Multiple Choice QuestionsThe set representing the correct order of ionic radius is
Li+ > Be2+ > Na+ > Mg2+
Na+ > Li+ > Mg2+ > Be2+
Li+ > Na+ > Mg2+ > Be2+
Mg2+ > Be2+ > Li+ > Na+
NaOH is a strong base. What will the be pH of 5.0 × 10-2 M NaOH solution? (log 2 = 0.3)
14.00
13.70
13.00
12.70
The enthalpy of combustion for the H2, cyclohexene and cyclohexane are -241, -3800 and -3920 kJ mol-1 respectively. Heat of hydrogenation of cyclohexene is
121 kJ mol-1
-121 kJ mol-1
242 kJ mol-1
-242 kJ mol-1
The value of Kc for the dissociation reaction, H2 (g) 2H (g) is 1.2 × 10-42
This equilibrium mixture contains mainly
H2 (g)
H (g) atom
1.1 M mixture of H2 and H
1.2 M mixture of H2 and H
Ksp of CaSO4 is 4 × 10-12. CaSO4 is precipitated on mixing equal volumes of the following solutions.
3 × 10-10 M CaCl2 and 3 × 10-6 M (NH4)2SO4
4 × 10-6 M CaCl2 and 3 × 10-6 M (NH4)2SO4
6 × 10-6 M CaCl2 and 3 × 10-16 M (NH4)2SO4
In all the above cases
Which of the following is the correct decreasing order of oxidation state of nitrogen?
HNO3 > NO > NH4Cl > N2
HNO3 > NO > N2 > NH4Cl
HNO3 > NH4Cl > NO > N2
NO > HNO3 > NH4Cl > N2
Which of the following has highest electron affinity?
N
O
F
Cl
D.
Cl
The electron affinities of some of the elements of second period ( i.e. N, O, F, etc) are however, lower than the corresponding elements ( i.e P, S, Cl, etc) of the third period. This is due to the reason that the elements of second period have the smallest atomic sizes amongst the elements in their respective groups. As a result, there are considerable electron-electron repulsion with the atom itself and hence, the additional electron is not accepted with the same case as compared to the remaining elements in the same group.
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