Chemical Reactions and Equations Test

Result

Chemical Reactions and Equations Test - 21

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

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

A
1:1

B
2:1

C
4:1

D
1:2

Solution

In 1 mole water molecule, there are 2 mole hydrogen and 1 mole oxygen
Question 2
1 / -0

Which of the following is(are) an endothermic process(es)?

(i) Dilution of sulphuric acid

(ii) Sublimation of dry ice

(iii) Condensation of water vapours

(iv) Evaporation of water

A
(i) and (iii)

B
(ii) only

C
(iii) only

D
(ii) and (iv)

Solution

When a solid change into gas or a liquid change into gas, it happens because of absorption of heat. Hence, these are endothermic processes.
Question 3
1 / -0

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

A
Lead sulphate (insoluble)

B
Lead acetate

C
Ammonium nitrate

D
Potassium sulphate

Solution

We need a source of lead for making lead iodide, hence options (c) and (d) are ruled out. Lead sulphate is insoluble, so it cannot be used.
Question 4
1 / -0

Which of the following gases can be used for storage of fresh sample of an oil for a long time?

A
Carbon dioxide or oxygen

B
Nitrogen or oxygen

C
Carbon dioxide or helium

D
Helium or nitrogen

Solution

Oxygen is an oxidizing agent and hence it cannot be used. Helium is an inert gas and hence it can be used. Nitrogen is among the least reactive gases and it is much cheaper than helium. Hence, in most of the cases, Nitrogen is used in packets of oily food to prevent rancidity.
Question 5
1 / -0

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

\(2KCIO_3(s) \overset{Heat}{\underset {Catalyst}{\longrightarrow}} 2KCI(s)+3O_2(g)\)

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

A
It is a decomposition reaction and endothermic in nature

B
It is a combination reaction

C
It is a decomposition reaction and accompanied by release of heat

D
It is a photochemical decomposition reaction and exothermic in nature

Solution

Potassium chlorate decomposes to give Potassium chloride and oxygen; hence it is a decomposition reaction. Heat is being supplied to this reaction, so it is an endothermic reaction.
Question 6
1 / -0

Which one of the following processes involve chemical reactions?

A
Storing of oxygen gas under pressure in a gas cylinder

B
Liquefaction of air

C
Keeping petrol in a china dish in the open

D
Heating copper wire in presence of air at high temperature

Solution

When copper is heated at high temperature in presence of air, it undergoes oxidation to form copper oxide.(black in colour).

\(2Cu+O_2 \rightarrow 2CuO\)
Question 7
1 / -0

In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

A
\(2H_2(l)+O_2(l) \rightarrow 2H_2O(g)\)

B
\(2H_2(g)+O_2(l) \rightarrow 2H_2O(l)\)

C
\(2H_2(g)+O_2(g) \rightarrow 2H_2O(l)\)

D
\(2H_2(g)+O_2(g) \rightarrow 2H_2O(g)\)

Solution

At room temperature, hydrogen and oxygen are available as gas, while water is available as liquid.
Question 8
1 / -0

Which of the following are combination reactions?

(i) \(2KClO_3 \overset{Heat}{\longrightarrow} 2KCl+3O_2\)

(ii) \(MgO+H_2O\rightarrow Mg(OH)_2\)

(iii) \(4Al+3O_2\rightarrow 2Al_2O_3\)

(iv) \(Zn+FeSO_4 \rightarrow ZnSO_4+Fe\)

A
(i) and (iii)

B
(iii) and (iv)

C
(ii) and (iv)

D
(ii) and (iii)

Solution

In these reactions, two reactants react to form a single product.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Chemical Reactions and Equations Test - 21

Result

Chemical Reactions and Equations Test - 21

Score

-

Rank

-

SHARING IS CARING

Question 1

1:1

2:1

4:1

1:2

Solution

Question 2

(i) and (iii)

(ii) only

(iii) only

(ii) and (iv)

Solution

Question 3

Lead sulphate (insoluble)

Lead acetate

Ammonium nitrate

Potassium sulphate

Solution

Question 4

Carbon dioxide or oxygen

Nitrogen or oxygen

Carbon dioxide or helium

Helium or nitrogen

Solution

Question 5

It is a decomposition reaction and endothermic in nature

It is a combination reaction

It is a decomposition reaction and accompanied by release of heat

It is a photochemical decomposition reaction and exothermic in nature

Solution

Question 6

Storing of oxygen gas under pressure in a gas cylinder

Liquefaction of air

Keeping petrol in a china dish in the open

Heating copper wire in presence of air at high temperature

Solution

Question 7

\(2H_2(l)+O_2(l) \rightarrow 2H_2O(g)\)

\(2H_2(g)+O_2(l) \rightarrow 2H_2O(l)\)

\(2H_2(g)+O_2(g) \rightarrow 2H_2O(l)\)

\(2H_2(g)+O_2(g) \rightarrow 2H_2O(g)\)

Solution

Question 8

(i) and (iii)

(iii) and (iv)

(ii) and (iv)

(ii) and (iii)

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.