8. Which of the following is a polar molecule? (1) Para dichlorobenzene (2) Carbon tetrachloride (3) Tetrachloroethene (4) HO OH

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Q. Which of the following are polar molecular solids?
Solid sulphur dioxide, solid ammonia, iodine crystals, graphite, carbon tetrachloride.

Explain the following briefly:
(a) Sodium chloride dissolves in water but carbon tetrachloride is insoluble in water.
(b) Helium does not form He₂ molecule.
(c) Pure water does not conduct electricity, but on adding sodium chloride to it, it starts conducting electricity.
(d) Cl₂ is a non-polar molecule, while HCl is a polar molecule.
(e) Metals are electropositive.

Q. Assertion :In water carbon tetrachloride (

C C l_{4}

) is not soluble.
Reason: Polar bonds and an asymmetric shape are properties of water molecules.

Which of the following is the correct representation of carbon tetrachloride( $C C l_{4}$ )?

Q. Q. Which of the following are Ozone Depleting Substances (ODS)?Select the correct answer using the code given below.

1 and 3 only
2 and 4 only
1, 2, 3 and 4
1, 2 and 4 only

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