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Question (11)

QN0029783

A student found that blue hydrangea flowers were growing in a garden. This indicates that the soil is likely to be

(A) acidic
(B) basic
(C) neutral
(D) dry only

Correct Answer: A

Explanation:

Hydrangea flowers become blue in acidic soil.

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Question (12)

QN0029784

Which of the following is an olfactory indicator?

(A) Litmus
(B) Turmeric
(C) Onion
(D) Rose extract

Correct Answer: C

Explanation:

Onion acts as an olfactory indicator.

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Question (13)

QN0029785

A solution changed blue litmus to red but showed no change with turmeric paper. The solution is likely to be

(A) acidic
(B) basic
(C) neutral
(D) salty

Correct Answer: A

Explanation:

Acids turn blue litmus red but do not affect turmeric.

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Question (14)

QN0029786

Which of the following best explains why compost is useful in basic soil?

(A) It releases bases into soil
(B) It releases acids into soil
(C) It removes nutrients
(D) It increases dryness

Correct Answer: B

Explanation:

Organic matter releases acids that neutralise basic soil.

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Question (15)

QN0029787

A student added excess baking soda to vinegar. The final solution would most likely be

(A) acidic
(B) basic
(C) neutral always
(D) colourless only

Correct Answer: B

Explanation:

Excess base makes the solution basic.

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Question (16)

QN0029788

Which scientist is known as the “Father of Modern Indian Chemistry”?

(A) Jagadish Chandra Bose
(B) C.V. Raman
(C) P.C. Ray
(D) Homi Bhabha

Correct Answer: C

Explanation:

P.C. Ray is called the Father of Modern Indian Chemistry.

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Question (17)

QN0029789

A student prepared a hidden message using soap solution on turmeric-coated paper. Which colour would appear on the writing?

(A) Blue
(B) Red
(C) Green
(D) Yellow

Correct Answer: B

Explanation:

Soap is basic and turns turmeric red.

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Question (18)

QN0029790

Which of the following substances is most likely neutral?

(A) Vinegar
(B) Soap solution
(C) Sugar solution
(D) Lime water

Correct Answer: C

Explanation:

Sugar solution is neutral.

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Question (19)

QN0029791

A student mixed tamarind water with lime water in a test tube. After some time, the solution stopped showing acidic behaviour. This happened because

(A) the acid evaporated completely
(B) the base changed into water
(C) neutralisation occurred
(D) the solution froze

Correct Answer: C

Explanation:

Acid and base cancel each other’s effect.

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Question (20)

QN0029792

Which of the following examples best shows the importance of science in society?

(A) Neutralising industrial waste before releasing it into lakes
(B) Storing sugar in containers
(C) Drying clothes in sunlight
(D) Sharpening pencils

Correct Answer: A

Explanation:

Neutralisation protects aquatic life and the environment.

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Question (11)

A student found that blue hydrangea flowers were growing in a garden. This indicates that the soil is likely to be

Explanation:

Link:

Question (12)

Which of the following is an olfactory indicator?

Explanation:

Link:

Question (13)

A solution changed blue litmus to red but showed no change with turmeric paper. The solution is likely to be

Explanation:

Link:

Question (14)

Which of the following best explains why compost is useful in basic soil?

Explanation:

Link:

Question (15)

A student added excess baking soda to vinegar. The final solution would most likely be

Explanation:

Link:

Question (16)

Which scientist is known as the “Father of Modern Indian Chemistry”?

Explanation:

Link:

Question (17)

A student prepared a hidden message using soap solution on turmeric-coated paper. Which colour would appear on the writing?

Explanation:

Link:

Question (18)

Which of the following substances is most likely neutral?

Explanation:

Link:

Question (19)

A student mixed tamarind water with lime water in a test tube. After some time, the solution stopped showing acidic behaviour. This happened because

Explanation:

Link:

Question (20)

Which of the following examples best shows the importance of science in society?

Explanation:

Link:

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