Q. No.
The oxidation state of the central atom in the anion of compound \(\mathrm{NaH}_2 \mathrm{PO}_2\) will be:
1.
+3
2.
+5
3.
+1
4.
-3
A compound that does not have a tetrahedral shape is:
1. \(\mathrm{NH}_{4}^{+}\)
2. \(\mathrm{SiCl}_{4}\)
3. \(\mathrm{SF}_{4}\)
4. \(\mathrm{SO}_{4}^{2-}\)
Which of the following are peroxoacids of sulphur?
1. \(\mathrm{H}_{2} \mathrm{SO}_{5} \text { and } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\)
2. \(\mathrm{H}_{2} \mathrm{SO}_{5} \text { and } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}\)
3. \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7} \text { and } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\)
4. \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6} \text { and } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}\)
In the preparation of compounds of Xe, Bartlett had taken \(O_{2}^{+}PtF_{6}^{-}\) as a base compound. This is because:
1. Both and Xe have same size.
2. Both and Xe have same electron gain enthalpy.
3. Both and Xe have almost same ionisation enthalpy.
4. Both Xe and are gases.
Which of the following is true regarding the P4 molecule of white phosphorus?
1. It has 6 lone pairs of electrons.
2. It has four P — P single bonds.
3. It has three P — P single bonds.
4. It has four lone pairs of electrons.
The correct statement among the following about SO2 gas is:
| 1. | It acts as bleaching agent in moist conditions. |
| 2. | It's molecule has linear geometry. |
| 3. | It's concentrated solution is used as a disinfectant. |
| 4. | It can be prepared by the reaction of dilute H2SO4 with metal sulphide. |
Which of the following statements is true?
| 1. | All three N – O bond lengths in HNO3 are equal. |
| 2. | All P – Cl bond lengths in PCl5 molecule in gaseous state are equal. |
| 3. | P4 molecules in white phosphorus have angular strain. Therefore, white phosphorus is very reactive. |
| 4. | PCl5 is ionic in a solid state in which the anion is tetrahedral and the cation is octahedral. |
Which of the following is the correct match?
1. As2O3 < SiO2 < P2O3 < SO2 - Basic strength.
2. AsH3 < PH3 < NH3 - Enthalpy of vaporisation.
3. S < O < Cl < F - More negative electron gain enthalpy
4. H2O > H2S > H2Se > H2Te - Thermal stability
Which of the following statements is true?
| 1. | S — S bond is present in H2S2O6 |
| 2. | In peroxosulphuric acid (H2SO5) sulphur is in +5 oxidation state. |
| 3. | Iron powder, along with Al2O3 and K2O, is used as a catalyst in the preparation of NH3 by Haber's process. |
| 4. | Change in enthalpy is positive for the preparation of SO3 by catalytic oxidation of SO2 |
a. \(\mathrm{CaF}_2+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{CaSO}_4+2 \mathrm{HF}
\)
b. \(2 \mathrm{HI}+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{I}_2+\mathrm{SO}_2+2 \mathrm{H}_2 \mathrm{O}
\)
c. \(\mathrm{Cu}+2 \mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{CuSO}_4+\mathrm{SO}_2+2 \mathrm{H}_2 \mathrm{O}
\)
d. \(\mathrm{NaCl}+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{NaHSO}_4+\mathrm{HCl}\)
In which of the above-mentioned reactions does conc. \(\mathrm{H}_2 \mathrm{SO}_4\) act as an oxidising reagent?
| 1. | a and b | 2. | b and c |
| 3. | c and d | 4. | a and d |
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