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Question
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change ?
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change ?
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Solution
The correct option is D Hydrochloric acid
To reverse the colour of the litmus solution to red, the aqueous solution needs to be acidic- lower the pH of the solution.
An excess of an acidic solution needs to be added to change the colour of litmus back to red.
Out of all the options, excess Hydrochloric acid can reverse the change of colour to red.
To reverse the colour of the litmus solution to red, the aqueous solution needs to be acidic- lower the pH of the solution.
An excess of an acidic solution needs to be added to change the colour of litmus back to red.
Out of all the options, excess Hydrochloric acid can reverse the change of colour to red.
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