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chemical equations and reaction

Total questions: 20

Worksheet time: 11mins

Name
Class
Date
1.
The following reaction is an example of a 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)(i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction
a)
(i) and (iv)
b)
(ii) and (iii)
c)
(i) and (iii)
d)
(iii) and (iv)
2.
Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid(iii) Evaporation of water (iv) Sublimation of camphor (crystals)
a)
(i) and (ii)
b)
(ii) and (iii)
c)
(i) and (iv)
d)
(iii) and (iv)
3.
Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride(iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride
a)
(a) (i) only
b)
(i) and (iii)
c)
(c) (ii) and (iii)
d)
(d) (iv) only
4.
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?(i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction
a)
(a) (i) only
b)
(b) (ii) only
c)
(c) (iv) only
d)
(d) (ii) and (iv)
5.
Which one of the following processes involve chemical reactions?
a)
Storing of oxygen gas under pressure in a gas cylinder
b)
(b) Liquefaction of air
c)
(c) Keeping petrol in a china dish in the open
d)
(d) Heating copper wire in presence of air at high temperature
6.

Rancidity is a process in which fat/oils smell due to the change process of

a)

oxidation

b)

reduction

c)

displacement

d)

neutralization

7.

Colour of which metal changes to greem due to corrosion?

a)

Cu

b)

Al

c)

Fe

d)

Ag

8.

Which of the following statements about the given reaction are correct?

3Fe(s) + 4H2O(g) ® Fe3O4(s) + 4H2(g)

(i) Iron metal is getting oxidised

(ii) Water is getting reduced

(iii) Water is acting as reducing agent

(iv) Water is acting as oxidising agent

a)

(a) (i), (ii) and (iii)

b)

(b) (iii) and (iv)

c)

(c) (i), (ii) and (iv)

d)

(d) (ii) and (iv)

9.

Which among the following is(are) double displacement

reaction(s)?

(i) Pb + CuCl2 --> PbCl2 + Cu

(ii) Na2SO4 + BaCl2 --> BaSO4 + 2NaCl

(iii) C + O2 --> CO2

(iv) CH4 + 2O2 --> CO2 + 2H2O

a)

(a) (i) and (iv)

b)

(b) (ii) only

c)

(c) (i) and (ii)

d)

(d) (iii) and (iv)

10.

The following reaction is used for the preparation of oxygen gas in the laboratory

2KClO3 (s) + Heat --Catalyst--> 2KCl (s) + 3O2 (g)

Which of the following statement(s) is(are) correct about the reaction?

a)

(a) It is a decomposition reaction and endothermic in nature

b)

(b) It is a combination reaction

c)

(c) It is a decomposition reaction and accompanied by release of heat

d)

(d) It is a photochemical decomposition reaction and exothermic in nature

11.

Which of the following are combination reactions?

(i) 2KClO3 + Heat --> 2KCl + 3O2

(ii) MgO + H2O --> Mg(OH)2

(iii) 4Al + 3O2 --> 2Al2O3

(iv) Zn + FeSO4 --> ZnSO4 + Fe

a)

(a) (i) and (iii)

b)

(b) (iii) and (iv)

c)

(c) (ii) and (iv)

d)

(d) (ii) and (iii)

12.
Before a chemical reaction, the total mass of two reactants is measured to be 40 grams.  After the reaction, what should be the total mass of the products?
a)
0 grams
b)
20 grams
c)
40 grams
d)
80 grams
13.
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
14.
Which observation would most likely indicate that an exothermic reaction has occurred?
a)
a color change
b)
the production of gas bubbles
c)
an increase in temperature
d)
a decrease in temperature
15.
Suppose two substances were combined together in a beaker. You know that a chemical reaction occurred if:
a)
new substances were created.
b)
one substance dissolved in the other.
c)
one substance melted in the other.
d)
 the two substances remained separate.
16.
 The idea that matter is neither created nor destroyed in chemical reactions is known as the:
a)
 The idea that matter is neither created nor destroyed in chemical reactions is known as the:
b)
law of conservation of energy.
c)
 law of conservation of mass.
d)
second law of thermodynamics.
17.

FeSO4----------> fe2O3+SO2+SO3 in which type you will classify this reaction

a)

Displacement

b)

Decomposition

c)

Combination

18.

Which of the following is combination reaction?

a)

A+B--------> AB

b)

A+B-----> AC

c)

Ab-------->c

19.

What is the main work of antioxidants?

a)

To prevent rusting of iron

b)

To prevent food from spoiling

c)

Prevent gold from black coating

20.

The products of a reaction have the same ________as the reactants.

a)

molecule

b)

atoms

c)

subscripts

d)

coefficients

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