NEET CHEMISTRY QUIZ 1 AUGUST 11

Chemistry Test 29

Redox Reaction — Theory Questions

Instructions: Answer all 10 questions. Click Submit Test to see your score and the correct answers.

1. Which statement correctly describes oxidation?

A) Gain of electrons B) Loss of electrons C) Decrease in oxidation number D) Gain of protons

Correct Answer: B) Loss of electrons

2. Which statement about a redox reaction is correct?

A) Only oxidation occurs B) Only reduction occurs C) Oxidation and reduction occur simultaneously D) Neither oxidation nor reduction occurs

Correct Answer: C) Oxidation and reduction occur simultaneously

3. Which element always exhibits a negative oxidation state in its compounds?

A) Nitrogen B) Oxygen C) Fluorine D) Chlorine

Correct Answer: C) Fluorine

4. Which electrode is the site of reduction in an electrochemical cell?

A) Anode B) Cathode C) Salt bridge D) Electrolyte

Correct Answer: B) Cathode

5. Which statement correctly describes a reducing agent?

A) It gains electrons and is reduced B) It loses electrons and is oxidised C) It always has a positive charge D) It prevents oxidation

Correct Answer: B) It loses electrons and is oxidised

6. Which of the following is a disproportionation reaction?

A) A reaction in which an element undergoes only oxidation B) A reaction in which an element undergoes only reduction C) A reaction in which the same element is both oxidised and reduced D) A reaction involving only acid-base neutralisation

Correct Answer: C) A reaction in which the same element is both oxidised and reduced

7. Why does H₂SO₄ show oxidising behaviour with HI?

A) Sulphur is reduced while iodine is oxidised B) Sulphur is oxidised while iodine is reduced C) Both sulphur and iodine are reduced D) Neither element changes oxidation state

Correct Answer: A) Sulphur is reduced while iodine is oxidised

8. Which statement about oxygen's oxidation number is correct?

A) Oxygen is always −2 in every compound B) Oxygen is always +2 in compounds C) Oxygen is usually −2, but has exceptions such as peroxides and superoxides D) Oxygen always has oxidation number zero

Correct Answer: C) Oxygen is usually −2, but has exceptions such as peroxides and superoxides

9. What is the oxidation number of Mn in KMnO₄?

A) +5 B) +6 C) +7 D) +8

Correct Answer: C) +7

10. Why is fluorine considered the best oxidising agent?

A) It has the highest reduction potential B) It has the highest oxidation potential C) It has the largest atomic size D) It has the lowest electronegativity

Correct Answer: A) It has the highest reduction potential