Assertion (A): | ICl is more reactive than I₂. |
Reason (R): | I-Cl bond is weaker than I-I bond. |
1. | (A) is False but (R) is True. |
2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
4. | (A) is True but (R) is False. |
Chlorine shows the bleaching action in the presence of moisture due to the formation of
1. HOCl
2. HOClO
3. H2O2
4. O
(a) | F–F bond has a low enthalpy of dissociation. |
(b) | Flouride ion (F–) has high hydration enthalpy. |
(c) | Electron gain enthalpy of fluorine is less negative than chlorine. |
(d) | Fluorine has a very small size. |
1. | (a) and (b) only | 2. | (a) and (c) only |
3. | (a) and (d) only | 4. | (b) and (c) only |
I: | Acid strength increases in the order given as HF < HCl < HBr < HI. |
II: | As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCI, HBr, and HI decreases and so the acid strength increases. |
1. | I is correct but II is False. |
2. | I is incorrect but II is True. |
3. | Both I and II are True. |
4. | Both I and II are False. |
Choose the pairs of isoelectronic compounds which are isostructural:
1. TeF2, XeF2
2. IBr2-, XeF2
3. IF3, XeF2
4. BeCl2, XeF2
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 given sequence among the following arrangements that is not strictly according to the property indicated against it.
1. | \(\small{\text{increasing} \ p K_{a}\ \text{values}}\) | H2O < H2S < H2Se < H2Te :
2. | \(\small{\mathrm{N H_{3} < P H_{3} < A s H_{3} < S b H_{3}} : \text{increasing acidic character}}\) |
3. | \(\small{\mathrm{C O_{} < S i O_{} < S n O_{} < P b O_{2}} : \text{increasing oxidising power}} \) |
4. | \(\small{\mathrm{H F < H C l < H B r < H I} : \text{increasing acidic strength}} \) |