a colourless gas is liberated when sodum is dropped into water. name the gas evolved and write a test to identify the gas.
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The following reaction takes place-
Na + H2O---->NaOH + H2 + Heat
The gas evolved is hydrogen.
To test this, bring the test tube infront of a burning candle by closing the test tube with your thumb and then releasing it near the burning candle. This will give you a pop sound. This shows that hydrogen is evolved.