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Question

The elements whose acids can turn litmus solution red are :

A
lithium and sodium
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B
copper and potassium
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C
carbon and hydrogen
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D
phosphorous and sulphur
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Solution

The correct option is D phosphorous and sulphur
The elements whose acids can turn litmus solution red are phosphorous and sulphur.
Phosphorous and sulphur gives phosphoric and sulphuric acids respectively. Litmus solution is blue in alkaline medium and red in acidic medium.

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