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The gas filled in fluorescent tube is ?

Potassium oxides is a _________

The milk of magnesia is used for the treatment of ____.

The brown gas formed when metal reduces HNO3 is.

Tincal is a mineral of

The oxide of Beryllium is ________.

The total number of transitions elements is:

The variable valency is the characteristic of _______?

First transitions series starts with:

The chemical compositions of cinnabar is ____.