What is the occurrence of Hydrogen?

• Free State

• Combined State

• Both

On Earth, free hydrogen occurs in..

• Very large amounts

• Everywhere

• Very small amounts

Hydrogen is more common in the form of..

• Compounds

• Elements

• Liquids

Now-a-days, hydrogen is widely seen as the mass _____ of the future.

___ process is used to prepare hydrogen

By the electrolysis of water, hydrogen is collected on a..

• Large scale

• Small scale

_____ is a process in which an electric current is passed through an aqueous solution of a compound to bring about a chemical change.

Strong electrolysis ______.

• dissociate almost completely into ions in their aqueous or molten state.

• partly dissociate into ions in their liquid states.

In labs, hydrogen is prepared by the action of..

• dilute hydrochloric acid

• dilute sulfuric acid

• granulated zinc

• nitric acid

• ethanoic acid

A container in which electrolysis takes place