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Question (31)

QN007391

Which formula correctly represents ammonium hydroxide?

(A) NH₄OH
(B) NH₄(OH)₂
(C) (NH₄)₂OH
(D) NH₄O₂H

Correct Answer: A

Explanation:

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Question (32)

QN007392

The valency of hydroxide ion (OH⁻) is:

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

Correct Answer: B

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Question (33)

QN007393

Which compound contains nitrate ion?

(A) NaNO₃
(B) Na₂SO₄
(C) CaCO₃
(D) KOH

Correct Answer: A

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Question (34)

QN007394

The formula of iron(III) oxide is:

(A) FeO
(B) Fe₂O₃
(C) Fe₃O₂
(D) FeO₂

Correct Answer: B

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Question (35)

QN007395

Which formula is incorrect?

(A) Na₂O
(B) MgCl₂
(C) AlCl₂
(D) CaCO₃

Correct Answer: C

Explanation:

Aluminium valency is 3, so correct formula is AlCl₃.

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Question (36)

QN007396

The formula of potassium sulfate is:

(A) KSO₄
(B) K₂SO₄
(C) K₃SO₄
(D) KSO₃

Correct Answer: B

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Question (37)

QN007397

Which ion carries a 3− charge?

(A) Sulfate
(B) Hydroxide
(C) Phosphate
(D) Nitrate

Correct Answer: C

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Question (38)

QN007398

The formula of sodium hydroxide is:

(A) NaOH
(B) Na₂OH
(C) Na(OH)₂
(D) Na₂O₂H

Correct Answer: A

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Question (39)

QN007399

Which formula represents ammonium carbonate?

(A) NH₄CO₃
(B) (NH₄)₂CO₃
(C) NH₄(CO₃)₂
(D) NH₄₂CO₃₂

Correct Answer: B

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Question (40)

QN007400

Which rule is followed while writing chemical formulae?

(A) Total charge must balance
(B) Positive charges should dominate
(C) Negative ions are written first
(D) Valencies are added directly

Correct Answer: A

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