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chemical Equations & Reactions

Total questions: 21

Worksheet time: 11mins

Name
Class
Date
1.

When Lead Nitrate reacts with potassium iodide, Yellow precipitate of ............. is formed

a)

PbI2

b)

KNO3

c)

Pb(NO3)2

d)

PbIO3

2.

Which of the following is not a chemical reaction?

a)

Souring of milk

b)

Dissolution of sugar in water

c)

Rusting of iron

d)

Digestion of food in our body

3.

Which of the following is not a thermal decomposition reaction

a)

2FeSO4 →Fe2O3 +SO2 + SO3

b)

2H2O→2H2 + O2

c)

ZnCO3→ZnO + CO2

d)

2KClO3→2KCl + 3 O2

4.

Combustion is an .................Process

a)

Endothermic

b)

Exothermic

c)

Both (a) and (b)

d)

None of the above

5.

Which of the formula of rust is

a)

Fe2O3

b)

Fe3O4

c)

Fe2O3.nH2O

d)

Fe3O4.nH2O

6.

When dilute hydrochloric acid is added to granulated zinc placed in a test tube , the observation made is

a)

The surface of the metal turns shinning

b)

The reaction mixture turns milky

c)

Greenish yellow gas is evolved

d)

the colorless and odorless gas evolve

7.

Which of the following is an example of displacement reaction?

a)

2 KClO3→KCl + O2

b)

2H2 + O2 →2 H2O

c)

Zn + 2 HCl → ZnCl2 + H2

d)

N2 + 3 H2 → 2 NH3

8.

Burning of magnesium ribbon is a

a)

Chemical reaction

b)

Exothermic reaction

c)

A white color powder forms

d)

All of these

9.
Which of the following is a chemical reaction?
a)
Water freezes.
b)
Sugar dissolves in water.
c)
Salt and pepper are mixed in a dish.
d)
Iron rusts.
10.
When two substances were combined, bubbles were produced and the temperature dropped.  This most likely means that:
a)
a chemical reaction took place
b)
the two substances had low boiling points
c)
one substance dissolved in the other
d)
the two substances are non-reactive
11.
Copper chloride and aluminum react to produce aluminum chloride and copper.  Which of the following is the correctly balanced chemical equation for this reaction?
a)
CuCl2 + Al -> AlCl3 + Cu
b)
3CuCl2 + Al -> AlCl3 + 2Cu
c)
3CuCl2 + 2Al -> 2AlCl3 + 3Cu
d)
CuCl2 + 3Al -> AlCl3 + 2Cu
12.
The first part of a balanced chemical equation is shown:  H2SO4 + 2NaOH → ________.  In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?
a)
2
b)
3
c)
4
d)
5
13.
A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H2The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced?
a)
Na2Cl + H2
b)
 2NaCl + H2
c)
NaCl + 2H2
d)
 2NaCl + 2H2
14.
A balanced chemical equation is one in which:
a)
the number of atoms of each element is the same in both the reactants and the products.
b)
the same compounds are present in both the reactants and the products.
c)
the reactants and the products have equal densities.
d)
 the reactants and the products have equal volumes.
15.
The first part of a balanced chemical equation is shown:  Cu + 2AgNO3 → ________.  In order for this equation to be balanced, how many oxygen (O) atoms must be present in the products?
a)
2
b)
3
c)
5
d)
6
16.

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)

17.

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)

18.

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

19.

What is the formula of magnesium nitride?

a)

MgN3

b)

Mg2N3

c)

Mg3N2

d)

Mg2N

20.

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

21.

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

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