Chemistry

Question 1

1Hydrogen peroxide can act as both an oxidising and a reducing agent.

Hard

A. True B. False

Question 2

2A disproportionation reaction is one in which

Hard

A. two different metals are oxidised B. no electrons are transferred C. the same element is both oxidised and reduced D. only oxygen is involved

Question 3

3The rusting of iron is a redox reaction.

Easy

A. True B. False

Question 4

4What is the oxidation number of C in CO₂?

Medium

A. +2 B. −4 C. +4 D. +5

Question 5

5An oxidising agent

Easy

A. accepts electrons and is itself reduced B. is itself oxidised C. loses electrons D. always contains oxygen

Question 6

6The oxidation number of Fe in Fe₂O₃ is ___.

Medium

Your answer (fill in the blank)

Question 7

7The oxidation number of P in P₂O₅ is ___.

Medium

Your answer (fill in the blank)

Question 8

8The oxidation number of Cl in ClO⁻ is ___.

Medium

Your answer (fill in the blank)

Question 9

9The oxidation number of N in NH₄⁺ is ___.

Medium

Your answer (fill in the blank)

Question 10

10In Zn + Cu²⁺ → Zn²⁺ + Cu, the species oxidised is

Easy

A. Zn B. Zn²⁺ C. Cu D. Cu²⁺