What are the constituent elements of brass?

Name any one metal which reacts neither with cold water nor with hot water but reacts with heated steam to produce hydrogen gas.

$A$ metal $M$ forms an oxide having the formula $M_{2}O_{3}$. It dissolves in both dilute sulphuric acid and dilute sodium hydroxide solution. Identify the metal and write the chemical equations for the reactions involved.

State whether the following statement is true or false:
Copper does not burn in air, but the hot metal is coated with a black-coloured layer of copper $(II)$ oxide.

Malachite is an ore of which metal?

Which non-metal element is used in the vulcanization of rubber?