The number of antibonding electron pairs in O molecular ion on the basis of molecular orbital theory is (Atomic number of O is 18)
5
4
3
2
Hydroxyl ion concentration of 10-2 M HCl is
1 × 101 mol dm-3
1 × 10-12 mol dm-3
1 × 10-1 mol dm-3
1 × 10-14 mol dm-3
The electronic configuration of Cr3+ is
[Ar] 3d4 4s2
[Ar] 3d3 4s0
[Ar] 3d2 4s1
[Ar] 3d5 4s1
B.
[Ar] 3d3 4s0
Cr (24) = [Ar] 3d5 4s1
Cr3+ = [Ar] 3d3 4s0
What is the equivalent weight of SnCl2 in the following reaction?
SnCl2 + Cl2 → SnCl4
95
45
60
30
Which one of the following salts on being dissolved in water gives pH > 7 at 25°C?
KCN
KNO3
NH4Cl
NH4CN
The volume of 10 N and 4 N HCl required to make 1 L of 7 N HCl are
0.50 L of 10 N HCl and 0.50 L of 4 N HCl
0.60 L of 10 N HCl and 0.40 L of 4 N HCl
0.80 L of 10 N HCl and 0.20 L of 4 N HCl
0.75 L of 10 N HCl and 0.25 L of 4 N HCl