Q. No.
| Assertion (A): | Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. |
| Reason (R): | The reaction between nitrogen and oxygen requires a high temperature. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :
1. N2O and NO2
2. NO2 and NO
3. NO and N2O
4. NO2 and N2O
The pair in which phosphorous atoms have a oxidation state of +3 is :
1. Orthophosphorous and pyrophosphorous acids
2. Pyrophosphorous and hypophosphoric acids
3. Orthophosphorous and hypophosphoric acids
4. Pyrophosphorous and pyrophosphoric acids
Which of the following has a maximum number of lone pairs associated with Xe?
| 1. | XeF4 | 2. | XeF6 |
| 3. | XeF2 | 4. | XeO3 |
In which of the following arrangements, the sequence is not strictly according to the property written against it?
| 1. | CO2 < SiO2 < SnO2 < PbO2: increasing oxidising power |
| 2. | HF < HCl < HBr < HI : increasing acid strength |
| 3. | NH3 < PH3 < AsH3 < SbH3 : increasing basic strength |
| 4. | B < C < O < N : increasing first ionization enthalpy |
Which of the following reactions of xenon is not feasible?
1. XeO3 + 6HF → XeF6 + 3H2O
2. 3XeF4 + 6H2O → 2Xe + XeO3 +12HF +1.5 O2
3. 2XeF2 + 2H2O → 2Xe + 4HF + O2
4. XeF6 + RbF → Rb[XeF7]
The structure of IF7 is :
1. Square pyramidal
2. Trigonal bipyramidal
3. Octahedral
4. Pentagonal bipyramidal
Choose the incorrect statement among the following statements regarding the sulphur.
| 1. | S2 molecule is paramagnetic. |
| 2. | The vapour sulphur partly exists as S2 molecule. |
| 3. | In cyclo-S6 , the ring adopts the chair form. |
| 4. | The oxidation state of sulphur is never less than +4 in its compounds. |
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