GK
ELEMENTS COMPOUNDS SUBSTANCES METALS AND NON METALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Red
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Green
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Yellow
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Dark blue
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Detailed explanation-1: -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.
Detailed explanation-2: -The sulphurous acid turns blue litmus paper to red.
Detailed explanation-3: -Sulphurous acid turns blue litmus red as it is the property of acids to turn blue litmus red.
Detailed explanation-4: -So, Acids turn blue litmus red whereas bases turn red litmus blue.
Detailed explanation-5: -When sulphur dioxide is dissolved in water, it liberates hydrogen cations in water (As sulphur dioxide becomes sulphurous acid). It makes the solution acidic. As we know, the acidic solution turns blue litmus into red.