Is Matter Around Us Pure : DPP for class 9th

Quiz by JR World

Is Matter Around Us Pure

Question 1 of 45

A student heats solid copper sulphate in a dry test and reports the following observations. The observation which is correctly noticed is

it breaks with cracking sound

a reddish brown gas is evolved

water droplets collect in the cooler parts of the test tube

a dark blue residue is formed.

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