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Question
What will be the colour of litmus in an aqueous solution of ammonium chloride salt?
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Solution
Blue litmus turns red. The NH4Cl is formed from a weak base, ammonium hydroxide (NH4OH), and a strong acid, hydrochloric acid (HCl). So, when dissolved in water, NH4Cl will hydrolyse to form more H+ ions than OH− ions, making it acidic.
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