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Natural Indicators

Which of the ...

Question

Which of the following can change the colour of red litmus to blue?

A

Sodium hydroxide

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B

Sulphuric acid

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C

Vinegar

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D

Lemon juice

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Solution

The correct option is A Sodium hydroxide
Red litmus paper turns into blue when dipped in a basic solution.
Among the given options, only sodium hydroxide is a base. Hence, it changes the colour of red litmus to blue.
Rest of the substances are acidic, hence they do not have any effect on red litmus.

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Similar questions

Q. Which of the following statement is true for acids?
(a) Bitter and change red litmus to blue
(b) Sour and change red litmus to blue
(c) Sour and change blue litmus to red
(d) Bitter and change blue litmus to red

Q. Question 28.
Which of the following statement is true for acids?
(a) Bitter and change red litmus to blue
(b) Sour and change red litmus to blue
(c) Sour and change blue litmus to red
(d) Bitter and change blue litmus to red

Q. Which salt solution among the following will change the colour of blue litmus paper to red?

[1 mark]

Out of the following options, select all the compounds that can change the colour of wet blue litmus paper into the red colour?

Q. Consider the following statements:
1) Acids are sour in taste and change the colour of blue litmus to red.
2) Bases are bitter and change the colour of red litmus to blue.
3) Litmus is a natural indicator.
Which of the statements above are correct?

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