Litmus shows red colour when the $H^{+}$ concentration in the solution is :

1 \times 10^{- 11} M

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1 \times 10^{- 9} M

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1 \times 10^{- 7} M

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1 \times 10^{- 5} M

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1 \times 10^{- 14} M

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Solution

The correct option is C $1 \times 10^{- 5} M$
Acids: Turns blue litmus paper/ solution red. Base turn red litmus into blue.
Litmus shows red when the $H^{+}$ concentration in the solution is less than $1 \times 10^{- 7} M$ .
Therefore, the solution with $H^{+}$ ion concentration $1 \times 10^{- 5} M$ will turn blue litmus red.
So, option D is the right option.

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Litmus shows red colour when the H+ concentration in the solution is :

Litmus shows red colour when the $H^{+}$ concentration in the solution is :