Q. No.Identify the incorrect statement regarding the halogens.
1. All form monobasic oxyacids.
2. All are oxidizing agents.
3. All but fluorine show positive oxidation states.
4. Chlorine has the highest electron-gain enthalpy.
2. All are oxidizing agents.
3. All but fluorine show positive oxidation states.
4. Chlorine has the highest electron-gain enthalpy.
In the structure of ClF3, the number of lone pairs of electrons on central atom 'Cl' is:
1. 1
2. 2
3. 3
4. 4
Match the compounds given in Column I with the shape given in Column II and mark the correct option.
| Column I | Column II | ||
| A. | XeF6 | 1. | Distorted octahedral |
| B. | XeO3 | 2. | Square planar |
| C. | XeOF4 | 3. | Pyramidal |
| D. | XeF4 | 4. | Square pyramidal |
| 1. | A-1, B-2, C-4, D-3 | 2. | A-4, B-3, C-1, D-2 |
| 3. | A-4, B-1, C-2, D-3 | 4. | A-1, B-3, C-4, D-2 |
| 1. | Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid |
| 2. | Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid |
| 3. | Both are triprotic acids |
| 4. | Both are diprotic acids |
Which of the statements given below is incorrect?
1. \(\mathrm{C l_{2} O_{7 }}\)is an anhydride of perchloric acid
2. \(\mathrm{O_{3}}\) molecule is bent
3. ONF is isoelectronic with \(\mathrm{N O_{2}^{-}}\)
4. \(\mathrm{O F_{2}}\) is an oxide of fluorine
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. |
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