" Write the names of the main gases in the air,"

Write the name of the main constituent of biogas. Also state its percentage.

What is the other name of main vein ?

Write the name and chemical formula of the main product formed by heating baking soda.

Write the names and formulate of main ores of Fe , Cu , Al and Zn .

(a) Write down the name of world most problematic aquatic weed palnt. (b) Write down the name of major green house gases

A white powder is added while baking breads and cakes to make them soft and fluffy. Write the name of the powder. Name its main ingredients.

Write the name and formula of main ores of Fe, Cu,Al and Zn.

Name the gases found in atmosphere.

Name a metal of medium reactivity and write three main steps in the extraction of this metal from its sulphide ore.

Brass gets discoloured in air because of the presence of which of the following gases in air?