Multiple Choice Questionsthe correct order of the oxidation states of nitrogen in NO, N2O, NO2 and N2O3 is
NO2 < NO < N2O3 < N2O
N2O < N2O3 < NO < NO2
N2O < NO < N2O3 < NO2
NO2 < N2O3 < NO < N2O
Consider the van der walls constants, a and b, for the following gases
| Gas | Ar | Ne | Kr | Xe |
| a/ (atm dm6 mol-2) | 1.3 | 0.2 | 5.1 | 4.1 |
| b/ (10-2 dm3 mol-1) | 3.2 | 1.7 | 1.0 | 5.0 |
Which gas is expected to have the highest critical temperature?
Kr
Ar
Ne
Xe
The oxoacid of sulphur that does not contain bond between sulphur atoms is :
H2S2O3
H2S2O7
H2S4O6
H2S2O4
The minimum amount of O2(g) consumed per gram of reactant is for the reaction :
(Given atomic mass : Fe = 56, O=16, Mg=24, P= 31, C=12, H=1)
2Mg(s) + O2(g) → 2MgO (s)
4Fe(s) + 3O2(g) → 2Fe2O3(s)
P4(s) + 5O2(g) → P4O10(s)
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O (l)
The number of pentagons in C60 and trigons (triangles ) in white phosphours, respectively ,are :
20 and 4
20 and 3
12 and 4
12 and 3
