The concentration of fluoride,lead,nitrate and iron in a water sample from an underground lake was found to be $1000 \ ppb, 40 \ ppb, 100 \ ppm$ and $0.2 \ ppm,$ respectively. This water is unsuitable for drinking due to high concentration of:

The non-biodegradable waste formed in fertilizer industries is

Provide the correct statement for the following: (Use $T$ for True and $F$ for False statements.) $(1)$ Plants obtain elements like carbon,hydrogen,and oxygen from air and water. $(2)$ Plants obtain elements like $N, P, K, Ca$ from the soil. $(3)$ Compound fertilizers contain nitrogen as ammonium nitrate,phosphorus as $PCl_3$,and potassium as $KO_2$. $(4)$ The use of $NPK$ fertilizers increases the production of crops and vegetables in the soil.

Which of the following causes "blue baby syndrome"?

Which of the following industries is the best source of increasing $CO$ levels in the atmosphere?

Match the activities given in List-$I$ with the pollution produced in List-$II$.

List-$I$	List-$II$
$(A)$ Burning sulfur-containing waste releases gases into the atmosphere.	$(1)$ Water pollution
$(B)$ Use of carbonates as pesticides	$(2)$ Photochemical smog,damage to plant life,corrosion of buildings,respiratory problems,water pollution.
$(C)$ Using synthetic detergents for washing clothes	$(3)$ Damage to the ozone layer
$(D)$ Releasing smoke from vehicles and factories into the atmosphere.	$(4)$ Neurological disorders in humans.
$(E)$ Using chlorofluorocarbon compounds to clean computer parts.	$(5)$ Classical smog,acid rain,water pollution,respiratory problems,damage to buildings,metal corrosion.