94420 + Interview Questions in Chemistry in Class 12

1.	Assertion : Phenol is a weak acid than ethanol. Reason : Groups with + M effect and -I effect decrease acidity at p-position.
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 Answer :D

Discussion

2.	Assertion : Phenol and benzoic acid can be distinguished by Na_(2)CO_(3). Reason : Benzoic acid is stronger acid than phenol, hence reacts with Na_(2)CO_(3).
Answer» If both ASSERTION and reason are TRUE and reason is the CORRECT explanation of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. ANSWER :A

Discussion

3.	Assertion: Phenol forms 2,4,6-tribromophenol on treatment with Br_(2) in carbon disulphide at 273K. Reason: Bromine polarises in carbon disulphide.
Answer» ASSERTION and reason both are correct and reason is correct explanation of assertion.<BR>Assertion and reason both are wrong statement. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Solution :Correct assertion. Phenol forms 2,4,6-tribromophenol on treatment with `Br_(2)` in water. Correct reason. In `H_(2)O`, phenoxide ion is FORMED which highly ACTIVATES it towards electrophilic substitution reaction.

Discussion

4.	Assertion : PHBV is a biodegradablepolymer. Reason : PHBV is an aliphatic polyester .
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. Answer :A

Discussion

5.	Assertion: (Ph_3P)_3RhCl is Wilkinson's catalyst. Reason: (Ph_3P)_3RhCl can show optical isomerism but does not show geometrical isomerism.
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 :C

Discussion

6.	Assertion : PH_(5) is not possible. Reason : -5 oxidation state of phosphorusis not possible.
Answer» Both assertion and REASON are TRUE and reason is the correct explanation of the assertion Both assertion and reason are true and reason is not the correct explanation of the assertion. Assertion is true but reason is false Both assertion and reason are false. Answer :A::B::C::D

Discussion

7.	Assertion : PH_(4)^(+) ion is having tetrahedron geometry. Reason : P-atom is unhybridised in PH_(4)^(+) ion.
Answer» If ASSERTION is true but the reason is false If assertion is false but reason is true IF both assertion and reason are true and the reason is the CORRECT EXPLANATION of assertion If both assertion and reason are true but reason is not the correct explanation of assertion Answer :A

Discussion

8.	Assertion : pH of hydrochloric acid solution is less than that of acetic acid solution of the same concentration . Reason : In equimolar solutions, the number of titrable protons present in hydrochloric acid is less than that present in acetic acid.
Answer» If both assertion and reason are true and reason is the correct EXPLANATION of the assertion If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is false. If the assertion and reason both are false. Solution :HCl is a strong electrolyte since it will produce more `H^(+)`, COMPARISON than that of `CH_(3)COOH`. HENCE assertion is true but reason false.

Discussion

9.	Assertion : PF_(5) and IF_(5) have similar shapes. Reason : All the bond lengths are equal in PF_(5).
Answer» Both assertion and REASON are TRUE and reason is the correct EXPLANATION of the assertion Both assertion and reason are true and reason is not the correct explanation of the assertion. Assertion is true but reason is false Both assertion and reason are false. Answer :A::B::D

Discussion

10.	Assertion : pH of acetic acid decreases with dilution. Reason : On dilution, degree of ionisationof acetic acid decreases.
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

11.	Assertion : PF_(3) is stronger lewis base than PH_(3). Reason : l.p. of P-atom in PF_(3) molecule is present in sp^(3)-hybrid orbital, whereas l.p. of P-atom in PH_(3) is present in almost pure s-orbital.
Answer» If assertion is TRUE but the reason is FALSE If assertion is false but reason is true If both assertion and reason are true and the reason is the CORRECT explanation of assertion If both assertion and reason are true and the reason is not the correct explanation of assertion Answer :B

Discussion

12.	Assertion : Pentan-2-one and pentan-3-one can be distinguished by iodoform test. Reason : Only methylketines take part in iodoform reaction.
Answer» If both ASSERTION and REASON are CORRECT and reason is correct EXPLANATION for assertion. If both assertion and reason are correct and reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. If assertion as WELL as reason are both incorrect. Solution :Reason is correct explanation for assertion.

