Valency

What is the valency of underlined element in the given compounds?
$\left(\mathrm{i}\right) \underline{{\mathrm{Ca}}_3}{\mathrm{N}}_2 \left(\mathrm{ii}\right) \underline{\mathrm{Zn}}\mathrm{SO}4 \left(\mathrm{iii}\right) \underline{\mathrm{C}}{\mathrm{Cl}}_4$. 

An element Z has a valency of $3$. What is the formula of oxide of Z?

An element 'Y' shows variable valencies of $3$ and $5$. Write the formulae of its oxides.

What is the combining capacity of an element called?

The valency of iron in ${\mathrm{Fe}}_2{\mathrm{O}}_3$ is
 

Valency of copper in ${\mathrm{Cu}}_2{\mathrm{Cl}}_2$ and ${\mathrm{CuCl}}_2$ are respectively

Some compounds along with their chemical formulae are given below.

On the basis of formulae given above, the valencies or charges on ions are given below. Select the incorrect option.

The formula of oxide of an element Z is ${\mathrm{Z}}_2{\mathrm{O}}_3$. What is the valency of element Z and oxygen?

An element 'X' has a valency 1. Is element 'X' a metal or a non-metal?

An element 'X' has valency 1. Write the chemical formula of its chloride.

An element 'X' has a valency 1. Write the chemical formula of its phosphide.

Write the covalency of nitrogen in ${\mathrm{N}}_2{\mathrm{O}}_5$.

Write the valency of nitrogen in ${\mathrm{N}}_2{\mathrm{O}}_3$.

Write the valency of fluorine in ${\mathrm{CaF}}_2$.

Write the valency of sulphur in ${\mathrm{SF}}_6$.

Write the valency of phosphorus in ${\mathrm{PH}}_3$.

Write the valency of carbon in ${\mathrm{CH}}_4$.

How are the elements with variable valency named?

Write the name of two elements, which show variable valency.

An element has Z =$11$, what is the valency of the element? Also, name the element.