Incorrect order among the following is:
1. | F2 > Cl2 > Br2 > I2 | Oxidising power |
2. | F < Cl > Br > I | Electron gain enthalpy |
3. | F2 > Cl2 > Br2 > I2 | Bond dissociation energy |
4. | F> Cl > Br > I | Electronegativity |
The respective oxidation states of P in H4P2O5, H4P2O6, and H4P2O7 are:
1. | +3, +5, and +4 | 2. | +5, +3, and +4 |
3. | +5, +4, and +3 | 4. | +3, +4, and +5 |
A solid (A) reacts with strong aqueous NaOH, liberating a foul smelling gas (B), which spontaneously burns in the air, giving smoky rings. A and B are, respectively:
1. P4 (red) and PH3
2. P4 (white) and PH3
3. S8 and H2S
4. P4 (white) and H2S
The number of \(\mathrm{S=O}\) bonds present in \(\mathrm{H}_2\mathrm{S}_2 \mathrm{O}_8\) is:
1. | 1 | 2. | 2 |
3. | 3 | 4. | 4 |
A balanced chemical equation for the reaction showing catalytic oxidation of NH3 by atmospheric oxygen is:
1. | 4NH3 + \(\underset{\text{From air}}{5O_2} \) \(\xrightarrow[\text{500 K; 9 bar}]{\text{Pt / Rh gauge catalyst}}\) 4NO + 6H2O |
2. | 3NH4 + \(\underset{\text{From air}}{5O_2} \) \(\xrightarrow[\text{500 K; 9 bar}]{\text{Pt / Rh gauge catalyst}}\) 3NO + 6H2O |
3. | 4NH3 + \(\underset{\text{From air}}{5O_2} \) \(\xrightarrow[\text{cold}]{\text{no catalyst}}\) 4NO + 6H2O |
4. | 3NH4 + \(\underset{\text{From air}}{5O_2} \) \(\xrightarrow[\text{cold}]{\text{no catalyst}}\) 3NO + 6H2O |
The correct structure of pyrophosphoric acid is:
1. | 2. | ||
3. | 4. |
PH3 forms bubbles when passed slowly through water but NH3 gets dissolved in water, because:
1. | NH3 forms an H-bond with water, so it is soluble but PH3 does not form an H-bond. |
2. | NH3 does not form an H-bond with water, so it is soluble but PH3 does form an H-bond. |
3. | NH3 and PH3 both form H-bond with water. |
4. | NH3 and PH3 both do not form H-bond with water. |
The disproportionation reaction of is as follows:
X and Y in the above reaction are:
1. H3PO2, HPO2
2. H3PO4, PH3
3. H2PO6, PO3
4. None of the above.
The compound among the following with the lowest pKa value is?
1. H2O
2. H2S
3. H2Se
4. H2Te
Nitrogen gas is liberated by the thermal decomposition of:
1.
2.
3.
4. All of the above.