Chemical Bonding and Molecular Structure Test

Result

Chemical Bonding and Molecular Structure Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

The solubility of a particular compound depends upon the value of its lattice enthalpy and hydration enthalpy. The lattice and hydration enthalpies of four compounds are given below.

S.No Lattice enthalpy (kJ/mol) Hydration enthalpy (kJ/mol)

P +750 -920

Q +1128 -812

R +827 -877

S 600 -580

The pair of compounds that is soluble in water is

A
P and S

B
Q and P

C
P and R

D
Q and S

Solution

A compound is soluble in water when its hydration enthalpy is greater than its lattice enthalpy.
Question 2
1 / -0

A molecule contains two σ^_- and two π-bonds and one lone pair of electrons in the valence shell of central atom. The arrangement of lone pair as well as bond pairs is

A
square planar

B
trigonal planar

C
linear

D
tetrahedral

Solution

Since there are three sigma bond equivalents, therefore hybridisation should be sp²(lone pair = 1 sigma bond equivalent, and two sigma bonds). So, the structure should be trigonal planar, but bond angle will be a little contracted due to lone pair and bond pair repulsion.
Question 3
1 / -0

The percentage of s-character in the orbital forming P-P bond in molecular phosphorus is

A
25

B
33

C
50

D
75

Solution

The molecular phosphorus exists in P₄form. It has a tetrahedron structure. Each P involves sp³ hybridisation orbital. Hence, its s-character will be 25% and p-character is 75%.