Chemistry

1.The gas used for artificial ripening of green fruit is

ethylene ethane carbon dioxide acetylene

2.Zone refining is used for the purification of

Au Ge Ag Cu

3.The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

cineole engenol geraniol limonene

4.The high reactivity of fluorine is due to

its high electro negativity small size of fluorine atom availability of d-orbitals strong F - F bond

5.The major constituent of air is

nitrogen carbon dioxide oxygen hydrogen