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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

Decreases down the group

Ionization energy of Ist group elements decreases down the group because in groups from top to bottom atomic size increases .Due to increase in atomic size ,the nuclear attraction of outer electron is reduced .They easily removed from valence orbital .So ionization energy is reduced from top to bottom in a group .