Discussion

13.	Assertion : Penicillin (G) is an antihistamine Reason: Penicillin (G) is effective against gram positive as well as gram negative bacteria.
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 : Correct assertion. PENICILLIN (G) is an antibiotic. Correct reason. Penicillin is effective against some gram positive BACTERIA.

Discussion

14.	Assertion : PbSiF_(6)+H_(2)SiF_(6)+ gelatine is taken as electrolyte in electrolytic refining of lead. Reason : Discharge potential of Pb^(2+) is less than H^(+).
Answer» If both ASSETION and reason are CORRECT, and reason is the CORRECT explanation of the ASSERTION If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion If assertion is CORRECT but reason is INCORRECT If assertion is INCORRECT but reason is CORRECT Answer :C

Discussion

15.	Assertion: Path (a) is better than path (b) to prepare (Y) and (X). . (b). Reason: Iodide ion (I^(-)) is both an excellent nucleophile as well as leaving group.
Answer» If both ASSERTION and REASON are CORRECT and reason is correct EXPLANATION for assertion If both assertion and reason are correct but reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. if both assertion and reason are incorrect. Solution :Reason is the correct explanation for assertion.

Discussion

16.	Assertion. P_(4) is more reactive than N_(2) Reason. P-P single bond is much weaker as compared to N -= N triple bond.
Answer» If both assertion and reason are true, and reason is the correct EXPLANATION of the assertion. If both assertion and reason are ture, but reason is not the correct EXPLANANTION of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Answer :A

Discussion

17.	Assertion: p-Toluidine is a stronger base than m-toluidine. Reason: Methyl group from m-position exerts smaller electron-donating inductive (+I)-effect than from p-position.
Answer» If both assertion and reason are TRUE, and reason is the true explanation of the assertion. If both assertion and reason are TURE, 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 explanation: `CH_(3)` group exerts greater +I-effect from m-position than p-position. However, it is the stronger hyperconjugation effect of the `CH_(3)` group from p-position which increases the BASIC strength of p-toluidine w.r.t. m-toluidne.

Discussion

18.	Assertion: p-O_(2)N-C_(6)H_(5)COCH_(3) is prepared by Friedel Crafts acylation of nitrobenzene. Reason: Nitrobenzene easily undergoes electrophilic substituion reaction.
Answer» Solution :The nitro group strongly DEACTIVATES the beznene ring TOWARDS electrophilic SUBSTITUTION. Nitrobenzene does not UNDERGO Friedel-Craft acelation REACTION.

Discussion

19.	Assertion: p-Nitrophenol is more acidic than phenol. Reason: Nitro group helps in the stabilisation of the phenoxide ion by dispersal of negative charge due to resonance.
Answer» Assertion and REASON both are CORRECT and reason is correct explanation of assertion. Assertion and reason both are wrong STATEMENT. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Solution :Reason is the correct explanation of assertion.

Discussion

20.	Assertion : p-N,N - dimethyl aminobenzaldehyde undergo benzoic condensation Reason : The aldehydic (-CHO) group is meta directing
Answer» If both ASSERTION and REASON are true and reason in the CORRECT EXPLANATION assertion If both assertion and reason are true but reason is not the correct explanation of assertion Assertion is true but reason is false Both assertion andreason are false Solution :

Discussion

21.	Assertion: p-nitrophenol is a stronger acid than o-nitrophenol. Reason: Intramolecular hydrogen bonding makes the o-isomer weaker than the p-isomer.
Answer» Both ASSERTION and STATEMENT are true and statement is the correct Assertion is correct and statement is WRONG, statement is not the correct EXPLANATION of assertion Assertion is wrong and statement is correct, statement is not the correct explanation of assertion Both assertion and statement are wrong and statement is not the correct explanation of assertion Solution :Both assertion and statement are correct , and statement is an explanation of assertion.

