter (TFM value). Grade I soap should have 76% minimum TFM value.

Assertion(A): In all living systems, the biochemical reactions are catalysed by enzymes. This principle is applied to kill many pathogens. Reason (R): The enzyme actions are highly essential for normal functioning of the system.

Assertion(A): Higher the value of therapeutic index, safer the drug. Reason (R): Therapeutic index is defined as the ratio between the maximum tolerated dose of a drug and the minimum curative dose.

Assertion(A) - H_2 molecule is stabler than HCH molecule. Reason(R ) :The antibonding electron in the molecules stabilises it.

Assertion(A): Glycol is more viscous than ethanol. Reason (R): Glycol contains two hydroxyl groups and the inter molecular hydrogen bonding is made much stronger resulting in a polymeric structure. This leads to high viscosity than ethanol.

Assertion(A): Fruit formation process shows increase in the rate with passage of time. Reason(R): Hydrolysis os these ester is homogeneous autocatalytic reaction.

Assertion(A) For measuring resistance of an ionic solution an AC sourceis used. Reason (R) Concentration of ionic solution will will chagne if DC source is used.

Assertion(A): Formic acid can act as a strong reducing agent Reason (R): Formic acid contains both aldehyde as well as an acid group.

Assertion(A) - FeCl_3 undergoes sublimation at a lower temperature. Reason( R )-Fe^(3+) has low polarising power and hence FeCl_3 has high covalent character.

Assertion(A): Ethanol is a weaker acid than Phenol. Reason (R): Sodium ethoxide may be prepared by the reaction of ethanol with sodium metal but phenol reacts with NaOH.

Assertion(A) Ethanol is a weaker acid than phenol Reason (R) : Sodium ethoxide many be prepared by reaction of ethanol with aqueous KOH

Assertion(A): Electrophilic substituon in aniline take place at ortho and para position. Reason(R):The NH_(2) gropu is a strong activating group and lone pair of electrons on the nitrogen atom is in conjugatioin with benzene ring that increases electro density at ortho and para position.

Assertion(A): Enzymes have active sites that hold substrate molecule for a chemical reaction. Reason (R): Drugs compete with natural substate by attaching covalently to the active site of enzyme.

Assertion(A) Electrolysis of NaCl solution gives chlorine at anode instead of O_(2). Reason(R) Formation of oxygen at anode requires over voltage.

Assertion(A) E_(Ag^(+)//Ag^(@) increase with increase in concentration of Ag^(+) ions. Reason(R) E_(Ag^(+)//Ag) has a positive value.

Assertion(A): During soap preparation, common salt is added to the reaction mixture. Reason (R): Common salt decreases the solubility of soap and it helps to precipitate out from the aqueous solution.

Assertion(A) : Decrease of free energy during the process under particular conditions provides a measure of its spontaneity. Reason(R ) : A spontaneous change must have +ve sign of DeltaS_("total").

Assertion(A) Current stops flowing when E_("cell")=0 . Reason(R) Equilibrium of the cell reaction is attained.

Assertion(A) - CO_3^(2-)ion is relatively more stable than H_2CO_3. Reason( R )-The negative charge of carbonate ion is delocalised on all the three oxygen atoms.

Assertion(A): Carboxylic acid do not give the characteristic reaction of carbonyl group as given by aldehyde and ketone. Reason (R): The carbonyl carbon of carboxylic acid is involved in resonance

Assertion(A): (CH_3)_3C - O - CH_3on reaction with HI gives CH_3OH and (CH_3)_3C - I as the main products and not (CH_3)_3C-OH and CH_3I. Reason (R):(CH_3)_3C + Tertiary carbo cation) is more stable and reacts with HI to form (CH_3)_3C - I as main product.

Assertion(A): Carboxylic acids have higher boiling point than aldehyde and ketone of comparable molecular mass. Reason (R): This is due to more association of carboxylic acid. Molecules through intermolecular hydrogen bonding.

Assertion(A): Carbon dioxide is non flammable gas. Reason(R):CO_(2) critical temperature is 31^(@)C and can be readily liquefied.

Assertion(A): CaCl_(2) can't be used for drying ethyl alcohol Reason (R): Hydrogen bond is formed between water and alcohol molecules.

Assertion(A): Bond angle in ethers is slightly less than the tetra hedral angle. Reason (R): There is a repulsion between the two bulkier R groups.

Assertion(A): Both alcohol and ether have higher boiling point. Reason (R): Both are having intermolecular hydrogen bonding.