Question

Identify A, B and C.
$\begin{array}{ccc}\text{Air pollutant}& \text{Major Source}& \text{Effect}\\ \text{A}& \text{Refrigerator}& \text{Depletion of ozone layer}\\ \text{Sulphur dioxide}& \text{B}& \text{Irritation of eyes and respiratory tract}\\ \text{Carbon monoxide}& \text{Industrial smoke}& \text{C}\end{array}$

• A. A: Carbon monoxide, B: Burning of coal, C: Increased oxygen carrying capacity of blood
• B. A: CFC, B: Burning of coal, C: Lowered oxygen carrying capacity of blood
• C. A: CFC, B: Pesticides, C: Lung cancer
• D. A: Carbon dioxide, B: Industrial leakage, C: Mental weakness

Answer 1

The correct option is B A: CFC, B: Burning of coal, C: Lowered oxygen carrying capacity of blood

Refrigerator contain CFC as a coolant. When this is released into the atmosphere, it depletes the ozone layer.
Sulphur dioxide is usually released by burning of fossil fuels. Sulphur dioxide causes irritation of eyes, respiratory tract and is also involved in the formation of acid rain.
Carbon monoxide is usually present in industrial smoke. It binds to haemoglobin. This does not allow oxygen to bind to haemoglobin, reducing its capacity.