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Universal Indicator

A student add...

Question

A student added a drop of universal indicator to 1ml of a solution that changed to purple colour. The solution can be

A

H C l

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B

N a O H

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C

H_{2} O

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D

C H_{3} C O O H

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Solution

The correct option is B $N a O H$

a) HCl being a strong acid, will change the colour to red.
b) NaOH being a strong base, will change the colour to purple.
c) $H_{2} O$ being neutral, will change the colour to green.
d) $C H_{3} C O O H$ being a weak acid, will change the colour close to lime green.

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