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Question (1)

QN00721

A student puts lemon juice on blue litmus paper. What will be observed?

(A) Blue litmus turns green
(B) Blue litmus turns red
(C) Blue litmus remains blue
(D) Blue litmus turns yellow

Correct Answer: B

Explanation:

Acids turn blue litmus paper red.

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Question (2)

QN00722

A solution changes red litmus paper to blue. The solution is most likely

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

Correct Answer: C

Explanation:

Bases turn red litmus paper blue.

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Question (3)

QN00723

Which of the following substances is neutral in nature according to the activity table?

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

Correct Answer: C

Explanation:

Salt solution does not affect litmus paper.

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Question (4)

QN00724

A student tested four samples with blue litmus paper. Only one sample changed the colour to red. Which sample was it likely to be?

(A) Baking soda solution
(B) Soap solution
(C) Lemon juice
(D) Lime water

Correct Answer: C

Explanation:

Lemon juice is acidic.

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Question (5)

QN00725

Litmus is obtained from

(A) turmeric
(B) lichens
(C) hibiscus
(D) beetroot

Correct Answer: B

Explanation:

Litmus is a natural substance obtained from lichens.

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Question (6)

QN00726

The substances that show different colours in acidic and basic solutions are called

(A) salts
(B) indicators
(C) crystals
(D) solvents

Correct Answer: B

Explanation:

Indicators show colour changes in acids and bases.

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Question (7)

QN00727

A student grouped tamarind water, vinegar, and amla juice together because they all

(A) turned red litmus blue
(B) tasted bitter
(C) turned blue litmus red
(D) were neutral

Correct Answer: C

Explanation:

Acidic substances turn blue litmus red.

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Question (8)

QN00728

Which pair contains only basic substances?

(A) Soap solution and lime water
(B) Vinegar and lemon juice
(C) Salt solution and sugar solution
(D) Tamarind water and amla juice

Correct Answer: A

Explanation:

Soap solution and lime water are basic.

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Question (9)

QN00729

A liquid does not change the colour of either red or blue litmus paper. The liquid is likely to be

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

Correct Answer: C

Explanation:

Neutral substances do not change litmus colour.

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Question (10)

QN00730

Which statement is correct about acids?

(A) They generally taste bitter
(B) They generally taste sour
(C) They feel slippery
(D) They turn red litmus blue

Correct Answer: B

Explanation:

Acids generally taste sour.

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Question (1)

A student puts lemon juice on blue litmus paper. What will be observed?

Explanation:

Link:

Question (2)

A solution changes red litmus paper to blue. The solution is most likely

Explanation:

Link:

Question (3)

Which of the following substances is neutral in nature according to the activity table?

Explanation:

Link:

Question (4)

A student tested four samples with blue litmus paper. Only one sample changed the colour to red. Which sample was it likely to be?

Explanation:

Link:

Question (5)

Litmus is obtained from

Explanation:

Link:

Question (6)

The substances that show different colours in acidic and basic solutions are called

Explanation:

Link:

Question (7)

A student grouped tamarind water, vinegar, and amla juice together because they all

Explanation:

Link:

Question (8)

Which pair contains only basic substances?

Explanation:

Link:

Question (9)

A liquid does not change the colour of either red or blue litmus paper. The liquid is likely to be

Explanation:

Link:

Question (10)

Which statement is correct about acids?

Explanation:

Link:

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