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Question

Which indicator is correctly paired up with its proper color if it were added to a base?
 
i. Litmus - blue 
ii. Phenolphthalein - pink
iii. Methyl orange - yellow


A
(i) only
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B
(ii) only
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C
(iii) only
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D
(i) and (iii) only
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E
(i), (ii) and (iii)
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Solution

The correct option is E (i), (ii) and (iii)
Litmus - It is a type of natural indicator which is made up of lichens. In an acidic solution, its colour turns red. In the basic solution, its colour changes to blue.
Phenolphthalein - It is an acid-base indicator that turns colourless in acidic solution, and turns pink to red in alkaline solution. Here it is a weak base.

Methyl orange - It is a pH indicator. It turns red in acidic solution and yellowish in basic solution.

Hence, the correct option is E.

Chemistry

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