Free Printable Redox Reactions

1.

Choose the RIGHT statement

a)

in a redox reaction, there must be addition or removal of oxygen

b)

the nature of redox reaction is the increase of element's oxidation number

c)

if the oxidation number of an element changes, it is a redox reaction

d)

an oxidising agent is oxidised in a redox reaction

2.

Which particles DOES NOT have reducing power?

a)

chloride ion

b)

hydrogen ion

c)

chlorine water

d)

hydrogen gas

3.

Which compound has manganese with oxidation number +6?

a)

$K_2MnO_4$

b)

$KMnO_4$

c)

$MnO_{2\ }$

d)

$MnCl_{2\ }$

4.

Which one below is BOTH oxidising agent and reducing agent?

a)

$Na$

b)

$SO_{2\ }$

c)

$Cl_{2\ }$

d)

$CO_{2\ }$

5.

In which reaction below, the oxidation number of nitrogen changes from +5 to +2?

a)

$2NO+O_2\longrightarrow2NO_{2\ }$

b)

$N_2+3Mg\longrightarrow Mg_3N_2$

c)

$4NH_3+5O_2\longrightarrow4NO+6H_2O$

d)

$Cu+4HNO_3\longrightarrow Cu\left(NO_3\right)_{2\ }+2NO+2H_2O$

6.

Which one below is redox reaction?

a)

$CaCO_3+2HCl\longrightarrow CaCl_2+CO_2+H_2O$

b)

$CaO+H_2O\longrightarrow Ca\left(OH\right)_2$

c)

$SO_2+2H_2S\longrightarrow3S+2H_2O$

d)

$NaCl+AgNO_3\longrightarrow AgCl+NaNO_3$

7.

The correct description about redox reaction is

a)

Oxygen is definitely present

b)

The oxidising agent itself carries out oxidation

c)

Oxidation takes place before reduction

d)

Electron transfer definitely takes place

8.

The basis of redox reactions is the

a)

change in oxidation numbers

b)

recombination of atoms in molecules

c)

loss, gain, or bias of electrons

d)

gain or loss of oxygen atom

9.

Bordo mix that is used in agriculture cannot be held in an iron container because iron reacts with the copper (II) sulphate. In the reaction, iron

a)

is an oxidising agent

b)

is a reducing agent

c)

has a decrease in oxidation number

d)

is reduced

10.

The chemical equation for the reaction between sodium hydride and water is

$NaH+H_2O\longrightarrow NaOH+H_2$

Water in the reaction is ...

a)

an oxidising agent

b)

a reducing agent

c)

both an oxidising agent and a reducing agent

d)

neither an oxidisding agent nor a reducing agent

11.

An element in a compound turns into an element in a chemical reaction. The element ...

a)

is definitely oxidised

b)

is definitely reduced

c)

may have been oxidisied or reduced

d)

is neither oxidised nor reduced

Redox Reactions

Total questions: 11

Worksheet time: 6mins

Similar Resources on Wayground