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Question (11)

QN007371

The combining capacity of an atom is called:

(A) Atomic mass
(B) Atomic number
(C) Valency
(D) Isotope

Correct Answer: C

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Question (12)

QN007372

Which compound contains polyatomic ion?

(A) NaCl
(B) MgO
(C) CaCO₃
(D) KBr

Correct Answer: C

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Question (13)

QN007373

The valency of carbonate ion (CO₃) is:

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

Correct Answer: B

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Question (14)

QN007374

The formula of sodium carbonate is:

(A) NaCO₃
(B) Na₂CO₃
(C) Na₃CO₂
(D) Na₂CO₂

Correct Answer: B

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Question (15)

QN007375

Which formula is correct for aluminium oxide?

(A) AlO
(B) Al₂O₃
(C) Al₃O₂
(D) AlO₃

Correct Answer: B

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Question (16)

QN007376

The valency of ammonium ion (NH₄⁺) is:

(A) 0
(B) 1
(C) 2
(D) 3

Correct Answer: B

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Question (17)

QN007377

Which compound contains the ammonium ion?

(A) NH₄Cl
(B) NaCl
(C) MgO
(D) CaS

Correct Answer: A

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Question (18)

QN007378

The formula of calcium carbonate is:

(A) CaCO₂
(B) Ca₂CO₃
(C) CaCO₃
(D) Ca₂(CO₃)₂

Correct Answer: C

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Question (19)

QN007379

Which ion is written within brackets in chemical formulae when repeated?

(A) Monoatomic ion
(B) Polyatomic ion
(C) Noble gas
(D) Neutral atom

Correct Answer: B

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Question (20)

QN007380

The formula of ammonium sulfate is:

(A) NH₄SO₄
(B) (NH₄)₂SO₄
(C) NH₄₂SO₄
(D) (NH₄)SO₂

Correct Answer: B

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