Determine the oxidation number of chlorine in each of the following substances:
a. kclo3
b. cl2
c. ca(clo4)2
d. cl2o

Answer : The oxidation number of chlorine in are, respectively.

Explanation :

Oxidation number : It represent the number of electrons lost or gained by the atoms of an element in a compound.

Oxidation numbers are generally written with sign (+ and -) first and then the magnitude.

Rules for Oxidation Numbers :

Now we have to calculate the oxidation number of chlorine (Cl) in each of the following substances.

(a)

Let the oxidation state of Cl be, 'x'

Thus, the oxidation state of Cl is, (+5)

(b)

The oxidation number of a free element is always zero.

Thus, the oxidation state of Cl is, (0)

(c)

Let the oxidation state of Cl be, 'x'

Thus, the oxidation state of Cl is, (+7)

(d)

Let the oxidation state of Cl be, 'x'

Thus, the oxidation state of Cl is, (+1)

Therefore, the oxidation number of chlorine in are, respectively.

the answer is option a.