NDA || Science || Chemistry Quiz

Temporary hardness in water is due to which one of the following of Calcium and Magnesium?

Molecules of which of the following has cage like structure?

1) Diamond

2) Graphite

3) Fullerenes

Select the correct answer using the code given below:

Match List I with List II and select the correct answer using the code given below the Lists:

List I (Noble gas)

A. Argon

B. Neon

C. Krypton

D. Xenon

List II (Use)

1) In lights for advertising display

2) Airport landing lights and in light houses

3) Light in photographer’s flash gun

4) In tungsten filament to last longer

The valency of an element depends upon the

Stung by hairs of nettle leaves causes burning pain. This is due to the injection of