The variation of the boiling point of the hydrogen halides is in the order HF > HI > HBr > HCl.
The higher boiling point of hydrogen fluoride is explained as:
1. | The electronegativity of flourine is much higher than other elements in group |
2. | There is strong hydrogen bonding between HF molecules |
3. | The bond energy of HF molecules is greater than in other hydrogen halides |
4. | The effect of nuclear shielding is much reduced in flourine which polarizes the HF molecule |
The strong reducing behaviour of H3PO2 is due to:
1. Presence of one -OH group and two P-H bonds.
2. High electron gain enthalpy of phosphorus.
3. High oxidation state of phosphorus.
4. Presence of two -OH groups and one P-H bond.
The acidity of diprotic acids in aqueous solution increases in the order:
1. H2S < H2Se < H2Te
2. H2Se < H2S < H2Te
3. H2Te < H2S < H2Se
4. H2Se < H2Te < H2S
Which of the following compounds does not release oxygen when heated?
1. Zn(ClO3)2
2. K2Cr2O7
3. (NH4)2Cr2O7
4. KClO3
The incorrect statement regarding oxoacids of phosphorus is:
1. | Orthophosphoric acid is used in the manufacture of triple superphosphate. |
2. | Hypophosphorous acid is a diprotic acid. |
3. | All oxoacids contain tetrahedral four coordinated phosphorus. |
4. | All oxoacids contain at least one P=O unit and one P-OH group. |
Sulphur trioxide can be obtained by which of the following reaction:
1.
2.
3.
4.
Which of the following compounds has the lowest melting point?
1.
2.
3.
4.
Oxidation states of P in H4P2O5, H4P2O6, H4P2O7, are respectively:
1. | +3, +5, +4 | 2. | +5, +3, +4 |
3. | +5, +4, +3 | 4. | +3, +4, +5 |
Among the following which is the strongest oxidising agent?
1.
2.
3.
4.