Sawaal
27
Q:

An element which is preserved under water is 

A) sodium B) sulphur
C) red phosphorus D) white phosphorus

Answer:   D) white phosphorus



Explanation:

White phosphorus undergoes spontaneous combustion when exposed to air. In order to prevent this spontaneous ignition, it is preserved under water. 

Subject: Chemistry
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The percentage of nitrogen in the air is about

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Air ___________________ are the substances which contaminate the air.

A) Reactants B) Irritants
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Answer & Explanation Answer: D) Pollutants

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By using which foam the Researchers from Indian Institute of Technology – Bombay have made a low cost piezo resistive vibration sensor?

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