An unknown compound was discovered to have the formula X2O3, where O stands for oxygen. What is the ion charge of the unknown element X?

Explanation:

The valency of element is 3 and formula of its chloride is XCL_3XCL

3

Explanation: The neutral oxide of the element X , X_2O_3X

2

O

3

is formed by the combination of X^{3+}X

3+

and O^{2-}O

2−

. Thus the valency of the element is X as it has lost three electrons to acquire stable noble gas configuration.

Similarly oxygen has gained two electrons to attain stable noble gas configuration and thus has a valency of two.

The chloride of the element X is formed by combination of X^{3+}X

3+

and Cl^{-}Cl

−

and thus to form a neutral compound XCl_3XCl

3

is formed.

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.