JEE Main Chemistry question
Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is: , , , , , , , **[JEE Advanced 2010]**
Answer: 3
Solution
A solution turns red litmus blue if it is basic (salt of strong base + weak acid, or weak base/weak acid salt that is net basic). - : salt of strong base (KOH) + weak acid (HCN) → basic ✓ - : both ions weak; → net
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