Question 1

Q1. According to Arrhenius equation, increase in temperature increases rate constant because it:

Accepted Answer

Option C: increases fraction of molecules having energy ≥ Ea. Higher temperature increases the number of molecules crossing activation energy barrier, increasing rate constant.

Question 2

Q2. Molar conductivity of an electrolyte increases with dilution because:

Accepted Answer

Option B: ions move more freely with less interionic attraction. On dilution, interionic interactions reduce, increasing ion mobility and molar conductivity.

Question 3

Q3. Which coordination compound shows geometrical isomerism?

Accepted Answer

Option B: [Pt(NH3)2Cl2]. Square planar complexes like Pt(NH3)2Cl2 show cis-trans isomerism.

Question 4

Q4. Major product in dehydrohalogenation of alkyl halides follows:

Accepted Answer

Option C: Saytzeff rule. More substituted alkene (stable) is preferred as per Saytzeff rule.

Question 5

Q5. Most stable oxidation state of heavier elements in group 13 is:

Accepted Answer

Option A: +1. Inert pair effect stabilizes +1 oxidation state in heavier p-block elements.

Question 6

Q6. The emf of a cell increases when:

Accepted Answer

Option C: concentration of reactants increases. According to Nernst equation, higher reactant concentration increases cell potential.

Question 7

Q7. A 0.1 M NaCl solution shows lower van't Hoff factor than expected due to:

Accepted Answer

Option B: ion pairing. Ion pairing reduces effective number of particles in solution.

Question 8

Q8. Molecularity of a reaction is always:

Accepted Answer

Option C: positive integer. Molecularity refers to number of molecules in elementary step and is always integer.

Question 9

Q9. Shape of NH3 molecule is:

Accepted Answer

Option C: Trigonal pyramidal. One lone pair distorts tetrahedral geometry to trigonal pyramidal.

Question 10

Q10. A buffer solution resists pH change because it contains:

Accepted Answer

Option C: weak acid and its salt. Buffer maintains equilibrium between weak acid/base and conjugate salt.

Question 11

Q11. Rusting of iron can be prevented by:

Accepted Answer

Option B: galvanization. Zinc coating prevents oxidation of iron surface.

Question 12

Q12. Which functional group is present in most analgesic drugs like paracetamol?

Accepted Answer

Option B: Phenolic and amide group. Paracetamol contains phenolic –OH and amide linkage.

Question 13

Q13. Eutrophication is caused mainly by excess:

Accepted Answer

Option B: nitrogen and phosphorus compounds. Fertilizers rich in nitrates and phosphates lead to algal bloom.

Question 14

Q14. Assertion (A): Catalyst does not change equilibrium constant. Reason (R): Catalyst lowers activation energy for both forward and reverse reactions equally.

Accepted Answer

Option A: Both true and R explains A. Catalyst affects rate, not equilibrium position.

Question 15

Q15. Assertion (A): Square planar complexes show geometrical isomerism. Reason (R): Ligands in square planar geometry can occupy adjacent or opposite positions.

Accepted Answer

Option A: Both true and R explains A. cis-trans arrangement leads to geometrical isomerism.

Question 16

Q16. Case Study: A student observes that adding electrolyte increases conductivity sharply, but after dilution conductivity decreases slightly while molar conductivity increases. What explains this?

Accepted Answer

Option B: Ion mobility increases. Dilution reduces interionic attraction, increasing mobility of ions.

Question 17

Q17. Case Study: During ester hydrolysis, rate increases significantly in presence of acid but equilibrium remains unchanged. Reason:

Accepted Answer

Option B: acid acts as catalyst. Acid speeds up reaction without altering equilibrium.

Question 18

Q18. Which species has highest oxidation state stability due to inert pair effect?

Accepted Answer

Option C: Tl ⁺. Thallium prefers +1 state due to inert pair effect.

Question 19

Q19. A solution shows abnormal molar mass lower than expected. This is due to:

Accepted Answer

Option B: dissociation. Dissociation increases particle count, lowering observed molar mass.

