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Question (21)

QN007281

Which concept from Dalton’s theory explains why compounds have fixed composition?

(A) Atoms are radioactive
(B) Atoms combine in fixed ratios
(C) Atoms have nuclei
(D) Atoms emit electrons

Correct Answer: B

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Question (22)

QN007282

According to Dalton, atoms participate in chemical reactions by:

(A) Breaking into smaller particles
(B) Changing into energy
(C) Rearranging themselves
(D) Vanishing completely

Correct Answer: C

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Question (23)

QN007283

Which statement correctly represents Dalton’s view about atoms of carbon?

(A) They are larger than all atoms
(B) They are identical in mass and properties
(C) They are continuously created
(D) They contain neutrons and electrons

Correct Answer: B

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Question (24)

QN007284

Which pair of laws was explained using Dalton’s Atomic Theory?

(A) Conservation of Mass and Constant Proportions
(B) Newton’s Laws and Kepler’s Laws
(C) Boyle’s Law and Charles’ Law
(D) Ohm’s Law and Joule’s Law

Correct Answer: A

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Question (25)

QN007285

If atoms combine in whole-number ratios, which compound is correctly represented?

(A) H₁.₅O
(B) Na₀.₅Cl
(C) CO₂
(D) H₀.₂O

Correct Answer: C

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Question (26)

QN007286

Dalton assumed atoms to be indivisible because:

(A) Experimental evidence of subatomic particles was absent
(B) Atoms were visible directly
(C) Electrons were known already
(D) Nuclear reactions were common

Correct Answer: A

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Question (27)

QN007287

According to Dalton, compounds are pure substances because:

(A) They contain fixed types of atoms
(B) They contain free ions only
(C) Their atoms disappear during reactions
(D) Their composition changes randomly

Correct Answer: A

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Question (28)

QN007288

Which of the following agrees with Dalton’s Atomic Theory?

(A) Atoms can be divided chemically
(B) Atoms combine in fixed ratios
(C) Atoms are continuously produced in reactions
(D) Different elements have identical atoms

Correct Answer: B

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Question (29)

QN007289

In ammonia (NH₃), nitrogen and hydrogen atoms combine in the ratio:

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

Correct Answer: A

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Question (30)

QN007290

Dalton’s Atomic Theory could not explain:

(A) Law of Constant Proportions
(B) Formation of compounds
(C) Discovery of subatomic particles
(D) Conservation of mass

Correct Answer: C

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Question (21)

Which concept from Dalton’s theory explains why compounds have fixed composition?

Explanation:

Link:

Question (22)

According to Dalton, atoms participate in chemical reactions by:

Explanation:

Link:

Question (23)

Which statement correctly represents Dalton’s view about atoms of carbon?

Explanation:

Link:

Question (24)

Which pair of laws was explained using Dalton’s Atomic Theory?

Explanation:

Link:

Question (25)

If atoms combine in whole-number ratios, which compound is correctly represented?

Explanation:

Link:

Question (26)

Dalton assumed atoms to be indivisible because:

Explanation:

Link:

Question (27)

According to Dalton, compounds are pure substances because:

Explanation:

Link:

Question (28)

Which of the following agrees with Dalton’s Atomic Theory?

Explanation:

Link:

Question (29)

In ammonia (NH₃), nitrogen and hydrogen atoms combine in the ratio:

Explanation:

Link:

Question (30)

Dalton’s Atomic Theory could not explain:

Explanation:

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