Write true or false for the following statement:
Acids that give rise to more $H^+$ ions are said to be strong acids,and acids that give less $H^+$ ions are said to be weak acids.

State the number of water molecules present in crystals of washing soda and Plaster of Paris. What are these water molecules called?

Which of the following is(are) true when $HCl(g)$ is passed through water?
$(i)$ It does not ionise in the solution as it is a covalent compound.
$(ii)$ It ionises in the solution.
$(iii)$ It gives both hydrogen and hydroxyl ion in the solution.
$(iv)$ It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule.

Which of the following metals reacts with sodium hydroxide to produce a salt and $H_2$ gas?

Which of the following is a weak acid?

How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?