Question 20

Q20. A first-order reaction has rate constant 0.0693 min ⁻ ¹. Its half-life is:

Accepted Answer

Option B: 10 min. t1/2 = 0.693/k = 0.693/0.0693 = 10 min

Mock Test 04 Performance Solutions

Detailed Question Analysis

Q1. According to Arrhenius equation, increase in temperature increases rate constant because it:

Q2. Molar conductivity of an electrolyte increases with dilution because:

Q3. Which coordination compound shows geometrical isomerism?

Q4. Major product in dehydrohalogenation of alkyl halides follows:

Q5. Most stable oxidation state of heavier elements in group 13 is:

Q6. The emf of a cell increases when:

Q7. A 0.1 M NaCl solution shows lower van't Hoff factor than expected due to:

Q8. Molecularity of a reaction is always:

Q9. Shape of \(\mathrm{NH_3}\) molecule is:

Q10. A buffer solution resists pH change because it contains:

Q11. Rusting of iron can be prevented by:

Q12. Which functional group is present in most analgesic drugs like paracetamol?

Q13. Eutrophication is caused mainly by excess:

Q14. Assertion (A): Catalyst does not change equilibrium constant. Reason (R): Catalyst lowers activation energy for both forward and reverse reactions equally.

Q15. Assertion (A): Square planar complexes show geometrical isomerism. Reason (R): Ligands in square planar geometry can occupy adjacent or opposite positions.

Q16. Case Study: A student observes that adding electrolyte increases conductivity sharply, but after dilution conductivity decreases slightly while molar conductivity increases. What explains this?

Q17. Case Study: During ester hydrolysis, rate increases significantly in presence of acid but equilibrium remains unchanged. Reason:

Q18. Which species has highest oxidation state stability due to inert pair effect?

Q19. A solution shows abnormal molar mass lower than expected. This is due to:

Q20. A first-order reaction has rate constant 0.0693 min ^- 1. Its half-life is:

ExamSpark Quick Chemistry Revision Signals

Quick Links & ExamSpark Resources

Mock Test 04 Performance Solutions

Detailed Question Analysis

Q1. According to Arrhenius equation, increase in temperature increases rate constant because it:

Q2. Molar conductivity of an electrolyte increases with dilution because:

Q3. Which coordination compound shows geometrical isomerism?

Q4. Major product in dehydrohalogenation of alkyl halides follows:

Q5. Most stable oxidation state of heavier elements in group 13 is:

Q6. The emf of a cell increases when:

Q7. A 0.1 M NaCl solution shows lower van't Hoff factor than expected due to:

Q8. Molecularity of a reaction is always:

Q9. Shape of \(\mathrm{NH_3}\) molecule is:

Q10. A buffer solution resists pH change because it contains:

Q11. Rusting of iron can be prevented by:

Q12. Which functional group is present in most analgesic drugs like paracetamol?

Q13. Eutrophication is caused mainly by excess:

Q14. Assertion (A): Catalyst does not change equilibrium constant. Reason (R): Catalyst lowers activation energy for both forward and reverse reactions equally.

Q15. Assertion (A): Square planar complexes show geometrical isomerism. Reason (R): Ligands in square planar geometry can occupy adjacent or opposite positions.

Q16. Case Study: A student observes that adding electrolyte increases conductivity sharply, but after dilution conductivity decreases slightly while molar conductivity increases. What explains this?

Q17. Case Study: During ester hydrolysis, rate increases significantly in presence of acid but equilibrium remains unchanged. Reason:

Q18. Which species has highest oxidation state stability due to inert pair effect?

Q19. A solution shows abnormal molar mass lower than expected. This is due to:

Q20. A first-order reaction has rate constant 0.0693 min ^- 1. Its half-life is:

ExamSpark Quick Chemistry Revision Signals

Quick Links & ExamSpark Resources

Related Study Links