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0.1 M solution of which one of these substances will be basic?

1. Sodium borate
2. Ammonium chloride
3. Calcium nitrate
4. Sodium sulphate

Correct answer: Sodium borate

Solution

Sodium borate (Na2B4O7) is a salt of a weak acid (boric acid) and a strong base (sodium hydroxide), making its solution basic. The other options involve neutral or acidic salts.

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