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Question (31)

QN007341

The formula of calcium oxide is:

(A) Ca₂O
(B) CaO
(C) CaO₂
(D) Ca₂O₃

Correct Answer: B

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Question (32)

QN007342

Which of the following has covalent bonding?

(A) NaCl
(B) MgO
(C) H₂
(D) CaCl₂

Correct Answer: C

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Question (33)

QN007343

An atom with valency zero is generally:

(A) Highly reactive
(B) Unstable
(C) Chemically inert
(D) Metallic

Correct Answer: C

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Question (34)

QN007344

The valency of sulfur with electronic configuration 2,8,6 is:

(A) 1
(B) 2
(C) 4
(D) 6

Correct Answer: B

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Question (35)

QN007345

Which ion is formed when sodium loses one electron?

(A) Na⁻
(B) Na²⁺
(C) Na⁺
(D) Na²⁻

Correct Answer: C

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Question (36)

QN007346

The chemical formula of sodium oxide is:

(A) NaO
(B) Na₂O
(C) NaO₂
(D) Na₂O₂

Correct Answer: B

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Question (37)

QN007347

Which atom shares electrons to attain stability?

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

Correct Answer: A

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Question (38)

QN007348

The electronic configuration of chloride ion is:

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

Correct Answer: B

Explanation:

Chlorine gains one electron to attain stable octet.

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Question (39)

QN007349

Which formula correctly represents magnesium oxide?

(A) MgO
(B) Mg₂O
(C) MgO₂
(D) Mg₂O₃

Correct Answer: A

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Question (40)

QN007350

Which statement correctly explains ionic bond formation?

(A) Electrons are shared equally
(B) Electrons are transferred from one atom to another
(C) Protons are exchanged
(D) Neutrons are transferred

Correct Answer: B

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