Discussion

22.	Assertion: p-Nitrophenol is a stronger acid than o-nitrophenol. Reason: Intramolecular hydrogen bonding makes o-isomer weaker than p-isomer.
Answer» If both ASSERTION and REASON are TRUE, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation o the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Answer :A

Discussion

23.	Assertion: p-dichloroebenzene is less soluble in organic solvents than the corresponding o-isomer. Reason: o-dichlorobenzene is polar while p-dichlorobenzene is not.
Answer» If both assertion and REASON are CORRECT and reason is correct explanation for assertion If both assertion and reason are correct but reason is not correct explanation for assertion. If assertion is correct but reason is incorrect. if both assertion and reason are incorrect. Solution :Correct explanation. The structure of p-dichlorobenzene is more symmetrical than that of ortho ISOMER. Being a solid, its crystal lattice is more stable and THEREFORE GREATER energy is needed to break the lattice. Therefore it is less soluble.

Discussion

24.	Assertion: p-Dichlorobenzene is less soluble in organic solvents than the corresponding o-isomer. Reason: o-Dichlorobenzene is polar while p-dichlorobenzene is non-polar.
Answer» If both assertionn and reason are true, and reason is the true explanation of the ASSERTION. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and Reason are false. Solution :Correct explanation. Being symmetrical, p-dichlorobenzene MOLECULES fit closely in the crystal lattice and hence has stronger INTERMOLECULAR forces of attraction than those of o-dichlorobenzene. As a result, large amount of ENERGY is needed to dissolve p- than o-isomer.

Discussion

25.	Assertion: p-Chlorobenzoic acid is stronger than benzoic acid. Reason: Chlorine has electron-donating resonance (+R)- effect.
Answer» if both assertion and reson are TRUE, and reason is the true EXPLANATION of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. if assertion is true, but reason is false. If both assertion and reason are false. Solution :CORRECT explanation: Chlorine has both +R-effect and -I-effect but -I-effect outweighs +R-effect. As a RESULT, p-chlorobenzoic acid is a stronger acid than benzoic acid.

Discussion

26.	Assertion. Ozone is a powerful oxidising agent in comparison to O_(2) Reason. Ozone is diamagnetic but O_(2) is paramagnetic.
Answer» If both ASSERTION and reason are TRUE, and reason is the correct explanation of the assertion. If both assertion and reason are TURE, but reason is not the correct explanantion of the assertion. If assertion is true, but reason is false. If both assertion and reason are false Solution :Correct explanation. `O_(3)` READILY liberates more energetic nascent oxygen and hence is a stronger OXIDISING agent than `O_(2)`.

Discussion

27.	Assertion: Oximes are less acidic than hydroxyl amine. Reason: Oximes of aldehydes and ketones show geometrical isomerism.
Answer» If both assertion and reason are true and the reason is the correct explanation of the assertion If both assertion and reason are true but reason is not the correct explanation of the assertion If assertion is true but reason is FALSE If assertion is false but reason is true Solution :Oximes are more acidic because, there is a delocalisation of `pi` electrons (i.e., resonance) and it stabilises it and its conjugate acid. But no such resonance exists in hydroxyl AMINE base `(NH_(2)O^(-))`

Discussion

28.	Assertion: Oxidation state of Fe in Fe(CO)_(5) is zero. Reason: Synergic bonding takes place in this metal carbonyl complex.
Answer» If assertion is true but the REASON is FALSE If assertion is false but reason is true If both assertion and reason are true and the reason is the CORRECT EXPLANATION of assertion If both assertion and reason are true but reason is not the correct explanation of assertion Answer :D

Discussion

29.	Assertion. Oxidation state of Fein Fe(CO)_(5) is zero. Reason. EAN of Fe in this complex is 36.
Answer» If both ASSERTION and reason are true, but reason is not the true EXPLANATION of the assertion If both assertion and reason are true, but reason is not the true explanation of the assertion If assertionis true, but reason is false If both assertion and reason are false Solution :A is true because CO is neutral ligand. R is true because EAN of Fe At. No. of Fe + Electrons gained by coordination = `26+2xx5=36` But R is not the CORRECT explanation. Correct explanation. Oxidation STATE of Fe in `Fe(CO)_(5)` is zero because CO is a neutral ligand.

