Sorel's cement is:

An element reacts with hydrogen to form a compound $A$,which on treatment with water liberates hydrogen gas. The element can be

State whether the following statements are True or False:
$(1)$ Plaster of Paris is used to join fractured bones and keep them immobilized.
$(2)$ Calcium carbonate and soil are the raw materials for cement production.

Which of the following groups of elements have chemical properties that are most similar?

Which of the following metals belong to the same group in the periodic table?

The highest occupied energy level of the group $2$ elements is $7s^2$. Which of these statements is likely to be incorrect?