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 |
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 |
Which sequence of the following, in terms of boiling point, is correct?
1.
2.
3.
4.
Which of the following statements is false?
1. | Xe is the most reactive among the rare gases. |
2. | He is an inert gas. |
3. | Radon is obtained from the decay of radium. |
4. | The most abundant rare gas found in the atmosphere is He. |
An element belongs to group 15 and 3rd period of the periodic table. Its electronic configuration would be:
1. \(\mathrm{1 s^2 2 s^2 2 p^4}
\)
2. \(\mathrm{1 s^2 2 s^2 2 p^3}
\)
3. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^2}
\)
4. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^3}\)
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
Which of the following gases is the easiest to liquefy?
1. | Ar | 2. | Ne |
3. | Xe | 4. | Kr |
Which of the following compounds is not an acidic salt?
1. NaH2PO2
2. NaH2PO3
3. Na2H2S2O7
4. NaH2PO4