Fill in the blanks:
$(1)$ Hydrocarbon compounds are made from ........ and ........ .
$(2)$ ........ has a capacity to stop the flow of oxygen.
$(3)$ ........ is formed by attaching carbon monoxide with hemoglobin in blood.

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(N/A) $(1)$ Hydrogen and carbon.
$(2)$ Carbon monoxide $(CO)$.
$(3)$ Carboxyhemoglobin.

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$A$ water sample has $ppm$ level concentration of following anions: $F^{-} = 10 \ ppm$,$SO_4^{2-} = 100 \ ppm$,$NO_3^{-} = 50 \ ppm$. The anion/anions that make the water sample unsuitable for drinking is/are:

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Match the following List-$I$ ($F^-$ ion concentration in drinking water) with List-$II$ (Effects on humans):
List-$I$List-$II$
$(A)$ $< 1 \ ppm$$(i)$ Harmful to bones
$(B)$ $> 2 \ ppm$$(ii)$ Tooth decay
$(C)$ $> 10 \ ppm$$(iii)$ Brown mottling of teeth

Then the correct match is:

The chemical substance of photochemical smog responsible for eye irritation is

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