Question

The electronic configurations of six elements, U, V,W, X, Y and Z are as follows.

Elements	Electronic configuration
U	2, 8, 1
V	2, 8
W	2, 8, 7
X	2, 8, 2
Y	2, 6
Z	2, 8, 8, 2

Which of the following is incorrect statement?

• A. Element V does not react with U, W, X, Y and Z
• B. Compounds UW, ZY, $U_{2}Y$ show high melting and
  boiling points
• C. Compounds $X{W}_2$, XY and $Z{W}_2$ are insoluble in
  water but soluble in kerosene.
• D. Compounds UW and $U_{2}Y$ do not conduct electricity
  in solid state.

Answer 1

Answer: (C)

Compounds $X{W}_2$, XY and $Z{W}_2$ are insoluble in

water but soluble in kerosene.
From configuration it can be seen that,
compounds $X{W}_2$, XY and $Z{W}_2$ are ionic polar compounds so they are soluble in water (polar solvent) but insoluble in kerosene.