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Oxygen and ozone are _______.
Tritium is an isotopes of_______.
Which of the following elements is not radio-active?
Tartaric acid is obtained from _____.
Blue litmus paper is converted into red in solution of ______.
Cement does not contain ______.
Which hydrocarbon is mainly present in gobar gas?
The compound of a metal found in nature is called _____.
Heating of a ore below its melting point in the absence of air is known as ______.
Aluminium oxide is a/an _____.
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