Unit - 7.1 Methods for the preparation of Hydrogen — CHEMISTRY STD 8 — Question

Winnowing is the method used to separate

Which one of the following proposed atomic theory of matter?

The process due to which a solid directly changes into gaseous state on heating, without changing first into the liquid state, and the gaseous state on cooling directly changes into solid state, without changing first into the liquid state, is called

Graphite is used as a lubricant because it is:

Chemical formula is the symbolic representation of actual number of atoms present in one _______________of a substance.

In which of the following formation of substances need energy change necessarily ?

Symbol represents the short form of a/an

Choose the correct alternative Destructive distillation of coal yields

There are large intermolecular gaps in