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Question (11)

QN007421

Which compound is likely to have the lowest boiling point?

(A) NaCl
(B) MgO
(C) H₂O
(D) CO₂

Correct Answer: D

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Question (12)

QN007422

Ionic compounds are hard because:

(A) Molecules are weakly bonded
(B) Strong forces exist between ions
(C) They contain free electrons
(D) They are metallic

Correct Answer: B

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Question (13)

QN007423

Which covalent compound exists as gas at room temperature?

(A) Sodium chloride
(B) Calcium oxide
(C) Hydrogen
(D) Magnesium oxide

Correct Answer: C

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Question (14)

QN007424

Ionic compounds are generally brittle because:

(A) Ions shift and cause repulsion
(B) Molecules evaporate
(C) Electrons escape
(D) Protons move freely

Correct Answer: A

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Question (15)

QN007425

Which state of sodium chloride does NOT conduct electricity?

(A) Molten state
(B) Aqueous solution
(C) Solid state
(D) Liquid state

Correct Answer: C

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Question (16)

QN007426

Covalent compounds are formed by:

(A) Transfer of electrons
(B) Sharing of electrons
(C) Transfer of neutrons
(D) Loss of protons

Correct Answer: B

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Question (17)

QN007427

Which compound is expected to dissolve in water easily?

(A) Wax
(B) Kerosene
(C) Sodium chloride
(D) Petrol

Correct Answer: C

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Question (18)

QN007428

Which among the following is an ionic compound?

(A) H₂O
(B) NH₃
(C) Na₂O
(D) CO₂

Correct Answer: C

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Question (19)

QN007429

The strong force between ions in ionic compounds is called:

(A) Magnetic force
(B) Electrostatic force
(C) Gravitational force
(D) Nuclear force

Correct Answer: B

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Question (20)

QN007430

Which property best distinguishes covalent compounds from ionic compounds?

(A) Presence of atoms
(B) Poor electrical conductivity
(C) Existence of molecules
(D) Formation of solids

Correct Answer: B

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Question (11)

Which compound is likely to have the lowest boiling point?

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Question (12)

Ionic compounds are hard because:

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Question (13)

Which covalent compound exists as gas at room temperature?

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Question (14)

Ionic compounds are generally brittle because:

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Question (15)

Which state of sodium chloride does NOT conduct electricity?

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Question (16)

Covalent compounds are formed by:

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Question (17)

Which compound is expected to dissolve in water easily?

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Question (18)

Which among the following is an ionic compound?

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Question (19)

The strong force between ions in ionic compounds is called:

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Question (20)

Which property best distinguishes covalent compounds from ionic compounds?

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