The pH of an aqueous solution of CH3COONa of concentration C(M) is given by
7 - pKa - log C
pKw + pKb + log C
pKw - pKb - log C
pKw + pKa + log C
If the equilibrium constants of the following equilibria,
SO2 + O2 → SO3 and 2SO3 → 2SO2 + O2
are given by K1 and K2 respectively, which of the following realation is correct?
K2 =
K1 =
K2 =
K2 = (K1)2
The energy of an electron in first Bohr orbit of H-atom is -13.6 eV. The possible energy value of electron in the excited state of Li2+ is
-122.4 eV
30.6 eV
-30.6 eV
13.6 eV
The amount of the heat released when 20 mL 0.5 M NaOH is mixed with 100 mL 0.1 M HCl is × kJ. The heat of neutralisation is
-100 x kJ/mol
-50 x kJ/mol
+ 100 x kJ/mol
+50 x kJ/mol
Which one of the following has the lowest ionisation energy?
1s2, 2s2, 2p6
1s2, 2s2, 2p6, 3s1
1s2, 2s2, 2p5
1s2, 2s2, 2p3
2 g of metal carbonate is neutralised completely by 100 mL of 0.1 N HCl. The equivalent weight of metal carbonate is
50
100
150
200
The representation of the ground state electronic configuration of He by box-diagram as is wrong because it violates
Heisenberg's uncertainty principle
Bohr's quantization theory of angular momenta
Pauli exclusion principle
Hund's rule
The electronic transitions from n = 2 to n= 1 will produce shortest wavelength in (where n = principal quantum state)
Li2+
He+
H
H+
In the following electron-dot structure, calculate the formal charge from left to right nitrogen atom;
-1, -1, +1
-1, +1, -1
+1, -1, -1
+1, -1, +1
If the molecular wt. of Na2SO3 and I2 are M1 and M2 respectively then what will be the equivalent weight of Na2SO3 and I2 in the following reaction?
2S2O + I2 → S4O + 2I-
M1, M2
M1, M2 /2
2M1, M2
M1, 2M2