Three test tubes A, B and C contain distilled water, an acidic solution and a basic solution respectively.
Three test tubes A, B and C contain distilled water, an acidic solution and a basic solution respectively. When red litmus solution is used for testing these solutions, the observed colour changes respectively will be :
(a) A - no change; B - becomes dark red; C - becomes blue
(b) A - becomes light red; B - becomes blue; C - becomes red
(c) A - becomes red; B - no change; C - becomes blue
(d) A - becomes light red; B - becomes dark red; C - becomes blue
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Correct answer is (a) A - no change; B - becomes dark red; C - becomes blue
In distilled water neighter red litmus nor blue litmus paper, changes their colours.
In acidic medium - Red litmus paper becomes dark red.
In basic medium - Red litmus paper - becomes blue.
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