The compound insoluble in water is
mercurous nitrate
mercuric nitrate
mercurous chloride
mercurous perchlorate.
C.
mercurous chloride
According to "solubility rule" following compounds are soluble in water:
(i) All common group IA and NH4+ compounds.
(ii) All common NO3- (nitrate), CH3COO-(acetate), ClO4, (perchlorate) compounds.
(iii) All common Cl- , Br- , I- compounds, except those of Ag+, Pb2+,Cu+ and Hg22+(mercurous)
(iv) All common SO42- (sulphate) compounds, except those of Ca2+, Sr2+, Ba2+ and Pb2+.
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.
How does the ionisation energy of 1st group elements vary ?
Increases down the group
Decreases down the group
Remains unchanged
Variation is not regular