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Question (21)

QN00781

Which substance used in the activity acts as a base?

(A) Lemon juice
(B) Lime water
(C) Vinegar
(D) Tamarind water

Correct Answer: B

Explanation:

Lime water is basic.

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Question (22)

QN00782

A solution remains red even after adding a few drops of lime water. This indicates that

(A) all acid has been neutralised
(B) the solution is still acidic
(C) the solution became basic
(D) heat was not released

Correct Answer: B

Explanation:

Acid is still present in excess.

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Question (23)

QN00783

A student accidentally adds excess lemon juice after neutralisation. The solution will become

(A) acidic again
(B) basic again
(C) permanently neutral
(D) solid

Correct Answer: A

Explanation:

Excess acid makes the solution acidic again.

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Question (24)

QN00784

Which of the following is NOT a product of neutralisation?

(A) Salt
(B) Water
(C) Heat
(D) Oxygen

Correct Answer: D

Explanation:

Oxygen is not formed in neutralisation.

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Question (25)

QN00785

In neutralisation, the acid and base

(A) strengthen each other
(B) cancel each other’s effect
(C) evaporate completely
(D) form only gases

Correct Answer: B

Explanation:

Acid and base neutralise each other.

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Question (26)

QN00786

The colour change from blue to red in litmus indicates the presence of

(A) base
(B) neutral substance
(C) acid
(D) salt only

Correct Answer: C

Explanation:

Acids turn blue litmus red.

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Question (27)

QN00787

Which pair can undergo neutralisation?

(A) Lemon juice and lime water
(B) Vinegar and tamarind water
(C) Soap solution and baking soda solution
(D) Sugar solution and salt solution

Correct Answer: A

Explanation:

Acid and base undergo neutralisation.

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Question (28)

QN00788

The process used to reduce the harmful effect of acidic soil is called

(A) evaporation
(B) filtration
(C) neutralisation
(D) condensation

Correct Answer: C

Explanation:

Neutralisation balances soil nature.

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Question (29)

QN00789

Which observation confirms that lime water has neutralised lemon juice solution?

(A) The solution freezes
(B) The colour changes from red to blue
(C) The solution becomes yellow
(D) Gas bubbles appear immediately

Correct Answer: B

Explanation:

Blue colour indicates basic nature.

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Question (30)

QN00790

Neutralisation reactions are useful in agriculture because they help in

(A) increasing rainfall
(B) balancing soil nature
(C) making soil dry
(D) producing seeds instantly

Correct Answer: B

Explanation:

Neutralisation helps maintain proper soil condition.

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Question (21)

Which substance used in the activity acts as a base?

Explanation:

Link:

Question (22)

A solution remains red even after adding a few drops of lime water. This indicates that

Explanation:

Link:

Question (23)

A student accidentally adds excess lemon juice after neutralisation. The solution will become

Explanation:

Link:

Question (24)

Which of the following is NOT a product of neutralisation?

Explanation:

Link:

Question (25)

In neutralisation, the acid and base

Explanation:

Link:

Question (26)

The colour change from blue to red in litmus indicates the presence of

Explanation:

Link:

Question (27)

Which pair can undergo neutralisation?

Explanation:

Link:

Question (28)

The process used to reduce the harmful effect of acidic soil is called

Explanation:

Link:

Question (29)

Which observation confirms that lime water has neutralised lemon juice solution?

Explanation:

Link:

Question (30)

Neutralisation reactions are useful in agriculture because they help in

Explanation:

Link:

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