Discussion

30.	Assertion : Ostwald's dilution law is K_a=(alpha^2 C)/(1-alpha) Reason : Ostwald's dilution law is applicable only to strong electrolyte.
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 :C

Discussion

31.	Assertion: Orhto nitrphenol molecules are associated due to the presence of intermolecularhydrogen bonding while para-nitrophenol involves intramolecular, hydrogen bonding Reason: Ortho nitrophenol is more volatile than the para nitrophenol.
Answer» If both ASSERTION and REASON are TRUE and the reason is the correct explanation of the assertion if both assertion and reason are true but reason is not the correct explanation of the assertion if assertion is true but reason is false if assertion is false but reason in true. Answer :D

Discussion

32.	Assertion : Ortho and Para dihydrogen are nuclear spin isomers. Reason : They have same nuclear spins.
Answer» If both ASSERTION & REASON are TRUE & the Reason is a CORRECT explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are False. Answer :C

Discussion

33.	Assertion. Out of various colligative properties, osmotic pressure is used for determination of molecular masses of polymers.
Answer» If both assertion and reason are true, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false. Solution :Correct explanation. Due to high molar MASSES of polymers, the elevation in BOILING point or depression in FREEZING point are so LOW that they cannot be measured accurately.

Discussion

34.	Assertion : Out of various colligative properties, only osmotic pressure is used to determine the molecular masses of polymers. Reason : Ploymer solutions donot possiss a contant boiling point of freezing point.
Answer» If both ASSERTION are reason are correct and reason is correct EXPLANATION for assertion. If both assertion and reason are corrct but reason is not correct explanation for assertion. If assertion is corrct but reason is incorrect. If assertion and reason both are incrrect. Solution :Correct Reason. Ploymer solutions have very small elevation in BOILING point and depression in FREEZING point.

Discussion

35.	Assertion: Osmotic pressure is a colligative property. Reason:Osmotic pressure depends only on the number of non volatile particles dissolved in solution
Answer» Both ASSERTION and REASON are true and Reason is the correct explanation of Assertion Both Assertion and Reason are true and Reason is not the correct explanation of Assertion Assertion is true but Reason is FALSE Both Assertion and Reason are false Answer :A

Discussion

36.	Assertion : Ores are generally converted into oxides, prior to reduction. Reason : Metal oxides can be easily reduced.
Answer» If both ASSETION and REASON are CORRECT, and reason is the CORRECT EXPLANATION of the assertion If both assertion and reason are CORRECT, but reason is NOT the CORRECT explanation of the assertion If assertion is CORRECT but reason is INCORRECT If assertion is INCORRECT but reason is CORRECT Answer :C

Discussion

37.	Assertion. Order of a reaction can be fractional but molecularity is never fractional. Reason. Order of reaction does not depend upon the stoichiometric coefficients of the balanced equation.
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 :R is the correct explanation of A.

Discussion

38.	Assertion : Order of the reaction can be zero or fractional. Reason : We cannot determine order from balanced chemical equation.
Answer» Both assertion and REASON are correct and the reason is correct explananation of assertion. Both assertion and reason are correct but reason does not EXPLAIN assertion. Assertion is correct but reason is incorrect. Both assertion and reason are incorrect. Solution :Correct EXPLANATION. RATE of REACTION may not depend upon the concentration of a reactant or may depend upon fractional power of molar concentration.

Discussion

39.	Assertion : Order and molecularity of a reaction are always equal. Reason : Complex reactions takes place in steps and fastest step determine the molecularity of reaction.
Answer» Both assertion and reason are TRUE and reason is the CORRECT EXPLANATION of assertion. Both assertion and reason are true but reason is not the correct explanation of assertion. Assertion is true but reason is FALSE. Both assertion and reason are false. Answer :D

Discussion

40.	Assertion : Order and molecularity are same. Reason : Order is determined experimentally and molecularity is the sum of the stoichiometric coeddicient of rate determining elementary step.
Answer» Both assertion and reason are TRUE and reason is the CORRECT EXPLANATION of assertion. Both assertion and reason are true but reason is not the correct explanation of assertion. Assertion is true but reason is false. Both assertion and reason are false. ANSWER :D

Discussion

41.	Assertion : Order and molecularity are same. Reason : Order is determined experimentally and molecularity is the sum of the stoichiometric coefficients of rate determining elementary step.
Answer» Both ASSERTION and reason are correct and the reason is correct explananation of assertion. Both assertion and reason are correct but reason does not explain assertion. Assertion is correct but reason is incorrect. Assertion is incorrect but reason is correct. Solution :Correct Assertion. Order MAY or may not be EQUAL to MOLECULARITY.

