Select the sequence of True (T) and False (F) for the following statements:
(1) Rainwater is termed acid rain when its pH falls below 3.6.
(2) The ozone hole over Antarctica is most pronounced during September–October and is restored during November–December.
(3) Methylcyclohexane is a sub

Question

Select the sequence of True (T) and False (F) for the following statements:
(1) Rainwater is termed acid rain when its pH falls below 3.6.
(2) The ozone hole over Antarctica is most pronounced during September–October and is restored during November–December.
(3) Methylcyclohexane is a substance that depletes ozone.
(4) Chemical oxygen demand (COD) is always greater than biological oxygen demand (BOD).

Accepted Answer

FTFT. The correct option is right because statement (1) is false; acid rain is typically defined as rain with a pH below 5.6. Statement (2) is true as the ozone hole is indeed most pronounced during September–October. Statement (3) is false because methylcyclohexane does not deplete ozone; it is not an ozone-depleting substance. Statement (4) is true since COD is generally higher than BOD due to the inclusion of both biodegradable and non-biodegradable organic matter.

Solution

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