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Question (11)

QN007221

A sample of water contains 5 g hydrogen. According to the Law of Constant Proportions, the mass of oxygen present will be:

(A) 20 g
(B) 30 g
(C) 40 g
(D) 45 g

Correct Answer: C

Explanation:

Hydrogen : Oxygen = 1 : 8, so oxygen = 40 g.

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Question (12)

QN007222

Which scientist experimentally showed that copper carbonate always contains copper, carbon and oxygen in fixed proportions?

(A) Proust
(B) Dalton
(C) Bohr
(D) Chadwick

Correct Answer: A

Explanation:

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Question (13)

QN007223

If a compound contains 4 g hydrogen and 32 g oxygen, the compound is most likely:

(A) Water
(B) Hydrogen peroxide
(C) Carbon dioxide
(D) Ammonia

Correct Answer: A

Explanation:

4 : 32 simplifies to 1 : 8.

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Question (14)

QN007224

The Law of Constant Proportions is also known as the:

(A) Law of Multiple Proportions
(B) Law of Definite Proportions
(C) Avogadro Law
(D) Gay-Lussac Law

Correct Answer: B

Explanation:

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Question (15)

QN007225

If 44 g carbon dioxide contains 12 g carbon, the mass of oxygen present is:

(A) 22 g
(B) 24 g
(C) 30 g
(D) 32 g

Correct Answer: D

Explanation:

44 – 12 = 32 g.

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Question (16)

QN007226

Which of the following violates the Law of Constant Proportions?

(A) Water always having H:O = 1:8 by mass
(B) Carbon dioxide always having C:O = 3:8 by mass
(C) Same compound having different elemental ratios by mass
(D) Sodium chloride containing sodium and chlorine in fixed ratio

Correct Answer: C

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Question (17)

QN007227

In ammonia, nitrogen and hydrogen are present in the ratio 14 : 3 by mass. If nitrogen mass is 28 g, hydrogen mass will be:

(A) 3 g
(B) 6 g
(C) 9 g
(D) 12 g

Correct Answer: B

Explanation:

14 : 3 = 28 : 6.

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Question (18)

QN007228

Which law explains why pure water has the same composition everywhere?

(A) Conservation of Energy
(B) Conservation of Mass
(C) Constant Proportions
(D) Reciprocal Proportions

Correct Answer: C

Explanation:

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Question (19)

QN007229

If sulfur dioxide contains sulfur and oxygen in the ratio 1 : 1 by mass, then 16 g sulfur combines with:

(A) 8 g oxygen
(B) 16 g oxygen
(C) 24 g oxygen
(D) 32 g oxygen

Correct Answer: B

Explanation:

Equal mass ratio means 16 g oxygen is required.

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Question (20)

QN007230

A compound contains 27 g aluminium and 24 g oxygen. The ratio of aluminium to oxygen is:

(A) 8 : 9
(B) 9 : 8
(C) 3 : 8
(D) 8 : 3

Correct Answer: B

Explanation:

27 : 24 simplifies to 9 : 8.

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Question (11)

A sample of water contains 5 g hydrogen. According to the Law of Constant Proportions, the mass of oxygen present will be:

Explanation:

Link:

Question (12)

Which scientist experimentally showed that copper carbonate always contains copper, carbon and oxygen in fixed proportions?

Explanation:

Link:

Question (13)

If a compound contains 4 g hydrogen and 32 g oxygen, the compound is most likely:

Explanation:

Link:

Question (14)

The Law of Constant Proportions is also known as the:

Explanation:

Link:

Question (15)

If 44 g carbon dioxide contains 12 g carbon, the mass of oxygen present is:

Explanation:

Link:

Question (16)

Which of the following violates the Law of Constant Proportions?

Explanation:

Link:

Question (17)

In ammonia, nitrogen and hydrogen are present in the ratio 14 : 3 by mass. If nitrogen mass is 28 g, hydrogen mass will be:

Explanation:

Link:

Question (18)

Which law explains why pure water has the same composition everywhere?

Explanation:

Link:

Question (19)

If sulfur dioxide contains sulfur and oxygen in the ratio 1 : 1 by mass, then 16 g sulfur combines with:

Explanation:

Link:

Question (20)

A compound contains 27 g aluminium and 24 g oxygen. The ratio of aluminium to oxygen is:

Explanation:

Link:

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