Discussion

42.	Assertion: Optical isomerism is not shown by square planar complexes. Reason:Square planar complexes do not possess chiral structures.
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 :A

Discussion

43.	Assertion: Only a small amount of HCl is required in the reduction of nitro compounds with iron scrap. Reason: FeCl_(2) formed gets hydrolysed to release HCl during the reaction.
Answer» Both ASSERTION and reason are WRONG. Both assertion and reason are CORRECT STATEMENTS but reason is not correct explanation of assertion. Assertion is correct statement but reason is wrong statement. Both assertion and reason are correct statements and reason is correct explanation of assertion. Solution :Reason is the correct explanation of the assertion.

Discussion

44.	Assertion : One mole of SO_(2) contains double the number of molecules present in one mole of O_(2) Reason : Molecular weight of SO_(2) is double to that of O_(2).
Answer» If both assertion and reason are true and the reason is the CORRECT explanation of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is FALSE. If assertion is false but reason is true. Solution :One mole of any substance corresponding to `6.023xx10^(23)` entities is respective of its weight. MOLECULAR weight of `SO_(2)=32+2xx16=64 gm`. Molecular weight of `O_(2)=16xx2=32 gm`. `:.` Molecular weight of `SO_(2)` is double to that of `O_(2)`.

Discussion

45.	Assertion. One molar aqueous solution has always higher concentration than one molal. Reason. The molality of a solution depends upon the density of the solution whereas molarity does not.
Answer» If both ASSERTION and reason are true, and reason is the true explanation of the assertion. If both assertion and reason are true, but reason is not the true explanation of the assertion. If assertion is true, but reason is false. If both assertion and reason are false. Solution :Correct explanation. One molar AQUEOUS solution CONTAINS one mole of the SOLUTE in 1000 mL of the solution whereas one molal solution contains one mole of the solute in 1000 g of the solvent. Thus, solvent present in one molar solution is LESS than 1000 mL. Hence, concentration is more.

Discussion

46.	Assertion: One molar aqueous solution (d=1gm/cc) has always higher concentration than one molal. Reason:The molality of a solution does not depends on temperature whereas molarity depends
Answer» Both Assertion and Reason are true and Reason is the correct EXPLANATION of Assertion Both Assertion and Reason are true and Reason is not the correct explanation of Assertion Assertion is true but Reason is false Both Assertion and Reason are false Answer :B

Discussion

47.	Assertion :- One molal aqueous solution of glucose contains 180g of glucose in 1 kg water. Reason :- Solution containing one mole of solute in 1000g of solvent is called one molal solution.
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 :MOLALITY `=("NUMBER of moles of sollute")/("weight of solvent (in kg)")` If number of moles of solute = 1 Weight of solvent = 1 kg then, molality = 1, i.e., one molala For glucose `(C_(6)H_(12)O_(6))` , molecular weight = 180 number of moles `=(180)/(180)=1`, weight of water = 1 kg Hence, molality of the solution is one.

Discussion

48.	Assertion :- One molal aqueous solution of urea contains 60g of urea in 1kg (1000 g) water. Reason :- Solution containing one mole of solute in 1000g solvent is called as one molal solution.
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 :Molecular weight of urea `(NH_(2)CONH_(2))` `=14+2+12+16+14+2=60` Number of moles `=("Weight")/("molecular weight")=(60)/(60)=1`

Discussion

49.	Assertion : One atomic mass unit (amu) is mass of an atom equal to exactly one-twelfth the mass of a carbon -12 atom. Reason : Carbon-12 isotope was selected as standard.
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 :For universally accepted atomic mass unit in 1961, `C-12` was SELECTED as standard. However the NEW SYMBOL used is 'u' (unified mass) in place of amu.

