Name: Laws of Chemical Combinations
Uploaded: 2019-07-19
Duration: 1 min 51 s
Description: The laws of chemical combinations describe the basic principles obeyed by interacting atoms and molecules. Let's study the different laws in detail.

Question

An element X forms the following compounds with hydrogen, carbon, and oxygen: $H_{2} X, {CX}_{2}, {XO}_{2}, {XO}_{3}$ _.State the three valencies of element $X$ which are illustrated by these compounds.

Accepted Answer

i) In the compound $H_{2} S$ , $X$ is combined with hydrogen,

The valency of one atom of hydrogen = $1$

So, valency of two atoms of hydrogen = $2 \times 1 = 2$ ,

Now, in the compound $H_{2} X$ the valency of $X$ should be equal to the total valency of $H$ . There is one atom of $X$ in the compound hence, the valency of $X$ should be $2$ .

ii) In the compound ${CX}_{2}$ , $X$ is combined with carbon,

The valency of one atom of carbon = $4$ , and the compound has one carbon in it.

Now, in the compound ${CX}_{2}$ the valency of $X$ should be equal to the total valency of $C$ i.e., $4$ . There are two atoms of $X$ in the compound, therefore, the valency of $X$ should be half of the valency of $C$ , which is $2$ .

iii) In the compound ${XO}_{2}$ , $X$ is combined with two atoms of oxygen,

The valency of one atom of oxygen = $2$

Valency of two $O$ atom= $2 \times 2 = 4$

Now, in the compound ${XO}_{2}$ the valency of $X$ should be equal to the total valency of $O$ ie., $4$ . therefore the valency of $X$ should be $4$ .

iv)In the compound ${XO}_{3}$ , $X$ is combined with three atoms of oxygen,

The valency of one atom of oxygen = $2$

Valency of three $O$ atom= $2 \times 3 = 6$

Now, in the compound ${XO}_{3}$ the valency of $X$ should be equal to the total valency of $O$ ie., $6$ . therefore the valency of $X$ should be $6$ .

An element X forms the following compounds with hydrogen, carbon, and oxygen: $H_{2} X, {CX}_{2}, {XO}_{2}, {XO}_{3}$ _.State the three valencies of element $X$ which are illustrated by these compounds.

Important Questions on Atoms and Molecules

Learn and Prepare for any exam you want !

An element X forms the following compounds with hydrogen, carbon, and oxygen: H2X, CX2, XO2, XO3. State the three valencies of element X which are illustrated by these compounds.

Important Questions on Atoms and Molecules

Learn and Prepare for any exam you want !

An element X forms the following compounds with hydrogen, carbon, and oxygen: $H_{2} X, {CX}_{2}, {XO}_{2}, {XO}_{3}$ _.State the three valencies of element $X$ which are illustrated by these compounds.