Fluorine reacts with dilute NaOH and forms a gaseous product A. The bond angle in the molecule of A is
104°40'
103°
107°
109°28'
The number of p-d 'pi' bonds present in XeO3 and XeO4 molecules, respectively are-
3, 4
4, 2
2, 3
3, 2
The wavelengths of electron waves in two orbits is 3 : 5. The ratio of kinetic energy of electrons will be
25 : 9
5 : 3
9 : 25
3 : 5
Which one of the following sets correctly represents the increase in the paramagnetic property of the ions?
Cu2+ > V2+ > Cr2+ > Mn2+
Cu2+ < Cr2+ < V2+ < Mn2+
Cu2+ < V2+ < Cr2+ < Mn2+
V2+ < Cu2+ < Cr2+ < Mn2+
Dipole moment of HCl = 1.03 D, HI= 0.38 D. Bond length of HCl = 1.3 Å and HI = 1.6 Å. The ratio of fraction of electric charge, δ, existing on each atom in HCl and HI is
12 : 1
2.7 : 1
3.3 : 1
1 : 3.3
1.5 g of CdCl2 was found to contain 0.9 g of Cd. Calculate the atomic weight of Cd.
118
112
106.5
53.25
The average kinetic energy of one molecule of an ideal gas at 27°C and 1 atm pressure is
900 cal K-1 mol-1
6.21 × 10-21 JK-1 molecule-1
336.7 JK-1 molecule-1
3741.3 JK-1 mol-1
pH of a buffer solution decreases by 0.02 units when 0.12 g of acetic acid is added to 250 mL of a buffer solution of acetic acid and potassium acetate at 27°C. The buffer capacity of the solution is
0.1
10
1
0.4
Which one of the following order is correct for the first ionisation energies of the elements?
B < Be < N < O
Be < B < N < O
B < Be < O < N
B < O < Be < N