InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
One mole of `PCl_(3)` is dissolved in excess of water. No. of moles of NaOH required to neutralise this solution completely is |
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Answer» Correct Answer - 5 `PCl_(3) + 3H_(2)O rarr ubrace(H_(3)PO_(3))_("(dibasic)") + 3HCl " " :.` Total 5 moles of NaOH required |
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| 102. |
Which is greater for `P_(4)` (white) tan `P_(4)` (red)A. Molar entropyB. Melting pointC. Solubility in `CS_(2)`D. Ignition temperature |
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Answer» Correct Answer - A::C Factual |
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| 103. |
Dinitrogen gas is evolved when sodium nitrite is heated below `500^(º)C`A. aloneB. with ammonium chlorideC. with sodium chlorideD. with potassium nitrate |
| Answer» Correct Answer - B | |
| 104. |
Which statement is not correct for nitrogen?A. It is obtained by heating `(NH_(4))_(2) Cr_(2)O_(7)`B. It does not readily react with `O_(2)`C. It is a typical non-metalD. d-orbitals are available for bonding |
| Answer» Correct Answer - D | |
| 105. |
Which of the following have `Delta H_(f)^(º) lt 0`A. OzoneB. O(g)C. P(red)D. `S_(8)` (monoclinic) |
| Answer» Correct Answer - C | |
| 106. |
The anhydride of nitric acid isA. nitric oxideB. nitrous oxideC. dinitrogen trioxideD. dinitrogen pentoxide |
| Answer» Correct Answer - D | |
| 107. |
Which of the following is a mixed acid anhydride ?A. NOB. `NO_(2)`C. `N_(2)O_(5)`D. `N_(2)O` |
| Answer» Correct Answer - B | |
| 108. |
When ammonia is oxidsed by oxygen in the presence of platinum at `800^(@)C`, the gas obtained is :A. `N_(2)O`B. NOC. `NO_(2)`D. `N_(2)O_(5)` |
| Answer» Correct Answer - B | |
| 109. |
Substances burn more readily in `N_(2)O` than in air because `N_(2)O`:A. is reactive at high temperatureB. dissociates to give more nitrogen than in airC. the activation energy is increased on increasing temperatureD. dissociates more readily than `O_(2)` |
| Answer» Correct Answer - D | |
| 110. |
Sulphur on boiling with `NaOH` solution givesA. `Na_(2)S_(2)O(3) + NaSO_(3)`B. `Na_(2)S_(2)O_(3) + Na_(2)S`C. `Na_(2)SO_(3) + H_(2)S`D. `Na_(2)SO_(3) + SO_(2)` |
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Answer» Correct Answer - B `3S + 6NaOH rarr 3H_(2)O + 2Na_(2)S + Na_(2)SO_(3)` |
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| 111. |
Nitrolim is obtained by passing nitrogen over:A. heated mixture of `Al_(2)O_(3)` and carbonB. oleumC. calcium carbideD. heated calcium carbide |
| Answer» Correct Answer - D | |
| 112. |
Which among the following is/are peroxo acid (s) ?A. `H_(2)S_(2)O_(3)`B. `H_(2)SO_(3)`C. `H_(2)S_(2)O_(7)`D. `H_(2)S_(2)O_(8)` |
| Answer» Correct Answer - B::D | |
| 113. |
Which of the following cannot dissociated as `PX_(5) hArr PX_(3) + X_(2)`A. `PF_(5)`B. `PCl_(5)`C. `PBr_(5)`D. `PI_(5)` |
| Answer» Correct Answer - A | |
| 114. |
The aqeous solution of hydrogen peroxide:A. converts blue litmus pinkB. converts blue litumus whiteC. converts red litumus blueD. None of these |
| Answer» Correct Answer - B | |
| 115. |
What happens when: ltbr (a) `NH_(4) Cl " & " NaNO_(3)` is heated strongly (b) `(NH_(4))_(2) CO_(3)` is heated. (c) `NH_(4) NO_(2)` is heated. |
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Answer» (a) `NH_(4)Cl + NaNO_(3) rarr NH_(4) NO_(3) + NaCl , NH_(4) NO_(3) overset(Delta)rarr N_(2)O + 2H_(2)O` (b) `(NH_(4))_(2) CO_(3) overset(Delta)rarr 2NH_(3) + CO_(2) + H_(2)O` (c) `NH_(4) NO_(2) overset(Delta)rarr N_(2) + 2H_(2)O` |
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| 116. |
Sulphuric acid reacts with `PCl_5` to giveA. Thionyl chlorideB. Sulphur monochlorideC. Sulphuryl chlorideD. Sulphur tetrachloride |
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Answer» Correct Answer - C `2PCl_(5) + H_(2)SO_(4) rarr SO_(2)Cl_(2) + 2POCl_(3) + 2HCl` |
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| 117. |
Thermodynamically most stable allotrope of phosphorus is :A. RedB. WhiteC. BlackD. Yellow |
| Answer» Correct Answer - C | |
| 118. |
Phosphorus trichloride, `PCl_(3)` undergoes, hydrolysis at room temperature to produce an oxoacid. It has the formula :A. `HPO_(3)`B. `H_(3)PO_(3)`C. `H_(3)PO_(4)`D. `H_(3)PO_(2)` |
| Answer» Correct Answer - B | |