A blue litmus paper was first dipped I dilute hydrochloric acid and then in dilute sodium hydroxide solution. It was observed that the colour of the litmus paper:
A) changed to red B) changed first to red and then to blue C) changed blue to colourless D) remained blue in both solutions.
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The acids change BLUE litmus to RED.
And base change RED litmus to BLUE .
WE KNOW , HCL is an acid , and sodium hydroxide is base .
so, the answer is (B) change first to red and then to blue .
And base change RED litmus to BLUE .
WE KNOW , HCL is an acid , and sodium hydroxide is base .
so, the answer is (B) change first to red and then to blue .
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