Free Printable Chemical Reactions And Equations

1.

Magnesium ribbon is rubbed before burning because it has a coating of

a)

basic magnesium carbonate

b)

basic magnesium oxide

c)

basic magnesium sulphide

d)

basic magnesium chloride

2.

Oxidation is a process which involves

a)

addition of oxygen

b)

addition of hydrogen

c)

removal of oxygen

d)

removal of hydrogen

3.

The process of reduction involves

a)

addition of oxygen

b)

addition of hydrogen

c)

removal of oxygen

d)

removal of hydrogen

4.

Give the ratio in which hydrogen and oxygen are present in water by volume.

a)

2:1

b)

1:1

c)

1:2

d)

1:8

5.

MnO2 + 4HCl → 2 + 2H2O + Cl2

Identify the substance oxidized in the above . equation.

a)

$MnCl_2$

b)

$HCL$

c)

$H_2O$

d)

$MnO_2$

6.

A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.

a)

$CaOCL_2$

b)

$Ca\left(OH\right)_2$

c)

$CaO$

d)

$CaCO_3$

7.

When Ag is exposed to air it gets a black coating of

a)

$AgNO_3$

b)

$Ag_2S$

c)

$Ag_2O$

d)

$Ag_2CO_3$

8.

Which of the following is an endothermic process?

a)

Dilution of sulphuric acid

b)

Sublimation of dry ice

c)

Condensation of water vapours

d)

Respiration in human beings

9.

What type of chemical reactions take place when electricity is passed through water?

a)

Displacement

b)

Combination

c)

Decomposition

d)

Double displacement

10.

Which of the following is a displacement reaction?

a)

$MgCO_{3\ }---\rightarrow MgO+Co_2$

b)

$2Na+2H_2O---\rightarrow2NaOH+H_2$

c)

$2H_2+O_2---\rightarrow2H_2O$

d)

$2Pb\left(NO_3\right)_2\ \ \ --\ \left(heat\right)\rightarrow2PbO+4NO_2+O_2$

Chemical Reactions And Equations

Total questions: 10

Worksheet time: 6mins

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