Discussion

50.	Assertion: One coulomb of electric charge deposits wegiht equal to the electrochemical equivalent of the substance. Reason: One faraday deposits one mole of the substance.
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 :One Faraday DEPOSITS one gram equivalent of the substance.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Assertion : Phenol is a weak acid than ethanol. Reason : Groups with + M effect and -I effect decrease acidity at p-position.

Assertion : Phenol and benzoic acid can be distinguished by Na_(2)CO_(3). Reason : Benzoic acid is stronger acid than phenol, hence reacts with Na_(2)CO_(3).

Assertion: Phenol forms 2,4,6-tribromophenol on treatment with Br_(2) in carbon disulphide at 273K. Reason: Bromine polarises in carbon disulphide.

Assertion : PHBV is a biodegradablepolymer. Reason : PHBV is an aliphatic polyester .

Assertion: (Ph_3P)_3RhCl is Wilkinson's catalyst. Reason: (Ph_3P)_3RhCl can show optical isomerism but does not show geometrical isomerism.

Assertion : PH_(5) is not possible. Reason : -5 oxidation state of phosphorusis not possible.

Assertion : PH_(4)^(+) ion is having tetrahedron geometry. Reason : P-atom is unhybridised in PH_(4)^(+) ion.

Assertion : pH of hydrochloric acid solution is less than that of acetic acid solution of the same concentration . Reason : In equimolar solutions, the number of titrable protons present in hydrochloric acid is less than that present in acetic acid.

Assertion : PF_(5) and IF_(5) have similar shapes. Reason : All the bond lengths are equal in PF_(5).

Assertion : pH of acetic acid decreases with dilution. Reason : On dilution, degree of ionisationof acetic acid decreases.

Assertion : PF_(3) is stronger lewis base than PH_(3). Reason : l.p. of P-atom in PF_(3) molecule is present in sp^(3)-hybrid orbital, whereas l.p. of P-atom in PH_(3) is present in almost pure s-orbital.

Assertion : Pentan-2-one and pentan-3-one can be distinguished by iodoform test. Reason : Only methylketines take part in iodoform reaction.

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

Assertion : PbSiF_(6)+H_(2)SiF_(6)+ gelatine is taken as electrolyte in electrolytic refining of lead. Reason : Discharge potential of Pb^(2+) is less than H^(+).

Assertion: Path (a) is better than path (b) to prepare (Y) and (X). . (b). Reason: Iodide ion (I^(-)) is both an excellent nucleophile as well as leaving group.

Assertion. P_(4) is more reactive than N_(2) Reason. P-P single bond is much weaker as compared to N -= N triple bond.

Assertion: p-Toluidine is a stronger base than m-toluidine. Reason: Methyl group from m-position exerts smaller electron-donating inductive (+I)-effect than from p-position.

Assertion: p-O_(2)N-C_(6)H_(5)COCH_(3) is prepared by Friedel Crafts acylation of nitrobenzene. Reason: Nitrobenzene easily undergoes electrophilic substituion reaction.

Assertion: p-Nitrophenol is more acidic than phenol. Reason: Nitro group helps in the stabilisation of the phenoxide ion by dispersal of negative charge due to resonance.

Assertion : p-N,N - dimethyl aminobenzaldehyde undergo benzoic condensation Reason : The aldehydic (-CHO) group is meta directing

Assertion: p-nitrophenol is a stronger acid than o-nitrophenol. Reason: Intramolecular hydrogen bonding makes the o-isomer weaker than the p-isomer.

Assertion: p-Nitrophenol is a stronger acid than o-nitrophenol. Reason: Intramolecular hydrogen bonding makes o-isomer weaker than p-isomer.

Assertion: p-dichloroebenzene is less soluble in organic solvents than the corresponding o-isomer. Reason: o-dichlorobenzene is polar while p-dichlorobenzene is not.

