How does the ionisation energy of 1st group elements vary ?
Increases down the group
Decreases down the group
Remains unchanged
Variation is not regular
B.
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 .
The compound insoluble in water is
mercurous nitrate
mercuric nitrate
mercurous chloride
mercurous perchlorate.
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.
