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Question (11)

QN0035932

Magnesium ribbon is burned in air. Which product is mainly formed?

(A) Magnesium chloride
(B) Magnesium oxide
(C) Magnesium sulphide
(D) Magnesium carbonate

Correct Answer: B

Explanation:

Magnesium burns in oxygen to form magnesium oxide.

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Question (12)

QN0035933

Why is magnesium ribbon cleaned before burning?

(A) To remove the oxide layer
(B) To increase its mass
(C) To convert it into a non-metal
(D) To make it soluble in water

Correct Answer: A

Explanation:

Magnesium develops a thin layer of magnesium oxide on its surface, so the ribbon is cleaned before burning.

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Question (13)

QN0035934

Which metal reacts with cold water very slowly but reacts more readily with steam?

(A) Iron
(B) Sodium
(C) Potassium
(D) Calcium

Correct Answer: A

Explanation:

Iron does not react with cold water but reacts with steam to form iron oxide and hydrogen.

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Question (14)

QN0035935

Which pair of metals reacts vigorously with cold water?

(A) Copper and silver
(B) Sodium and potassium
(C) Iron and copper
(D) Zinc and aluminium

Correct Answer: B

Explanation:

Sodium and potassium react violently with cold water and produce hydrogen gas.

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Question (15)

QN0035936

Which of the following metals does not react with water under ordinary conditions?

(A) Sodium
(B) Calcium
(C) Magnesium
(D) Copper

Correct Answer: D

Explanation:

Copper does not react with water under ordinary conditions.

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Question (16)

QN0035937

A metal X reacts with cold water and produces hydrogen gas. Which observation would support that X is highly reactive?

(A) Reaction is very slow
(B) No heat is produced
(C) Reaction is vigorous and heat is released
(D) No gas is formed

Correct Answer: C

Explanation:

Highly reactive metals such as sodium and potassium react vigorously with water and release heat.

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Question (17)

QN0035938

A metal reacts with dilute hydrochloric acid and produces hydrogen gas. Which equation represents the general reaction?

(A) Metal + acid → salt + hydrogen
(B) Metal + acid → oxide + water
(C) Metal + water → salt + oxygen
(D) Metal + oxygen → acid + hydrogen

Correct Answer: A

Explanation:

Reactive metals react with dilute acids to form the corresponding salt and hydrogen gas.

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Question (18)

QN0035939

Zinc reacts with dilute hydrochloric acid. Which gas is released?

(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Chlorine

Correct Answer: C

Explanation:

Zinc reacts with dilute hydrochloric acid to produce zinc chloride and hydrogen gas.

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Question (19)

QN0035940

A student adds equal amounts of dilute hydrochloric acid to zinc and copper separately. Hydrogen is observed only with zinc. What does this indicate?

(A) Copper is more reactive than zinc
(B) Zinc is more reactive than copper
(C) Both have equal reactivity
(D) Copper is a non-metal

Correct Answer: B

Explanation:

Zinc reacts with dilute acid and releases hydrogen, whereas copper does not, showing that zinc is more reactive than copper.

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Question (20)

QN0035941

Which metal can displace copper from copper sulphate solution?

(A) Silver
(B) Gold
(C) Zinc
(D) Platinum

Correct Answer: C

Explanation:

Zinc is more reactive than copper and can displace it from copper sulphate solution.

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Question (11)

Magnesium ribbon is burned in air. Which product is mainly formed?

Explanation:

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Question (12)

Why is magnesium ribbon cleaned before burning?

Explanation:

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Question (13)

Which metal reacts with cold water very slowly but reacts more readily with steam?

Explanation:

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Question (14)

Which pair of metals reacts vigorously with cold water?

Explanation:

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Question (15)

Which of the following metals does not react with water under ordinary conditions?

Explanation:

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Question (16)

A metal X reacts with cold water and produces hydrogen gas. Which observation would support that X is highly reactive?

Explanation:

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Question (17)

A metal reacts with dilute hydrochloric acid and produces hydrogen gas. Which equation represents the general reaction?

Explanation:

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Question (18)

Zinc reacts with dilute hydrochloric acid. Which gas is released?

Explanation:

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Question (19)

A student adds equal amounts of dilute hydrochloric acid to zinc and copper separately. Hydrogen is observed only with zinc. What does this indicate?

Explanation:

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Question (20)

Which metal can displace copper from copper sulphate solution?

Explanation:

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