Question

Question 29:
Which one of the pollutant(s) mentioned above contains three atoms?
1. C6H6
11.O3
111.NO2
iv. NO
a) i and ii
b) ii and iii
c) iii and iv
d) ii and iv
​

Answer 1

$\LARGE{ \underline{ \purple{ \sf{Required \: answer:}}}}$

Atoms are the smallest unit of an chemical element that exist. Molecules are group of atoms that forms the smallest unit of a compound.

Let's consider that the above are the molecules of their respective compounds or pollutants since they cause pollution in the environment.

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So, Let's identify the no. of atoms in the molecule.

1) C6H6

• No. of atoms = 6 + 6 = 12

2) O3

• No. of atoms = 3

3) NO2

• No. of atoms = 1 + 2 = 3

4) NO

• No. of atoms = 1 + 1 = 2

According to question, the molecules having three atoms are O3 and NO2. Hence the correct option is (ii) and (iii).

$\large{ \therefore{ \boxed{ \sf{Option \: (B)}}}}$

Answer 2

$\LARGE\sf \underline\green{Required \: Answer:-}$

Let's count Number of Atoms in each option, so that we can get solution.

(i) C6H6.

• No.of Atoms: 6 + 6 = 12.

(ii) O3.

• No.of atoms: 0 + 3 = 3.

(iii) NO2.

• No.of atoms: 1 + 2 = 3.

(iv) NO.

• No.of atoms: 1 + 1 = 2.

By considering given Question, We got pollutants containing 3 atoms from given options.

→ O3 and NO2 are containing 3 atoms.

Hence, Option [(B) ii and iii] is correct.