Which alloy is composed of copper and zinc?

What is the molecular formula of sodium aluminate?

What will happen when:
$(i)$ Magnesium is treated with very dilute nitric acid?
$(ii)$ Steam is passed over red hot iron?

An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:

Explain why calcium metal starts floating on the surface of water after reacting with it. Write the chemical equation for the reaction.

Why does a magnesium ribbon start floating when it is placed in hot water?