______ is the general name for a class of bacteria that

A storm is predicted if atmospheric pressure –

Activated charcoal is used to remove colouring matter from pure substances by which of the following process?

The sudden fall of atmospheric pressure indicates –

Bleaching powder is represented as ______.

The conversion of hard water into soft water by boiling or adding calcium hydroxide is called:

Who measured the velocity of light first?

In a compound, the elements are always present in definite proportions by:

In nuclear reactor, heavy water is used as –

Which of the following does not give effervescence with sodium carbonate?

Which of the following has the lowest ionization enthalpy?