Chemical Reactions And Bonding Test

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Chemical Reactions And Bonding Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

How many molecules of sodium hydroxide will react with one molecule of copper sulphate to produce one molecule of copper hydroxide and one molecule of sodium sulphate?

A
1

B
2

C
3

D
4

Solution

2 molecules of sodium hydroxide will react with one molecule of copper sulphate to produce one molecule of copper hydroxide and one molecule of sodium sulphate.
Question 2
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Mercuric oxide is unstable at higher temperatures and breaks down to produce mercury and oxygen as depicted below:

2HgO(s) 2Hg(l) + O₂(g)

The reaction may be classified as:

A
Combination reaction

B
Displacement reaction

C
Rearrangement reaction

D
Decomposition reaction

Solution

This an example of thermal decomposition reaction as the reactant decomposes on supplying heat energy.
Question 3
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Which of the following decomposition reactions takes place in our body?

A
C₆H₁₂O₆ + O₂ CO₂ + H₂O

B
2Al₂O₃ 4Al + 3O₂

C
2Pb (NO₃)₂ 2PbO + 4NO₂ + O₂

D
2H₂O 2H₂ + O₂
Question 4
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Which of the following reactions is a double displacement reaction?

A
Mg + CuSO₄ MgSO₄ + Cu

B
BaCl₂ + CuSO₄ BaSO₄ + CuCl₂

C
2KBr + Cl₂ 2KCl + Br₂

D
NH₄O₂ N₂ + 2H₂O
Question 5
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Consider the reaction
A²⁺ + B B²⁺ + A
Which of the following particles acts as an oxidizing agent?

A
A²⁺

B
B

C
B⁺

D
A
Question 6
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Which of the following processes cannot be defined as a reduction process?

A
Gain of electrons

B
Gain of hydrogen

C
Loss of oxygen

D
Sharing of electrons
Question 7
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Ravi wants to synthesize sulphuric acid from sulphur and oxygen in the presence of water.The reaction would be called as _______.

A
decomposition reaction

B
combination reaction

C
precipitation reaction

D
neutralization reaction
Question 8
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Which of the following substances acts as a reducing agent?

A
Chlorine

B
Oxygen

C
Sodium

D
Bromine
Question 9
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Which of the following conditions are required during Haber`s process while preparing ammonia?

A
High temperature and low pressure.

B
High pressure and low temperature.

C
Low pressure and low temperature.

D
High pressure and high temperature.
Question 10
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Pb₃O₄ + 2C 3Pb + 2CO₂
What is the above reaction known as?

A
Oxidation reaction

B
Reduction reaction

C
Double displacement reaction

D
Redox reaction

Solution

This reaction is redox reaction because both oxidation and reduction is occur.
Question 11
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When acidity is produced in our stomach, we take antacid which gives relief. Identify the type of reaction in this case.

A
Redox reaction

B
Neutralization reaction

C
Photochemical reaction

D
Reversible reaction
Question 12
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Which of the following categories will you place the reaction involving the rusting of iron?

A
Neutralization reaction

B
Oxidation reaction

C
Decomposition reaction

D
Displacement reaction
Question 13
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What is released when copper oxide is heated with carbon monoxide?

A
Copper and carbon

B
Copper and carbon dioxide

C
Copper oxide and carbon

D
Copper oxide and carbon dioxide
Question 14
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What happens in thermal decomposition?

A
Complex chemical compound breaks into simpler compounds and reunites.

B
Complex chemical compound breaks into simpler components and do not reunite.

C
No breaking of compound occurs.

D
Smaller chemical compounds combine to form a complex chemical compound.
Question 15
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When a strip of iron metal is placed in copper sulphate solution, a coating of copper on the iron strip is formed. This is because ____.

A
of addition reaction between iron metal and copper sulphate solution

B
iron displaces copper from copper sulphate solution as in a displacement reaction

C
iron displaces copper from copper sulphate solution as in a double displacement reaction

D
iron is not displaced but copper gets deposited on iron
Question 16
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Complete the given reaction by choosing the correct option.

KOH + HNO₃ _______ + H₂O

A
KNO₃

B
KNO₂

C
K (OH)₂

D
K₂O

Solution

KOH + HNO₃ KNO₃ + H₂O

So, the correct option is 1.
Question 17
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Complete the given reaction by choosing the correct option.

H₂S + Cl₂ _______ + 2HCl

A
SO₂

B
SO₃

C
S

D
H₂

Solution

H₂S + Cl₂ S + 2HCl
In this reaction, hydrogen sulphide is oxidised to sulphur and Cl₂ is reduced to HCl due to addition of a hydrogen atom.

So, the correct option is 3.
Question 18
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Those reactions which proceed in both the directions and result in the formation of a mixture of reactants and products are called ______.

A
irreversible reactions

B
reversible reactions

C
decomposition reaction

D
neutralization reaction

Solution

A reversible reaction is a reaction where the reactants form products, which react together to give the reactants back.
So, the correct option is 2.
Question 19
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Which of the following statements is true for CuO + H₂ Cu + H₂O?

A
Copper oxide is reduced.

B
Water is oxidized.

C
Hydrogen is reduced.

D
Copper is reduced.
Question 20
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2H₂O₂ 2H₂O + O₂
The above equation shows the formation of water and oxygen from hydrogen peroxide. Into which of the following categories would you place the above reaction?

A
Combination

B
Decomposition

C
Displacement

D
Double displacement

Solution

A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more elements or new compounds.