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Question (1)

QN002731

Which of the following are the two types of pure substances discussed in the chapter?

(A) Metals and non-metals
(B) Elements and compounds
(C) Solids and liquids
(D) Mixtures and alloys

Correct Answer: B

Explanation:

Pure substances are classified as elements and compounds.

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Question (2)

QN002732

A substance that cannot be broken down into simpler substances is called

(A) mixture
(B) compound
(C) element
(D) alloy

Correct Answer: C

Explanation:

Elements are the simplest substances.

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Question (3)

QN002733

The smallest particle of an element is called

(A) molecule
(B) atom
(C) ion
(D) mixture

Correct Answer: B

Explanation:

Atoms are the basic particles of elements.

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Question (4)

QN002734

Two hydrogen atoms combine to form one

(A) hydrogen atom
(B) oxygen molecule
(C) hydrogen molecule
(D) compound

Correct Answer: C

Explanation:

Two hydrogen atoms form one hydrogen molecule.

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Question (5)

QN002735

Which of the following is an element?

(A) Water
(B) Sugar
(C) Oxygen
(D) Bronze

Correct Answer: C

Explanation:

Oxygen is an element made of one type of atoms.

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Question (6)

QN002736

Water breaks into hydrogen and oxygen when

(A) cooled
(B) filtered
(C) electricity is passed through it
(D) evaporated

Correct Answer: C

Explanation:

Electrolysis splits water into hydrogen and oxygen.

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Question (7)

QN002737

In the electrolysis activity, dilute sulfuric acid was added to water mainly to

(A) change water colour
(B) cool the solution
(C) help electricity pass through water
(D) produce carbon dioxide

Correct Answer: C

Explanation:

Dilute sulfuric acid increases conductivity.

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Question (8)

QN002738

Which gas produces a ‘pop’ sound when tested with a burning candle?

(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Carbon dioxide

Correct Answer: C

Explanation:

Hydrogen burns with a pop sound.

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Question (9)

QN002739

The gas that makes a candle flame glow brighter is

(A) hydrogen
(B) oxygen
(C) nitrogen
(D) helium

Correct Answer: B

Explanation:

Oxygen supports combustion strongly.

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Question (10)

QN002740

The ratio of hydrogen atoms to oxygen atoms in water is

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

Correct Answer: C

Explanation:

Water contains two hydrogen atoms for every oxygen atom.

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Question (1)

Which of the following are the two types of pure substances discussed in the chapter?

Explanation:

Link:

Question (2)

A substance that cannot be broken down into simpler substances is called

Explanation:

Link:

Question (3)

The smallest particle of an element is called

Explanation:

Link:

Question (4)

Two hydrogen atoms combine to form one

Explanation:

Link:

Question (5)

Which of the following is an element?

Explanation:

Link:

Question (6)

Water breaks into hydrogen and oxygen when

Explanation:

Link:

Question (7)

In the electrolysis activity, dilute sulfuric acid was added to water mainly to

Explanation:

Link:

Question (8)

Which gas produces a ‘pop’ sound when tested with a burning candle?

Explanation:

Link:

Question (9)

The gas that makes a candle flame glow brighter is

Explanation:

Link:

Question (10)

The ratio of hydrogen atoms to oxygen atoms in water is

Explanation:

Link:

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