When calcium metal is added to water, the gas evolved does not catch fire, but the same gas evolved on adding potassium metal to water catches fire. Explain why?

Name a metal for the following case:

It does not react with any physical state of water.

Name a metal for the following case:

It does not react with cold as well as hot water but reacts with steam.

Write one example for the following:

Most malleable and ductile metal.

Write one example for the following:

The best conductor of heat and poorest conductor of heat.

Write one example for the following:

Metal with the highest melting point and metal with the lowest melting point.

Give a reason for the following:

We can store copper sulphate solution in a silver vessel but not silver nitrate solution in a copper vessel.

Give a reason for the following:

The reaction of zinc with dilute nitric acid does not produce hydrogen gas.