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Chemistry Questions and Answers

Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.

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1,211.

Which of the following gases has the lowest rate of diffusion under the same condition? [H = 1.00; He = 4. 00; O = 16.0; CI = 35.5]

CI₂

H₂

O₂

View answer & explanation

Correct answer is A

According to Graham's law of diffusion and effusion,

r $\propto$ $\sqrt{\frac{1}{M}}$ .

Therefore, the more the molar mass, the less the rate of diffusion and effusion.

1,212.

The postulate that molecules are in constant random motion best explains why liquids

can undergo solidification

maintain their volumes

are incompressible

have no characteristic shape

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,213.

At ordinary temperature H $_2$ O is a liquid while H $_2$ S is a gas. This is because H $_2$ O has

weak intermolecular forces holding its molecules together

strong hydrogen bonds holding its molecules together

induced dipole-induced dipole forces between its molecules

ionic force between its molecules

View answer & explanation

Correct answer is B

H $_2$ O has stronger intermolecular dipole--dipole interaction because of the greater polarity (or a hydrogen bond). Because of the stronger intermolecular interaction H $_2$ O is more stable and exists as a liquid.