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Question (31)

QN00791

A lake receives untreated acidic waste from factories. Which property of the waste is most harmful to fish?

(A) Colour
(B) Acidity
(C) Smell
(D) Temperature only

Correct Answer: B

Explanation:

Acidic waste harms aquatic life.

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Question (32)

QN00792

A student mixes equal quantities of an acid and a base carefully. The final mixture is expected to be

(A) neutral
(B) strongly acidic
(C) strongly basic
(D) metallic

Correct Answer: A

Explanation:

Equal quantities can neutralise each other.

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Question (33)

QN00793

Which of the following best explains why baking soda helps after an ant bite?

(A) It cools the skin only
(B) It neutralises the acidic effect
(C) It adds more acid
(D) It removes the skin completely

Correct Answer: B

Explanation:

Baking soda neutralises formic acid.

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Question (34)

QN00794

The reaction between an acid and a base usually produces heat. Such a reaction is said to involve

(A) heat evolution
(B) freezing
(C) condensation
(D) magnetism

Correct Answer: A

Explanation:

Heat is evolved during neutralisation.

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Question (35)

QN00795

Which example shows neutralisation used for environmental protection?

(A) Drying grains in sunlight
(B) Neutralising factory waste before release
(C) Storing water in tanks
(D) Boiling milk

Correct Answer: B

Explanation:

Neutralisation reduces environmental harm.

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Question (36)

QN00796

A student adds lime water drop by drop into acidic solution. Why is swirling done after each addition?

(A) To freeze the solution
(B) To mix the substances properly
(C) To remove colour
(D) To reduce heat completely

Correct Answer: B

Explanation:

Swirling ensures proper mixing.

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Question (37)

QN00797

If excess base is added during neutralisation, the final solution will show properties of

(A) acids
(B) bases
(C) salts only
(D) gases only

Correct Answer: B

Explanation:

Excess base makes the solution basic.

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Question (38)

QN00798

Which of the following daily-life situations involves neutralisation?

(A) Treating acidic soil with lime
(B) Melting candle wax
(C) Washing clothes with plain water
(D) Sharpening a pencil

Correct Answer: A

Explanation:

Lime neutralises acidic soil.

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Question (39)

QN00799

Why are acidic industrial wastes treated before entering lakes?

(A) To increase fish population instantly
(B) To neutralise harmful acidity
(C) To change lake colour
(D) To produce oxygen bubbles

Correct Answer: B

Explanation:

Neutralisation reduces harmful acidity.

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Question (40)

QN00800

Which statement about neutralisation is correct?

(A) Only acids are formed
(B) Only bases are formed
(C) Acid and base react to form salt and water
(D) Heat is always absorbed

Correct Answer: C

Explanation:

Neutralisation forms salt and water.

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Question (31)

A lake receives untreated acidic waste from factories. Which property of the waste is most harmful to fish?

Explanation:

Link:

Question (32)

A student mixes equal quantities of an acid and a base carefully. The final mixture is expected to be

Explanation:

Link:

Question (33)

Which of the following best explains why baking soda helps after an ant bite?

Explanation:

Link:

Question (34)

The reaction between an acid and a base usually produces heat. Such a reaction is said to involve

Explanation:

Link:

Question (35)

Which example shows neutralisation used for environmental protection?

Explanation:

Link:

Question (36)

A student adds lime water drop by drop into acidic solution. Why is swirling done after each addition?

Explanation:

Link:

Question (37)

If excess base is added during neutralisation, the final solution will show properties of

Explanation:

Link:

Question (38)

Which of the following daily-life situations involves neutralisation?

Explanation:

Link:

Question (39)

Why are acidic industrial wastes treated before entering lakes?

Explanation:

Link:

Question (40)

Which statement about neutralisation is correct?

Explanation:

Link:

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