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Question (41)

QN007251

If 32 g oxygen combines with hydrogen according to the Law of Constant Proportions, hydrogen required is:

(A) 2 g
(B) 4 g
(C) 8 g
(D) 16 g

Correct Answer: B

Explanation:

Hydrogen : Oxygen = 1 : 8, so hydrogen = 4 g.

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Question (42)

QN007252

A compound formed using 10 g calcium and 14 g sulfur always contains these elements in the same ratio. This illustrates:

(A) Law of Multiple Proportions
(B) Law of Conservation of Mass
(C) Law of Constant Proportions
(D) Gay-Lussac Law

Correct Answer: C

Explanation:

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Question (43)

QN007253

Which micro-component encourages deeper thinking about compounds and composition?

(A) At a Glance
(B) Pause and Ponder
(C) Index
(D) Glossary

Correct Answer: B

Explanation:

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Question (44)

QN007254

In carbon dioxide, the percentage of carbon by mass is approximately:

(A) 12%
(B) 27.3%
(C) 50%
(D) 72.7%

Correct Answer: B

Explanation:

(12/44) × 100 = 27.3%

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Question (45)

QN007255

If a sample claimed to be pure water contains hydrogen and oxygen in the ratio 1 : 5 by mass, then:

(A) It obeys the law
(B) It is pure water
(C) It is not pure water
(D) Oxygen is absent

Correct Answer: C

Explanation:

Pure water must have hydrogen and oxygen in 1 : 8 ratio.

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Question (46)

QN007256

Which Indian scientific contribution is linked with atomic research and chemistry development?

(A) Raja Ramanna’s work in nuclear science
(B) Discovery of electron
(C) Discovery of proton
(D) Invention of thermometer

Correct Answer: A

Explanation:

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Question (47)

QN007257

A compound contains 15 g carbon and 40 g oxygen. The carbon : oxygen ratio is:

(A) 3 : 8
(B) 8 : 3
(C) 15 : 8
(D) 5 : 4

Correct Answer: A

Explanation:

15 : 40 simplifies to 3 : 8.

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Question (48)

QN007258

The Law of Constant Proportions helps chemists to:

(A) Predict weather
(B) Identify compounds accurately
(C) Measure electric current
(D) Study planetary motion

Correct Answer: B

Explanation:

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Question (49)

QN007259

Which statement correctly compares mixtures and compounds?

(A) Mixtures have fixed composition; compounds do not
(B) Compounds have fixed composition by mass
(C) Both always have fixed composition
(D) Neither has fixed composition

Correct Answer: B

Explanation:

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Question (50)

QN007260

The constant mass ratio in compounds exists because:

(A) Atoms combine in fixed numbers
(B) Elements lose all properties
(C) Molecules become unstable
(D) Matter disappears during reaction

Correct Answer: A

Explanation:

Atoms combine in fixed whole-number ratios.

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Question (41)

If 32 g oxygen combines with hydrogen according to the Law of Constant Proportions, hydrogen required is:

Explanation:

Link:

Question (42)

A compound formed using 10 g calcium and 14 g sulfur always contains these elements in the same ratio. This illustrates:

Explanation:

Link:

Question (43)

Which micro-component encourages deeper thinking about compounds and composition?

Explanation:

Link:

Question (44)

In carbon dioxide, the percentage of carbon by mass is approximately:

Explanation:

Link:

Question (45)

If a sample claimed to be pure water contains hydrogen and oxygen in the ratio 1 : 5 by mass, then:

Explanation:

Link:

Question (46)

Which Indian scientific contribution is linked with atomic research and chemistry development?

Explanation:

Link:

Question (47)

A compound contains 15 g carbon and 40 g oxygen. The carbon : oxygen ratio is:

Explanation:

Link:

Question (48)

The Law of Constant Proportions helps chemists to:

Explanation:

Link:

Question (49)

Which statement correctly compares mixtures and compounds?

Explanation:

Link:

Question (50)

The constant mass ratio in compounds exists because:

Explanation:

Link:

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