The elements whose oxides can turn limus solution red are:
(a) lithium and sodium (b) co.

copper and potassium
(c) carbon and hydrogen (d) phosphorus and sulphur

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Solution

Answer :

(d) phosphorus and sulphur
Phosphorus and sulphur are non-metals whose oxides are acidic in nature. These oxides turn blue litmus solution to red.

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The element whose oxide will turn red litmus solution to blue will be:

(a) sodium

(b) sulphur

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The salt whose aqueous solution will turn blue litmus to red is :

(a) ammonium sulphate

(b) sodium acetate

(d) potassium carbonate

The aqueous solution of one of the following salts will turn red litmus to blue. This salt is :

(a) potassium sulphate

(b) sodium sulphate

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