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Questions

Question (1)

QN007361

The chemical formula of a compound represents:

(A) Colour of compound
(B) Elements present and their ratio
(C) Melting point only
(D) State of matter only

Correct Answer: B

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Question (2)

QN007362

The valency of sodium is:

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

Correct Answer: B

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Question (3)

QN007363

Which formula is correctly written for sodium chloride?

(A) NaCl₂
(B) Na₂Cl
(C) NaCl
(D) Na₂Cl₂

Correct Answer: C

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Question (4)

QN007364

The valency of oxygen is:

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

Correct Answer: B

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Question (5)

QN007365

Which formula is correct for magnesium oxide?

(A) Mg₂O
(B) MgO₂
(C) MgO
(D) Mg₂O₃

Correct Answer: C

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Question (6)

QN007366

The formula of aluminium chloride is:

(A) AlCl
(B) Al₂Cl₃
(C) AlCl₃
(D) Al₃Cl₂

Correct Answer: C

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Question (7)

QN007367

In writing chemical formulae, the total positive and negative charges must be:

(A) Unequal
(B) Zero
(C) Positive only
(D) Negative only

Correct Answer: B

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Question (8)

QN007368

Which ion has valency 2?

(A) Na⁺
(B) Cl⁻
(C) Mg²⁺
(D) K⁺

Correct Answer: C

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Question (9)

QN007369

The formula of calcium chloride is:

(A) CaCl
(B) Ca₂Cl
(C) CaCl₂
(D) Ca₂Cl₂

Correct Answer: C

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Question (10)

QN007370

Which formula is correctly balanced using valencies?

(A) NaO
(B) MgCl
(C) Al₂O₃
(D) Ca₂N

Correct Answer: C

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