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Question (1)

QN001081

What is the main characteristic of a chemical change?

(A) Only shape changes
(B) A new substance is formed
(C) Size decreases
(D) State changes only

Correct Answer: B

Explanation:

A chemical change always forms one or more new substances.

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Question (2)

QN001082

When air is blown into lime water, the lime water turns milky because

(A) oxygen reacts with water
(B) bubbles dissolve completely
(C) calcium carbonate is formed
(D) the lime water evaporates

Correct Answer: C

Explanation:

Carbon dioxide reacts with lime water to form calcium carbonate.

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Question (3)

QN001083

Which gas turns lime water milky?

(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Carbon dioxide

Correct Answer: D

Explanation:

Carbon dioxide turns lime water milky.

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Question (4)

QN001084

In the activity with vinegar and baking soda, the bubbling is caused due to the formation of

(A) oxygen gas
(B) hydrogen gas
(C) carbon dioxide gas
(D) nitrogen gas

Correct Answer: C

Explanation:

The reaction releases carbon dioxide gas.

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Question (5)

QN001085

Which of the following is evidence of a chemical change?

(A) Folding paper
(B) Formation of a gas
(C) Breaking chalk
(D) Melting ice

Correct Answer: B

Explanation:

Formation of gas indicates a new substance is formed.

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Question (6)

QN001086

A chemical change always involves

(A) change in shape only
(B) no energy change
(C) formation of one or more new substances
(D) change of state only

Correct Answer: C

Explanation:

Chemical changes produce new substances.

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Question (7)

QN001087

The white substance formed when carbon dioxide reacts with lime water is

(A) calcium oxide
(B) calcium carbonate
(C) sodium carbonate
(D) magnesium carbonate

Correct Answer: B

Explanation:

Calcium carbonate is formed.

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Question (8)

QN001088

Which process below is a chemical change?

(A) Melting butter
(B) Boiling water
(C) Rusting of iron
(D) Folding cloth

Correct Answer: C

Explanation:

Rusting forms a new substance called iron oxide.

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Question (9)

QN001089

Rusting forms a new substance called

(A) iron sulphide
(B) iron carbonate
(C) iron oxide
(D) iron hydroxide

Correct Answer: C

Explanation:

Rust is iron oxide.

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Question (10)

QN001090

Burning magnesium ribbon produces

(A) magnesium chloride
(B) magnesium carbonate
(C) magnesium oxide
(D) magnesium sulphate

Correct Answer: C

Explanation:

Magnesium reacts with oxygen to form magnesium oxide.

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Question (1)

What is the main characteristic of a chemical change?

Explanation:

Link:

Question (2)

When air is blown into lime water, the lime water turns milky because

Explanation:

Link:

Question (3)

Which gas turns lime water milky?

Explanation:

Link:

Question (4)

In the activity with vinegar and baking soda, the bubbling is caused due to the formation of

Explanation:

Link:

Question (5)

Which of the following is evidence of a chemical change?

Explanation:

Link:

Question (6)

A chemical change always involves

Explanation:

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Question (7)

The white substance formed when carbon dioxide reacts with lime water is

Explanation:

Link:

Question (8)

Which process below is a chemical change?

Explanation:

Link:

Question (9)

Rusting forms a new substance called

Explanation:

Link:

Question (10)

Burning magnesium ribbon produces

Explanation:

Link:

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