A blue litmus paper was first dipped in dilute $H C l$ and then in dilute $N a O H$ solution. It was observed that the colour of the litmus paper ___________.

changed to red

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firstly changed to red and then to blue

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changed blue to colourless

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remained blue in both the solutions

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Solution

The correct option is B firstly changed to red and then to blue
In acid blue litmus changes to red and in basic solution red litmus changes to blue. Hence blue litmus first changes its color to red and then to blue.

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When a red litmus paper is dipped in the aqueous solution of $X$ there is no change in colour.
When a blue litmus paper is dipped in the same solution it turns red.
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A blue litmus paper was first dipped in dilute HCl and then in dilute NaOH solution. It was observed that the colour of the litmus paper ___________.

The correct option is B firstly changed to red and then to blueIn acid blue litmus changes to red and in basic solution red litmus changes to blue. Hence blue litmus first changes its color to red and then to blue.

A blue litmus paper was first dipped in dilute $H C l$ and then in dilute $N a O H$ solution. It was observed that the colour of the litmus paper ___________.

The correct option is B firstly changed to red and then to blue
In acid blue litmus changes to red and in basic solution red litmus changes to blue. Hence blue litmus first changes its color to red and then to blue.