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Question (31)

QN0035952

Why do atoms of sodium and chlorine form ions when they combine?

(A) To increase their atomic masses
(B) To attain a stable electronic configuration
(C) To become metals
(D) To produce free electrons

Correct Answer: B

Explanation:

Sodium loses an electron and chlorine gains it, allowing both to attain stable electronic configurations.

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Question (32)

QN0035953

Which force mainly holds the oppositely charged ions together in an ionic compound?

(A) Magnetic force
(B) Electrostatic force of attraction
(C) Gravitational force
(D) Nuclear force

Correct Answer: B

Explanation:

Ionic compounds are held together by strong electrostatic attraction between oppositely charged ions.

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Question (33)

QN0035954

An ionic compound has a high melting point. What is the main reason?

(A) Weak intermolecular forces
(B) Strong electrostatic forces between ions
(C) Presence of free electrons
(D) Low density

Correct Answer: B

Explanation:

Strong electrostatic attraction between ions requires considerable energy to overcome, giving ionic compounds high melting points.

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Question (34)

QN0035955

An ionic compound does not conduct electricity in the solid state but conducts when molten. Why?

(A) Ions are fixed in the solid state but become mobile when molten
(B) Electrons disappear when molten
(C) The compound becomes metallic
(D) The ions become neutral

Correct Answer: A

Explanation:

In solid ionic compounds, ions cannot move freely. In the molten state, ions become mobile and carry electric current.

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Question (35)

QN0035956

A student tests solid sodium chloride and molten sodium chloride for electrical conductivity. Which result is expected?

(A) Both conduct equally well
(B) Only the solid conducts
(C) Only the molten compound conducts
(D) Neither conducts

Correct Answer: C

Explanation:

Molten sodium chloride conducts electricity because its ions are free to move.

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Question (36)

QN0035957

Which property is generally associated with ionic compounds?

(A) Low melting point
(B) High melting point
(C) Electrical conduction in solid state
(D) Malleability

Correct Answer: B

Explanation:

Ionic compounds generally have high melting points because of strong electrostatic attraction between ions.

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Question (37)

QN0035958

A mineral contains a metal compound in sufficient quantity from which the metal can be extracted economically. What is this mineral called?

(A) Alloy
(B) Ore
(C) Slag
(D) Flux

Correct Answer: B

Explanation:

A mineral from which a metal can be extracted profitably is called an ore.

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Question (38)

QN0035959

Which of the following is the main reason ores are concentrated before extraction?

(A) To increase the proportion of unwanted impurities
(B) To remove unwanted materials
(C) To convert metal into an alloy
(D) To reduce the reactivity of the metal

Correct Answer: B

Explanation:

Ore concentration removes unwanted earthy impurities called gangue.

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Question (39)

QN0035960

A metal is found near the bottom of the reactivity series and occurs in a free state in nature. What does this suggest?

(A) It is highly reactive
(B) It reacts rapidly with water
(C) It is comparatively unreactive
(D) It must be extracted by electrolysis

Correct Answer: C

Explanation:

Very unreactive metals such as gold can occur in the free state because they do not readily react with other substances.

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Question (40)

QN0035961

Which method is generally used for extracting metals of low reactivity?

(A) Heating their compounds alone
(B) Electrolysis of molten compounds
(C) Reaction with water
(D) Dissolving them in acids only

Correct Answer: A

Explanation:

Metals of low reactivity can often be obtained by heating their compounds, causing decomposition.

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Question (31)

Why do atoms of sodium and chlorine form ions when they combine?

Explanation:

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Question (32)

Which force mainly holds the oppositely charged ions together in an ionic compound?

Explanation:

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Question (33)

An ionic compound has a high melting point. What is the main reason?

Explanation:

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Question (34)

An ionic compound does not conduct electricity in the solid state but conducts when molten. Why?

Explanation:

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Question (35)

A student tests solid sodium chloride and molten sodium chloride for electrical conductivity. Which result is expected?

Explanation:

Link:

Question (36)

Which property is generally associated with ionic compounds?

Explanation:

Link:

Question (37)

A mineral contains a metal compound in sufficient quantity from which the metal can be extracted economically. What is this mineral called?

Explanation:

Link:

Question (38)

Which of the following is the main reason ores are concentrated before extraction?

Explanation:

Link:

Question (39)

A metal is found near the bottom of the reactivity series and occurs in a free state in nature. What does this suggest?

Explanation:

Link:

Question (40)

Which method is generally used for extracting metals of low reactivity?

Explanation:

Link:

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