Which of the following is not a greenhouse gas?

Identify the wrong statement among the following:

Identify the correct statements from the following:
$a$) $BOD$ value of clean water is less than $5 \ ppm$
$b$) Oxidation of ethene in the presence of $Pd^{2+}$ catalyst in aqueous medium gives acetic acid
$c$) Photochemical smog causes damage to plant life
$d$) Reducing smog is a mixture of smoke,fog and $SO_2$

The depletion of the ozone layer in the stratosphere is responsible for which of the following?

Mention the types of pollution.

Explain the effects of acid rain on the Taj Mahal.