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Question (21)

QN00741

Which flower changes colour depending on the acidic or basic nature of soil?

(A) Rose
(B) Lotus
(C) Hydrangea
(D) Sunflower

Correct Answer: C

Explanation:

Hydrangea flowers change colour with soil nature.

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Question (22)

QN00742

In acidic soil, hydrangea flowers are generally

(A) yellow
(B) blue
(C) white
(D) orange

Correct Answer: B

Explanation:

Acidic soil produces blue hydrangea flowers.

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Question (23)

QN00743

Which of the following can act as a natural indicator?

(A) Purple cabbage
(B) Jamun
(C) Red hibiscus
(D) All of these

Correct Answer: D

Explanation:

All these substances can act as indicators.

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Question (24)

QN00744

Onion is considered an olfactory indicator because

(A) it changes colour
(B) it changes taste
(C) its odour changes in acidic or basic medium
(D) it dissolves in water

Correct Answer: C

Explanation:

Olfactory indicators change smell in acids or bases.

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Question (25)

QN00745

A student added blue litmus solution to diluted lemon juice. The solution became red. After adding lime water slowly, the colour finally turned blue. This shows that lime water

(A) increased acidity
(B) neutralised the acid
(C) formed sugar
(D) removed water

Correct Answer: B

Explanation:

Lime water neutralised the acidic solution.

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Question (26)

QN00746

In a neutralisation reaction, the products formed are generally

(A) acid and heat
(B) base and water
(C) salt and water
(D) salt and acid

Correct Answer: C

Explanation:

Neutralisation forms salt and water.

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Question (27)

QN00747

During neutralisation, heat is

(A) absorbed
(B) released
(C) destroyed
(D) converted to light only

Correct Answer: B

Explanation:

Heat is evolved in neutralisation.

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Question (28)

QN00748

Which equation correctly represents neutralisation?

(A) Acid + Acid → Salt
(B) Base + Base → Water
(C) Acid + Base → Salt + Water + Heat
(D) Salt + Water → Acid + Base

Correct Answer: C

Explanation:

Neutralisation forms salt, water and heat.

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Question (29)

QN00749

A red ant bite causes stinging because the ant injects

(A) a base
(B) salt water
(C) formic acid
(D) sugar solution

Correct Answer: C

Explanation:

Ant bites inject formic acid.

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Question (30)

QN00750

Moist baking soda relieves the pain of an ant bite because it

(A) increases acidity
(B) neutralises the acid
(C) adds more formic acid
(D) cools the skin only

Correct Answer: B

Explanation:

Baking soda neutralises formic acid.

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Question (21)

Which flower changes colour depending on the acidic or basic nature of soil?

Explanation:

Link:

Question (22)

In acidic soil, hydrangea flowers are generally

Explanation:

Link:

Question (23)

Which of the following can act as a natural indicator?

Explanation:

Link:

Question (24)

Onion is considered an olfactory indicator because

Explanation:

Link:

Question (25)

A student added blue litmus solution to diluted lemon juice. The solution became red. After adding lime water slowly, the colour finally turned blue. This shows that lime water

Explanation:

Link:

Question (26)

In a neutralisation reaction, the products formed are generally

Explanation:

Link:

Question (27)

During neutralisation, heat is

Explanation:

Link:

Question (28)

Which equation correctly represents neutralisation?

Explanation:

Link:

Question (29)

A red ant bite causes stinging because the ant injects

Explanation:

Link:

Question (30)

Moist baking soda relieves the pain of an ant bite because it

Explanation:

Link:

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