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Question (21)

QN007331

Which ion is formed when oxygen gains electrons?

(A) O⁺
(B) O²⁺
(C) O²⁻
(D) O⁻

Correct Answer: C

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Question (22)

QN007332

A magnesium atom becomes stable after:

(A) Gaining one electron
(B) Gaining two electrons
(C) Losing two electrons
(D) Sharing eight electrons

Correct Answer: C

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Question (23)

QN007333

Which electronic configuration represents a stable noble gas?

(A) 2,7
(B) 2,8,1
(C) 2,8
(D) 2,6

Correct Answer: C

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Question (24)

QN007334

The formula of magnesium chloride is:

(A) MgCl
(B) Mg₂Cl
(C) MgCl₂
(D) Mg₂Cl₂

Correct Answer: C

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Question (25)

QN007335

The valency of nitrogen with electronic configuration 2,5 is:

(A) 1
(B) 2
(C) 3
(D) 5

Correct Answer: C

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Question (26)

QN007336

Which pair forms an ionic compound?

(A) Hydrogen and hydrogen
(B) Sodium and chlorine
(C) Oxygen and oxygen
(D) Nitrogen and hydrogen

Correct Answer: B

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Question (27)

QN007337

The formula of aluminium oxide is:

(A) AlO
(B) Al₂O₃
(C) AlO₂
(D) Al₃O₂

Correct Answer: B

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Question (28)

QN007338

The number of electrons shared in a hydrogen molecule is:

(A) 1
(B) 2
(C) 3
(D) 4

Correct Answer: B

Explanation:

One electron from each hydrogen atom is shared.

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Question (29)

QN007339

Which element has valency 1?

(A) Oxygen
(B) Nitrogen
(C) Sodium
(D) Carbon

Correct Answer: C

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Question (30)

QN007340

Carbon has electronic configuration 2,4. Its valency is:

(A) 2
(B) 3
(C) 4
(D) 6

Correct Answer: C

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