An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating, it gives NH3 along with a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is
CH3NCO
CH3CONH2
(NH2)2CO
(NH2)2CO
C.
(NH2)2CO
If α is the degree of dissociation of Na2SO4, the vant Hoff’s factor (i) used for calculating the molecular mass is
1 + α
1 - α
1 +2α
1 +2α
Hydrogen bomb is based on the principle of
Nuclear fission
Natural radioactivity
Nuclear fusion
Nuclear fusion
An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be
A2B
AB
AB3
AB3
Lattice energy of an ionic compounds depends upon
Charge on the ion only
Size of the ion only
Packing of ions only
Packing of ions only
The highest electrical conductivity of the following aqueous solutions is of
0.1 M acetic acid
0.1 M chloroacetic acid
0.1 M fluoroacetic acid
0.1 M fluoroacetic acid
Aluminium oxide may be electrolysed at 1000o C to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is
Al3+ +3e- → Alo
To prepare 5.12 kg of aluminium metal by this method would require
5.49 x 107 C of electricity
1.83 x 107 C of electricity
1.49x 107 C of electricity
1.49x 107 C of electricity
Consider an endothermic reaction, X → Y with the activation energies Eb and Ef for the backward and forward reactions, respectively. In general
Eb < Ef
Eb > EfEb > Ef
Eb = Ef
Eb = Ef