Bleaching action of chlorine is by________?

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The horizontal rows of the periodic table are called ______?

A. Groups B. Periods C. Sets D. Matrices...

In which layer of atmosphere does commercial aircrafts usually fly?

A. Stratosphere B. Troposphere C. Mesosphere D. Thermosphere...

The density of Air is_____________?

A. 0.225 kg/m3 B. 1.025 kg/m3 C. 1.225 kg/m3 D. 1.425 kg/m3...

The type of glass used in making lenses and prism is___________?

A. Pyrex glass B. jena glass C. Flintglass D. Soft glass...

The ability of the Eye to see in the dark, is due to the production of a purple pigment known as________?

A. Carotene B. Rhodopsin C. Iodopsin D. Retinene...