भूमिजा , वैदेही, रामप्रिया किसके पर्याय हैं?

In addition to hydrogen the other abundant element present on Sunsurface is

When Hydrogen starts burning in air it produces?

The electronic configuration of an atom having atomic number 20 is 

Black lung disease occurs in people working in 

Which mineral is the ore Of aluminium?

A powerful eye irritant present in smog is

Which of the following is used to increase the antiknocking property of petrol?

Mercury is a :

Which type of fire extinguisher is used for petroleum fire?

Which gas is used for converting vegetable oils into saturated fats?