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. \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6} \text { and } \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}\)
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.
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 |
Which of the following statements is correct?
| 1. | Only type of interactions between particles of noble gases are due to weak dispersion forces. |
| 2. | Ionisation enthalpy of molecular oxygen is very high as compared to xenon. |
| 3. | Hydrolysis of XeF6 is a redox reaction. |
| 4. | Xenon fluorides are not reactive. |
Match the formulas of oxides given in Column I with the type of oxide given in Column II and mark the correct option.
| Column I | Column II |
| A. Pb3O4 | 1. Neutral oxide |
| B. N2O | 2. Acidic oxide |
| C. Mn2O7 | 3. Basic oxide |
| D. Bi2O3 | 4. Mixed oxide |
Codes
| A | B | C | D | |
| 1. | 1 | 2 | 3 | 4 |
| 2. | 4 | 1 | 2 | 3 |
| 3. | 3 | 2 | 4 | 1 |
| 4. | 4 | 3 | 1 | 2 |
© 2025 GoodEd Technologies Pvt. Ltd.