H₂SO₃ (Sulphurous acid) turns-

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red litmus to blue

blue litmus to red

red litmus remains red

blue litmus remains blue

answer is B.

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Detailed Solution

Sulphurous acid (H₂SO₃) is an acid. The main use of litmus is to test whether a solution is acidic or basic. Blue litmus paper turns red under acidic conditions. So, sulphurous acid turns blue litmus into the red.

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