Physical And Chemical Changes Test

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Physical And Chemical Changes Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Analyse the two statements given below and select the correct option.

Statement I: Both physical and chemical changes may be accompanied by a change in state.
Statement II: Boiling of water is a chemical change because a gaseous product is formed.

A
Both statements I and II are correct and statement II is the correct reason for I.

B
Both statements I and II are correct, but statement II is not the correct reason for I.

C
Statement I is correct, but statement II is incorrect.

D
Both statements I and II are incorrect.

Solution

Statement I is correct, but statement II is incorrect because boiling of water is a physical change as no new substance is formed. Only the physical state of the substance changes during boiling.
Question 2
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While balancing an equation, which of the following is changed?

A
Molecular formula of the compound

B
Type of reactants

C
Stoichiometric coefficient

D
Type of products

Solution

Only the stoichiometric coefficients are changed while balancing a chemical equation.
There is no change in the reactants and the products or their formulae.
Question 3
1 / -0

Identify the type of the given reaction:

C₂H₆ + 5O₂ → 3H₂O + 2CO₂

A
Combination

B
Decomposition

C
Double replacement

D
Combustion

Solution

Combustion is a process in which a substance reacts with excess of oxygen and the reaction proceeds with the release of energy in the form of heat and light.

During the combustion of hydrocarbons (compounds of carbon and hydrogen), the products invariably are carbon dioxide and water, along with the release of energy.

The given reaction is a combustion reaction.
Question 4
1 / -0

What will be the respective coefficients in the given chemical equation?

?Mg + ?HCl → 1MgCl₂ + ?H₂

A
1, 2, 1

B
2, 1, 1

C
2, 2, 2

D
1, 1, 2

Solution

The balanced chemical equation is as follows:

Mg + 2HCl → MgCl₂ + H₂
Question 5
1 / -0

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

Solution

A reaction that proceeds with the exchange of ions between the reactant species is called a double displacement reaction.

BaCl₂ + CuSO₄ → BaSO₄ + CuCl₂

This is an example of a double displacement reaction.

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Physical And Chemical Changes Test - 1

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Physical And Chemical Changes Test - 1

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Question 1

Both statements I and II are correct and statement II is the correct reason for I.

Both statements I and II are correct, but statement II is not the correct reason for I.

Statement I is correct, but statement II is incorrect.

Both statements I and II are incorrect.

Solution

Question 2

Molecular formula of the compound

Type of reactants

Stoichiometric coefficient

Type of products

Solution

Question 3

Combination

Decomposition

Double replacement

Combustion

Solution

Question 4

1, 2, 1

2, 1, 1

2, 2, 2

1, 1, 2

Solution

Question 5

Mg + CuSO4 → MgSO4 + Cu

BaCl2 + CuSO4 → BaSO4 + CuCl2

2KBr + Cl2 → 2KCl + Br2

NH4O2 → N2 + 2H2O

Solution

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Mg + CuSO₄ → MgSO₄ + Cu

BaCl₂ + CuSO₄ → BaSO₄ + CuCl₂

2KBr + Cl₂ → 2KCl + Br₂

NH₄O₂ → N₂ + 2H₂O