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There is no change in the colour of red ...

There is no change in the colour of red litmus and blue litmus paper when introduced into an aqueous solution of sodium chloride. After passing direct current through the same solution, red litmus changes to blue colour. Which product is responsible for this change ? Mention any two uses of this product.

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Sodium hydroxide/NaOH
(i) De-greasing metals
Soaps and detergents
(iii) Paper making
(iv) Artifical fibres
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