Question 1

Q1. The unit of rate constant for a second-order reaction is:

Accepted Answer

Option C: L mol ⁻ ¹ s ⁻ ¹. For second-order reactions, rate constant has unit L mol ⁻ ¹ s ⁻ ¹.

Question 2

Q2. Which electrolyte produces the highest number of ions on complete dissociation?

Accepted Answer

Option C: AlCl ₃. AlCl ₃ → Al³ ⁺ + 3Cl ⁻ gives 4 ions per formula unit.

Question 3

Q3. In crystal field theory, pairing energy is overcome when:

Accepted Answer

Option C: Δ ₀ > P. Strong field ligands cause pairing when crystal field splitting energy exceeds pairing energy.

Question 4

Q4. The strongest oxidizing agent among halogens is:

Accepted Answer

Option A: F ₂. Fluorine has highest electronegativity and oxidizing power.

Question 5

Q5. Which polymer is naturally occurring?

Accepted Answer

Option C: Starch. Starch is a natural polysaccharide polymer.

Question 6

Q6. A reaction follows first-order kinetics. If concentration is doubled, rate will:

Accepted Answer

Option B: double. Rate ∝ concentration for first-order reaction.

Question 7

Q7. Molar conductivity increases on dilution because:

Accepted Answer

Option B: ion mobility increases. Dilution reduces interionic attraction, increasing mobility.

Question 8

Q8. Which complex shows optical isomerism?

Accepted Answer

Option C: [Cr(en)3]3+. Chelating ligand ethylenediamine allows optical isomerism.

Question 9

Q9. Which compound shows hydrogen bonding?

Accepted Answer

Option C: NH3. N–H bond enables hydrogen bonding in ammonia.

Question 10

Q10. Oxidation state of Cr in K2Cr2O7 is:

Accepted Answer

Option C: +6. Let Cr = x → 2x + 2(+1) + 7(-2) = 0 → x = +6.

Question 11

Q11. Rusting of iron is accelerated by:

Accepted Answer

Option C: presence of electrolytes like NaCl. Electrolytes increase corrosion rate.

Question 12

Q12. Which drug is an analgesic?

Accepted Answer

Option A: Paracetamol. Paracetamol reduces pain and fever.

Question 13

Q13. Biomagnification is maximum in:

Accepted Answer

Option D: tertiary consumers. Toxic substances increase at higher trophic levels.

Question 14

Q14. Assertion (A): Molecularity is always a whole number. Reason (R): It represents number of molecules involved in elementary step.

Accepted Answer

Option A: Both true and R explains A. Molecularity refers to actual reacting species in a step.

Question 15

Q15. Assertion (A): Catalyst changes equilibrium constant. Reason (R): Catalyst increases rate of both forward and reverse reactions equally.

Accepted Answer

Option B: A false R true. Catalyst does not affect equilibrium constant.

Question 16

Q16. Case Study: A student adds electrolyte to water and observes increased boiling point elevation. Reason:

Accepted Answer

Option B: increase in particle number. More particles → higher colligative effect.

Question 17

Q17. Case Study: In a reversible reaction, addition of catalyst speeds up attainment of equilibrium. Why?

Accepted Answer

Option B: lowers activation energy equally. Catalyst accelerates both directions equally.

Question 18

Q18. Which has maximum conductivity?

Accepted Answer

Option B: HCl. HCl is a strong electrolyte.

Question 19

Q19. For first-order reaction, half-life is:

Accepted Answer

Option B: independent of initial concentration. t1/2 = 0.693/k, constant.

Question 20

Q20. Which compound shows strongest intermolecular forces?

Accepted Answer

Option B: H2O. Water exhibits hydrogen bonding.

Mock Test 05 Performance Solutions

Detailed Question Analysis

Q1. The unit of rate constant for a second-order reaction is:

Q2. Which electrolyte produces the highest number of ions on complete dissociation?

Q3. In crystal field theory, pairing energy is overcome when:

Q4. The strongest oxidizing agent among halogens is:

Q5. Which polymer is naturally occurring?

Q6. A reaction follows first-order kinetics. If concentration is doubled, rate will:

Q7. Molar conductivity increases on dilution because:

Q8. Which complex shows optical isomerism?

Q9. Which compound shows hydrogen bonding?

Q10. Oxidation state of Cr in \(\mathrm{K_2Cr_2O_7}\) is:

Q11. Rusting of iron is accelerated by:

Q12. Which drug is an analgesic?

Q13. Biomagnification is maximum in:

Q14. Assertion (A): Molecularity is always a whole number. Reason (R): It represents number of molecules involved in elementary step.

Q15. Assertion (A): Catalyst changes equilibrium constant. Reason (R): Catalyst increases rate of both forward and reverse reactions equally.

Q16. Case Study: A student adds electrolyte to water and observes increased boiling point elevation. Reason:

Q17. Case Study: In a reversible reaction, addition of catalyst speeds up attainment of equilibrium. Why?

Q18. Which has maximum conductivity?

Q19. For first-order reaction, half-life is:

Q20. Which compound shows strongest intermolecular forces?

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Mock Test 05 Performance Solutions

Detailed Question Analysis

Q1. The unit of rate constant for a second-order reaction is:

Q2. Which electrolyte produces the highest number of ions on complete dissociation?

Q3. In crystal field theory, pairing energy is overcome when:

Q4. The strongest oxidizing agent among halogens is:

Q5. Which polymer is naturally occurring?

Q6. A reaction follows first-order kinetics. If concentration is doubled, rate will:

Q7. Molar conductivity increases on dilution because:

Q8. Which complex shows optical isomerism?

Q9. Which compound shows hydrogen bonding?

Q10. Oxidation state of Cr in \(\mathrm{K_2Cr_2O_7}\) is:

Q11. Rusting of iron is accelerated by:

Q12. Which drug is an analgesic?

Q13. Biomagnification is maximum in:

Q14. Assertion (A): Molecularity is always a whole number. Reason (R): It represents number of molecules involved in elementary step.

Q15. Assertion (A): Catalyst changes equilibrium constant. Reason (R): Catalyst increases rate of both forward and reverse reactions equally.

Q16. Case Study: A student adds electrolyte to water and observes increased boiling point elevation. Reason:

Q17. Case Study: In a reversible reaction, addition of catalyst speeds up attainment of equilibrium. Why?

Q18. Which has maximum conductivity?

Q19. For first-order reaction, half-life is:

Q20. Which compound shows strongest intermolecular forces?

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