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Question (1)

QN007211

The Law of Constant Proportions states that:

(A) Mass can neither be created nor destroyed
(B) Elements in a compound are always present in a fixed ratio by mass
(C) Gases occupy equal volumes
(D) Atoms combine in random proportions

Correct Answer: B

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Question (2)

QN007212

The Law of Constant Proportions was proposed by:

(A) Dalton
(B) Lavoisier
(C) Joseph Proust
(D) Rutherford

Correct Answer: C

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Question (3)

QN007213

Water obtained from a river and water obtained from rain contain hydrogen and oxygen in:

(A) Variable proportions
(B) Equal volumes only
(C) Fixed ratio by mass
(D) Random proportions

Correct Answer: C

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Question (4)

QN007214

In water, the ratio of hydrogen to oxygen by mass is:

(A) 1 : 2
(B) 2 : 1
(C) 1 : 8
(D) 8 : 1

Correct Answer: C

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Question (5)

QN007215

If 2 g hydrogen combines completely with 16 g oxygen, the compound formed obeys the Law of Constant Proportions because the ratio is:

(A) 1 : 4
(B) 1 : 8
(C) 2 : 8
(D) 8 : 1

Correct Answer: B

Explanation:

2 : 16 simplifies to 1 : 8.

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Question (6)

QN007216

Which statement correctly defines the Law of Constant Proportions?

(A) Compounds always contain gases
(B) Matter is indestructible
(C) A compound always contains the same elements combined in a fixed ratio by mass
(D) Atoms combine only in equal numbers

Correct Answer: C

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Question (7)

QN007217

If 9 g water contains 1 g hydrogen, the mass of oxygen present is:

(A) 7 g
(B) 8 g
(C) 9 g
(D) 10 g

Correct Answer: B

Explanation:

9 – 1 = 8 g.

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Question (8)

QN007218

Which of the following supports the Law of Constant Proportions?

(A) Water from all sources has the same composition by mass
(B) Different compounds have same colour
(C) Gases have no mass
(D) Metals melt at fixed temperatures only

Correct Answer: A

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Question (9)

QN007219

In carbon dioxide, carbon and oxygen are present in the mass ratio:

(A) 1 : 2
(B) 3 : 8
(C) 8 : 3
(D) 2 : 1

Correct Answer: B

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Question (10)

QN007220

If 12 g carbon combines with 32 g oxygen to form carbon dioxide, the ratio of carbon to oxygen is:

(A) 12 : 32
(B) 3 : 8
(C) 8 : 3
(D) 1 : 8

Correct Answer: B

Explanation:

12 : 32 simplifies to 3 : 8.

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Question (1)

The Law of Constant Proportions states that:

Explanation:

Link:

Question (2)

The Law of Constant Proportions was proposed by:

Explanation:

Link:

Question (3)

Water obtained from a river and water obtained from rain contain hydrogen and oxygen in:

Explanation:

Link:

Question (4)

In water, the ratio of hydrogen to oxygen by mass is:

Explanation:

Link:

Question (5)

If 2 g hydrogen combines completely with 16 g oxygen, the compound formed obeys the Law of Constant Proportions because the ratio is:

Explanation:

Link:

Question (6)

Which statement correctly defines the Law of Constant Proportions?

Explanation:

Link:

Question (7)

If 9 g water contains 1 g hydrogen, the mass of oxygen present is:

Explanation:

Link:

Question (8)

Which of the following supports the Law of Constant Proportions?

Explanation:

Link:

Question (9)

In carbon dioxide, carbon and oxygen are present in the mass ratio:

Explanation:

Link:

Question (10)

If 12 g carbon combines with 32 g oxygen to form carbon dioxide, the ratio of carbon to oxygen is:

Explanation:

Link:

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