Burning pyrites ore gives out
1). Carbon dioxide gas
2). Sulphur dioxide gas
3). Nitrogen dioxide gas .
4). Nitric oxide gas:
Wax used for making candle is chemically a mixture of
1). aliphatic hydrocarbons
2). aromatic hydrocarbons
3). cyclic hydrocarbons
4). aliphatic and aromatic hydrocarbons
An atomic dock is based on transitions in
1). Sodium
2). Caesium
3). Magnesium
4). Aluminium
Bauxite is an alloy of which of the following metals ?
1). Aluminium
2). Silver
3). Tin
4). Iron
The chemical bahaviour of an atom depends upon
1). the number of protons in its nucleus
2). the number of neutrons in the nucleus
3). the number of electrons orbiting around the nucleus
4). the number of nucleons in the nucleus