Free Printable Chemical Reactions and Equations

1.

Oxidation is the loss of electrons from a substance.

a)

True

b)

False

2.

Reactions in which energy is absorbed are known as (a) reactions.

3.

Balance the following chemical equation:

___NaBr + ___Cl2 ----> ____NaCl + ___Br2

Enter the values serially

(a)

4.

What is the molecular formula for barium chloride?

a)

BaCl2

b)

BaCl

c)

Ba2Cl

d)

BaCl3

5.

Both CO2 and H2 gases are

a)

heavier than air

b)

colourless

c)

acidic in nature

d)

soluble in water

6.

Chemically rust is

a)

hydrated ferrous oxide

b)

only ferric oxide

c)

hydrated ferric oxide

d)

none of these

7.

Which information is not conveyed by a balanced chemical equation?

a)

Physical states of reactants and products

b)

Symbols and formulae of all the substances involved in a particular reaction

c)

Number of atoms/molecules of the reactants and products formed

d)

Whether a particular reaction is actually feasible or not

8.

Oxidation is a process which involves-

a)

addition of oxygen or removal of hydrogen

b)

addition of hydrogen or removal of oxygen

c)

Only removal of oxygen

d)

Only removal of hydrogen

9.

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)

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

10.

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

a)

Displacement

b)

Combination

c)

Decomposition

d)

Double displacement

11.

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

12.

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

a)

$AgNO_3$

b)

$Ag_2S$

c)

$Ag_2O$

d)

$Ag_2CO_3$

13.

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)

$CaCO_3$

14.

MnO2 + 4HCl → 2 + 2H2O + Cl2

Identify the substance oxidized in the above . equation.

a)

$MnCl_2$

b)

$HCL$

c)

$H_2O$

d)

$MnO_2$

15.

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

16.

The process of reduction involves

a)

addition of oxygen

b)

addition of hydrogen

c)

removal of oxygen

d)

removal of hydrogen

17.

Oxidation is a process which involves

a)

addition of oxygen

b)

addition of hydrogen

c)

removal of oxygen

d)

removal of hydrogen

18.

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

19.

2Cu +O2 =2 CuO when heated.

Name the reaction

a)

Reduction

b)

Oxidation

c)

Redox reaction

d)

Exothermic

20.

When CaCO2 is heated the products are

a)

CaO + CO2

b)

CaOH2

c)

Ca+ H2O

21.

Balance

BaCl2 +H2SO4 = BaSO4 +HCl

4 lines

22.

Why does Silver chloride turn grey in sunlight ?

a)

Due to corrosion

b)

Due to the formation Ag and Cl

c)

Due to the formation of silver hydroxide

23.

Write balanced chemical reaction-

Sodium+ water = Sodium hydroxide + Hydrogen

4 lines

24.

Name the product formed when CaO reacts with water

a)

Calcium hydroxide

b)

CO2 + Ca

c)

Ca+ H2O

25.

2 PbO + C = 2 Pb+ CO2

a)

Redox reaction

b)

Decomposition reaction

c)

Oxidation reaction

d)

Displacement reaction

26.

Neutralisation reaction between an acid and base is a type of----

a)

Displacement reaction

b)

Double displacement reaction

c)

Addition reaction

d)

Decomposition reaction

27.

The respiration process in which glucose reacts with oxygen to produce energy is

a)

Exothermic reaction

b)

Endothermic reaction

c)

Reversible reaction

d)

Combination reaction

28.

In a chemical reaction between sulphuric acid and barium chloride solution, the white precipitate formed is ----

a)

HCl

b)

Chlorine

c)

Sulphur

d)

Barium sulphate

29.

Which of the following is endothermic reaction?

a)

Dissolution of ammonium chloride in water

b)

Dilution of sulphuric acid

c)

Dissolution of sodium hydroxide in water

d)

Reaction of zinc with HCl

30.

Reaction of Na and H₂O gives a very strong base , NaOH and another product, a gas. How do you test for this gas ?

a)

Pass it through lime water, turns milky.

b)

Rotten egg smell

c)

Burns with a dazzling flame

d)

Burns with a pop sound

31.

Which of the following is not a type of reduction

a)

Gain of hydrogen

b)

loss of electron

c)

loss of oxygen

d)

gain of electron

32.

A powdered salt X was heated in a dry test tube and evolution of brown fumes of nitrogen dioxide and a yellow residue of lead oxide is formed. The salt X is :

a)

Magnesium Carbonate

b)

Lead nitrate

c)

Ammonium Sulphate

d)

Calcium carbonate

33.

When ethane reacts with oxygen present in air it produces CO₂ and water. In this reaction how many moles of oxygen is used?

a)

3

b)

5/2

c)

2

d)

7/2

34.

When dil. sulphuric acid is added to pieces of iron sulphie, hydrogen sulphide gas is produced and soluble ferrous sulphate is produced. The type of chemical reaction involved is :

a)

Decomposition reaction

b)

Combination reaction

c)

Displacement Reaction

d)

Double displacement reaction

35.

A metal 'M' reacts with an acid according to the equation :

M + H⁺ --------> M³⁺+ H₂

_{The metal can be}

a)

Potassium

b)

Magnesium

c)

Aluminium

d)

Barium

36.

What are the products of decomposition of PbCO₃

a)

PbO + CO₂

b)

Pb + CO₂ + O₂

c)

PbO + C

d)

Pb + C + O₂

37.

What is the formula of magnesium nitride?

a)

MgN₃

b)

Mg₂N₃

c)

Mg₃N₂

d)

Mg₂N

38.

Which of the following processes involve chemical reactions

a)

Storing of oxygen gas under pressure in a gas cylinder

b)

Liquification of air

c)

Keeping petrol in a china dish in open

d)

Heating copper wire in the presence of air at high temperature

39.

The electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water

a)

1:1

b)

2:1

c)

4:1

d)

1:2

40.

The following is an example of :

4NH₃ + 5O₂ -----> 4NO + 6H₂O

(i) displacement reaction

(ii) combustion reaction

(iii) redox reaction

(iv) neutralization reaction

a)

(i) and (iv)

b)

(ii) and (iii)

c)

(i) and (ii)

d)

(iii) and (iv)

Chemical Reactions and Equations

Total questions: 40

Worksheet time: 20mins

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