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Question (11)

QN007271

If two hydrogen atoms combine with one oxygen atom, the compound formed is:

(A) CO₂
(B) NH₃
(C) H₂O
(D) SO₂

Correct Answer: C

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Question (12)

QN007272

According to Dalton, atoms of oxygen differ from atoms of hydrogen in:

(A) Colour only
(B) Mass and chemical properties
(C) State only
(D) Temperature only

Correct Answer: B

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Question (13)

QN007273

Which law is explained by the fixed combination of atoms in compounds?

(A) Law of Constant Proportions
(B) Newton’s Law
(C) Law of Reflection
(D) Archimedes’ Principle

Correct Answer: A

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Question (14)

QN007274

Dalton’s theory considered atoms to be:

(A) Divisible into electrons and protons
(B) Continuous matter
(C) Smallest particles of matter
(D) Energy packets

Correct Answer: C

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Question (15)

QN007275

Which scientist proposed the Atomic Theory in 1808?

(A) Rutherford
(B) Dalton
(C) Thomson
(D) Bohr

Correct Answer: B

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Question (16)

QN007276

If atoms are conserved during a reaction, the total mass:

(A) Decreases always
(B) Increases always
(C) Remains constant
(D) Becomes zero

Correct Answer: C

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Question (17)

QN007277

According to Dalton’s Atomic Theory, water is formed because:

(A) Hydrogen atoms combine with oxygen atoms in fixed ratio
(B) Oxygen atoms disappear
(C) Water contains free electrons
(D) Atoms split during reaction

Correct Answer: A

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Question (18)

QN007278

Which statement best supports Dalton’s idea of indivisible atoms at that time?

(A) Discovery of electron had not occurred yet
(B) Nuclear fission was known
(C) Proton was already discovered
(D) Quantum theory existed

Correct Answer: A

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Question (19)

QN007279

Atoms of sodium and chlorine combine to form sodium chloride in:

(A) Random ratio
(B) Simple whole-number ratio
(C) Fractional ratio only
(D) Equal volume ratio only

Correct Answer: B

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Question (20)

QN007280

Dalton’s Atomic Theory was based mainly on:

(A) Laws of chemical combination
(B) Theory of relativity
(C) Electromagnetic waves
(D) Cell theory

Correct Answer: A

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Question (11)

If two hydrogen atoms combine with one oxygen atom, the compound formed is:

Explanation:

Link:

Question (12)

According to Dalton, atoms of oxygen differ from atoms of hydrogen in:

Explanation:

Link:

Question (13)

Which law is explained by the fixed combination of atoms in compounds?

Explanation:

Link:

Question (14)

Dalton’s theory considered atoms to be:

Explanation:

Link:

Question (15)

Which scientist proposed the Atomic Theory in 1808?

Explanation:

Link:

Question (16)

If atoms are conserved during a reaction, the total mass:

Explanation:

Link:

Question (17)

According to Dalton’s Atomic Theory, water is formed because:

Explanation:

Link:

Question (18)

Which statement best supports Dalton’s idea of indivisible atoms at that time?

Explanation:

Link:

Question (19)

Atoms of sodium and chlorine combine to form sodium chloride in:

Explanation:

Link:

Question (20)

Dalton’s Atomic Theory was based mainly on:

Explanation:

Link:

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