Assertion: p-Dichlorobenzene is less soluble in organic solvents than the corresponding o-isomer. Reason: o-Dichlorobenzene is polar while p-dichlorobenzene is non-polar.

Assertion: p-Chlorobenzoic acid is stronger than benzoic acid. Reason: Chlorine has electron-donating resonance (+R)- effect.

Assertion. Ozone is a powerful oxidising agent in comparison to O_(2) Reason. Ozone is diamagnetic but O_(2) is paramagnetic.

Assertion: Oximes are less acidic than hydroxyl amine. Reason: Oximes of aldehydes and ketones show geometrical isomerism.

Assertion: Oxidation state of Fe in Fe(CO)_(5) is zero. Reason: Synergic bonding takes place in this metal carbonyl complex.

Assertion. Oxidation state of Fein Fe(CO)_(5) is zero. Reason. EAN of Fe in this complex is 36.

Assertion : Ostwald's dilution law is K_a=(alpha^2 C)/(1-alpha) Reason : Ostwald's dilution law is applicable only to strong electrolyte.

Assertion: Orhto nitrphenol molecules are associated due to the presence of intermolecularhydrogen bonding while para-nitrophenol involves intramolecular, hydrogen bonding Reason: Ortho nitrophenol is more volatile than the para nitrophenol.

Assertion : Ortho and Para dihydrogen are nuclear spin isomers. Reason : They have same nuclear spins.

Assertion. Out of various colligative properties, osmotic pressure is used for determination of molecular masses of polymers.

Assertion : Out of various colligative properties, only osmotic pressure is used to determine the molecular masses of polymers. Reason : Ploymer solutions donot possiss a contant boiling point of freezing point.

Assertion: Osmotic pressure is a colligative property. Reason:Osmotic pressure depends only on the number of non volatile particles dissolved in solution

Assertion : Ores are generally converted into oxides, prior to reduction. Reason : Metal oxides can be easily reduced.

Assertion. Order of a reaction can be fractional but molecularity is never fractional. Reason. Order of reaction does not depend upon the stoichiometric coefficients of the balanced equation.

Assertion : Order of the reaction can be zero or fractional. Reason : We cannot determine order from balanced chemical equation.

Assertion : Order and molecularity of a reaction are always equal. Reason : Complex reactions takes place in steps and fastest step determine the molecularity of reaction.

Assertion : Order and molecularity are same. Reason : Order is determined experimentally and molecularity is the sum of the stoichiometric coeddicient of rate determining elementary step.

Assertion : Order and molecularity are same. Reason : Order is determined experimentally and molecularity is the sum of the stoichiometric coefficients of rate determining elementary step.

Assertion: Optical isomerism is not shown by square planar complexes. Reason:Square planar complexes do not possess chiral structures.

Assertion: Only a small amount of HCl is required in the reduction of nitro compounds with iron scrap. Reason: FeCl_(2) formed gets hydrolysed to release HCl during the reaction.

Assertion : One mole of SO_(2) contains double the number of molecules present in one mole of O_(2) Reason : Molecular weight of SO_(2) is double to that of O_(2).

Assertion. One molar aqueous solution has always higher concentration than one molal. Reason. The molality of a solution depends upon the density of the solution whereas molarity does not.

Assertion: One molar aqueous solution (d=1gm/cc) has always higher concentration than one molal. Reason:The molality of a solution does not depends on temperature whereas molarity depends

Assertion :- One molal aqueous solution of glucose contains 180g of glucose in 1 kg water. Reason :- Solution containing one mole of solute in 1000g of solvent is called one molal solution.

Assertion :- One molal aqueous solution of urea contains 60g of urea in 1kg (1000 g) water. Reason :- Solution containing one mole of solute in 1000g solvent is called as one molal solution.

Assertion : One atomic mass unit (amu) is mass of an atom equal to exactly one-twelfth the mass of a carbon -12 atom. Reason : Carbon-12 isotope was selected as standard.

Assertion: One coulomb of electric charge deposits wegiht equal to the electrochemical equivalent of the substance. Reason: One faraday deposits one mole of the substance.