1.

Which out of the following is the correct composition of Crooke's glass?

Answer»

`Na_(2)CO_(3).CaCO_(3).SiO_(2)`
`K_(2)CO_(3).CaCO_(3).SiO_(2)`
`Na_(2)CO_(3).K_(2)CO_(3).PbCO_(3).SiO_(2)`
`K_(2)CO_(3).PbCO_(3).CeO_(2)`. SAND.

Solution :`K_(2)CO_(3).PbCO_(3).CeO_(2)` sand. It cuts harmful U.V. RAYS of SUN.


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