Chemical Reactions And Bonding Test

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Chemical Reactions And Bonding Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following radicals is a polyatomic radical?

A
Chloride ion

B
Dichromate ion

C
Sulphide ion

D
Cupric ion
Question 2
1 / -0

Why is it necessary to balance a chemical equation?

A
So that the number of reactant molecules become equal to the number of product molecules.

B
So that the charges are balanced.

C
Equation remains consistent with the law of conservation of mass.

D
So that the atomic numbers are balanced.
Question 3
1 / -0

What does the delta sign used over an arrow in a chemical equation signify?

A
Reaction is very fast.

B
Reaction is very slow.

C
Reaction is exothermic.

D
Reaction is endothermic.
Question 4
1 / -0

Which of the following is changed while balancing an equation?

A
Molecular formula of the compound

B
Type of reactants

C
Stoichiometric coefficient

D
Type of products

Solution

The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements on the reactants side is equal to that on the products side.
Question 5
1 / -0

2Fe +_ Cl₂ → 2FeCl₃
Which of the following stoichiometric coefficients will precede chlorine to balance the above equation?

A
4

B
3

C
2

D
1
Question 6
1 / -0

Complete the following reaction:
Zn + 2HCl → _______ + H₂

A
2ZnCl

B
2ZnCl₂

C
3ZnCl₂

D
ZnCl₂
Question 7
1 / -0

36 g of water contains _______ of oxygen.

A
4 g

B
16 g

C
30 g

D
32 g
Question 8
1 / -0

When ferrous sulphate is heated, an oxide of iron is obtained. What type of reaction is it?

A
Combination reaction

B
Decomposition reaction

C
Displacement reaction

D
Rearrangement reaction

Solution

It is a decomposition reaction because upon heating, ferrous sulphate decomposes to form ferric oxide (Fe₂O₃), sulphur dioxide (SO₂) and sulphur trioxide (SO₃).
Question 9
1 / -0

When ferrous sulphate is heated, an oxide of iron is obtained. What is the name of the oxide of iron obtained?

A
Ferrous oxide

B
Ferric oxide

C
Iron oxide

D
Ferroferric oxide

Solution

On heating, ferrous sulphate crystals lose water, and anhydrous ferrous sulphate (FeSO₄) is formed. On further heating, anhydrous ferrous sulphate decomposes to form ferric (III) oxide (Fe₂O₃), sulphur dioxide (SO₂) and sulphur trioxide (SO₃).

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Re-Attempt Weekly Quiz Competition

Chemical Reactions And Bonding Test - 2

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Chemical Reactions And Bonding Test - 2

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Question 1

Chloride ion

Dichromate ion

Sulphide ion

Cupric ion

Question 2

So that the number of reactant molecules become equal to the number of product molecules.

So that the charges are balanced.

Equation remains consistent with the law of conservation of mass.

So that the atomic numbers are balanced.

Question 3

Reaction is very fast.

Reaction is very slow.

Reaction is exothermic.

Reaction is endothermic.

Question 4

Molecular formula of the compound

Type of reactants

Stoichiometric coefficient

Type of products

Solution

Question 5

4

3

2

1

Question 6

2ZnCl

2ZnCl2

3ZnCl2

ZnCl2

Question 7

4 g

16 g

30 g

32 g

Question 8

Combination reaction

Decomposition reaction

Displacement reaction

Rearrangement reaction

Solution

Question 9

Ferrous oxide

Ferric oxide

Iron oxide

Ferroferric oxide

Solution

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2ZnCl₂

3ZnCl₂

ZnCl₂