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 incorrect statement among the following regarding noble gases:
1. | Noble gases have weak dispersion forces. |
2. | Noble gases have large positive values of electron gain enthalpy. |
3. | Noble gases are sparingly soluble in water. |
4. | Noble gases have very high melting and boiling points. |
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?
1. | NH3 < PH3 < AsH3 < SbH3 | Increasing acidic character |
2. | CO2 < SiO2 < SnO2 < PbO2 | Increasing oxidizing power |
3. | HF < HCl < HBr < HI | Increasing acidic strength |
4. | H2O < H2S < H2Se < H2Te | Increasing pKa values |
Which one of the following reactions does not come under hydrolysis type reaction?
1.
2.
3.
4.
Match the compounds of Xe in column I with the molecular structure in column II.
Column-I | Column-II |
(a) XeF2 | (i) Square planar |
(b) XeF4 | (ii) Linear |
(c) XeO3 | (iii) Square pyramidal |
(d) XeOF4 | (iv) Pyramidal |
(a) | (b) | (c) | (d) | |
1. | (ii) | (i) | (iii) | (iv) |
2. | (ii) | (iv) | (iii) | (i) |
3. | (ii) | (iii) | (i) | (iv) |
4. | (ii) | (i) | (iv) | (iii) |
Assertion (A): | ICI 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. |
Statement I: | The boiling points of the following hydrides of group 16 elements increase in the order \(\mathrm{H}_{2} \mathrm{O}<\mathrm{H}_{2} \mathrm{~S}<\mathrm{H}_{2} \mathrm{Se}<\mathrm{H}_{2} \mathrm{Te} \) |
Statement II: | The boiling points of these hydrides increase with the increase in molar mass. |
The correct order for boiling points of the following compounds is:
1. | AsH3 > PH3 > NH3 > SbH3 > BiH3 |
2. | BiH3 > SbH3 > NH3 > AsH3 > PH3 |
3. | NH3 > PH3 > AsH3 > SbH3 > BiH3 |
4. | PH3 > NH3 > AsH3 > SbH3 > BiH3 |
Chlorine shows the bleaching action in the presence of moisture due to the formation of
1. HOCl
2. HOClO
3. H2O2
4. O
1. | \(\mathrm{NaNO}_3+\mathrm{H}_2 \mathrm{SO}_4\xrightarrow[500~K, \ 9\text{ bar}]{Pt} \mathrm{NaHSO}_4+\mathrm{HNO}_3\) |
2. | \(4 \mathrm{NH}_3+5 \mathrm{O}_2 \text{(from air)}\xrightarrow[500~K, \ 9\text{ bar}]{Pt} 4 \mathrm{NO}+6 \mathrm{H}_2 \mathrm{O}\) |
3. | \(4 \mathrm{HPO}_3+2 \mathrm{~N}_2 \mathrm{O}_5\xrightarrow[500~K, \ 9\text{ bar}]{Pt} 4 \mathrm{HNO}_3+\mathrm{P}_4 \mathrm{O}_{10}\) |
4. | \(\mathrm{Cu}\left(\mathrm{NO}_3\right)_2+2 \mathrm{NO}_2+2 \mathrm{H}_2 \mathrm{O} \\ \xrightarrow[500~K, \ 9\text{ bar}]{Pt} 4 \mathrm{HNO}_3+\mathrm{Cu}\) |