Chemistry Questions & Answers - Free Online Practice

666.

On which of the following is the solubility of a gaseous substance dependent?
I. Nature of solvent
II. Nature of solute
III. Temperature
IV. Pressure

I, II, III and IV

I and II only

II only

III and IV only

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Correct answer is D

The solubility of a gas decreases with an increase in temperature and a decrease in pressure.

667.

A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that

collisions are perfectly elastic

forces of repulsion exist

forces of repulsion and attraction are in equilibrium

collisions are inelastic

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Correct answer is A

According to one of the kinetic theories of gases, When collisions occur, the molecules lose no kinetic energy; that is, the collisions are said to be perfectly elastic.

668.

A correct electrochemical series can be obtained from Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging

Al and Mg

Zn and Fe

Zn and Pb

Pb and H

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Correct answer is A

No explanation has been provided for this answer.

669.

The Consecutive members of an alkane homologous series differ by

CH $_2$

CH $_3$

C $_n$ H $_n$

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Correct answer is B

No explanation has been provided for this answer.

670.

According to the Kinetic Theory an increase in temperature causes the kinetic energy of particles to

decrease

increase

be zero

remain constant

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Correct answer is B

According to the kinetic theory of gases, when a substance is heated, the average kinetic energy of its molecules increases and this leads to a rise in temperature.