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Classification of Elements and Periodicity in Properties

Multiple Choice Questions

301.

Dominance of strong repulsive forces among the molecules of the gas (Z = compressibility factor)

depends on Z and indicated by Z = 1
depends on Z and indicated by Z > 1
depends on Z and indicated by Z < 1
is independent of Z.

302.

Which of the following elements never show positive oxidation number ?

303.

Which of the following element is a metalloid ?

304.

The first ionisation potential is maximum for :

305.

Which among the following elements have lowest value of IE₁ ?

306.

How does the ionisation energy of 1st group elements vary ?

Increases down the group
Decreases down the group
Remains unchanged
Variation is not regular

307.

Hydrogen in respect to chlorine, is :

electropositive
electronegative
neutral
none of the above

308.

Which of the follownig elements, is most electronegative ?

309.
The liquefied metal expanding on solidification is

Ga

Al

Zn

Cu.

Gallium is brittle at low temperature but is liquid above room temperature and can indeed melt in the hand. Gallium metal expands by 3.1 percent when it solidifies, and therefore should not be stored in either glass or metal containers. Gallium also corrodes most other metals by diffusing into their metal lattice.