Choose the correct order respectively as T (True) and F (False) for the following statements given:
(1) When the pH of rain water is below 3.6, it is called acid rain.
(2) Ozone hole occurs over Antarctica mainly during September—October and it gets replenished in November—December.
(3) Methylcyclohexane is an ozone-depleting molecule.
(4) COD is always larger than BOD.

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TTTF

FTFT

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FTTT

answer is B.

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Detailed Solution

(1) When the pH of rain water is below 5.6, it is called acid rain.

(2) Ozone hole occurs over Antarctica mainly during September—October and it gets replenished in November—December.

(3) Methylcyclohexane is not an ozone-depleting molecule.

(4) BOD (Biological oxygen demand) is a measure of organic pollutant present in the sample of water. Higher is the value of BOD, higher is the level of organic pollution in water. The amount of oxygen (in mg/L) consumed for oxidising all organic and oxidisable inorganic material in a sample of water is called chemical oxygen demand (COD). COD is always larger than BOD.

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