Question

When a white powdered substance 'X' is added to dilute HCl in a test tube, a brisk effervescence is observed with the liberation of a gas. A burning candle, brought near the mouth of test tube, is extinguished. Substance 'X' can be *



1.Zinc

2.Sodium bicarbonate

3.Sodium hydroxide

4.Calcium oxide
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Answer 1

Answer:

It is calcium hydroxide