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. |
Which of the following can be enthalpy of neutralisation of a weak acid and a strong base?A. `-57.1 kJ`B. `58.1 kJ`C. `-56.1 kJ`D. `114.2 kJ` |
| Answer» The magnitude of enthalpy of neutralisation of weak acid and strong base is always less than -57.1 kJ. Thus it can be -.51 kJ | |
| 102. |
$ `ZnCO_(3)` will not give any gas when treated with conc. `H_2SO_(4)` ! `CO_(3)^(2-)` can only be detected in dil. Acid testA. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. Both A and are false |
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Answer» Assertion: `ZnCO_(3)` will react with conc. `H_(2)SO_(4)` to give `CO_(2)` Reason: Radicals of dil. Acid test are decomposed by conc. `H_(2)SO_(4)` in cold. |
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| 103. |
The compound formed in the borax bead test of `Cu^(2+)` ion in oxidising flame isA. CuB. `CuBO_(3)`C. `Cu(BO_(2))_(2)`D. None of these |
| Answer» `Cu^(2+)` ions in oxidising flame from `Cu(BO_(2))_(2)` in borax bead test. | |
| 104. |
Which of the following cation can be detected by charcoal block test (cobalt nitrate test)?A. `Zn^(2+)`B. `Na^(+)`C. `NH_(4)^(+)`D. `Ni^(2+)` |
| Answer» Zinc oxide forms a green double -oxide with cobalt. | |
| 105. |
Flame test is not given byA. `Ba^(2+)` ionsB. `Ba^(2+)` ionsC. `Ca^(2+)` ionsD. `Na^(+)` ions |
| Answer» `Be^(2+)` does not give flame test because of its high ionisation energy. | |
| 106. |
When a salt is heated with dil. `H_2 SO_4` and `KMnO_4` solution, the pink colour of `KMnO_4` is discharged, the mixture containsA. sulphiteB. corbonateC. nitrateD. bicarbonate |
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Answer» `SO_(3)^(2-)` reduces `KMnO_(4)` and colour of `KMnO_(4)` is discharged `5SO_(3)^(2-) +2MnO_(4)^(-) + 6H^(+) to 2Mn^(2+) +5SO_(4)^(2-) +3H_(2)O` |
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| 107. |
In qualitative analysis `NH_4 Cl` is added before `NH_4 OH`A. The dissociation of `NH_(4)OH` increasesB. The concentration of `OH^(-)` increasesC. The concentration of both `OH^(-)` and `NH_(4)^(+)` increasesD. The concentration of `OH^(-)` decreases |
| Answer» The concentration `OH^(-)` decreases due to common to effect. | |
| 108. |
A green mass is formed in the charcoal cavity test when a colourless salt (X) is fused with cobalt nitrate. X containsA. `Al^(3+)`B. `Cu^(2+)`C. `Ba^(2+)`D. `Zn^(2+)` |
| Answer» Green colour formed is due to ZnO.Co O | |
| 109. |
A blue coloured residue obtained in cobalt nitrate charcoal cavity test is due toA. `Zn^(2+)`B. `Mg^(2+)`C. `Sn^(2+)`D. `Al^(3+)` |
| Answer» `Al_(2)O_(3).CoO` formed in the test is blue in colour. | |
| 110. |
A metal salt solution gives a yellow precipitate with silver nitrate. The precipitate dissolves in dilute nitric acid as well as in ammonium hydroxide. The solution containsA. bromideB. iodideC. phosphateD. chromate |
| Answer» `Ag_(3)PO_(4)` is yellow ppt. which is soluble both in `NH_(4)OH` and dil. `HNO_(3)` | |
| 111. |
Addition of a solution of oxalate to an aqueous solution of mixture of `Ba^(2+), Sr^(2+)` and `Ca^(2+)` will precipitateA. `Ca^(2+)`B. `Ca^(2+)` and `Sr^(2+)`C. `Ba^(2+)` and `Sr^(3+)`D. All the above |
| Answer» Oxalates of `Ca^(2+),Sr^(2+)` and `Ba^(2+)` are all insoluble in neutral media. | |
| 112. |
The alkaline earth metal that imparts apple green colour to the bunsen flame when introduced in it in the form of its chloride isA. BariumB. StrontiumC. CalciumD. Magnesium |
| Answer» `Ba^(2+)` imparts green colour to the flame | |
| 113. |
`C_6 H_5 OH` and `C_2 H_5 OH` can be distinguished byA. sodium metal testB. `NaHCO_(3)` testC. litmus testD. none of these |
| Answer» `C_(6)H_(5)OH` (phenol) and `C_(2)H_(5)OH` (ethanol-an alcohol ) can be distinguished by litmus test. Only phenol turns blue litmus red. | |
| 114. |
Methyl salicylate has a smell ofA. applesB. bitter almondsC. bananasD. none of these |
| Answer» Methyl salicylate has smell of oil of wintergreens . | |
| 115. |
Ethanol and methanol can be differentiated byA. sodium metal testB. litmus testC. `NaHCO_(3)` testD. iodoform test |
| Answer» Ethanol and methanol can be differentiated by iodoform test. Only ethanol gives this test. | |
| 116. |
Which of the following compounds does not interfere in the testing of alcoholic group by sodium metal test?A. ethoxyethaneB. phenolC. acetoneD. acetic acid |
| Answer» Ethoxyethane or diethyl ether does not react with sodium metal | |
| 117. |
Which of the following phenolic compound does not respond to phthalein test?A. o-CresolB. m-CresolC. p-CresolD. `beta`-Naphthol. |
| Answer» p-Cresol does not give phthalein test. | |
| 118. |
A mixture of two salts is not water soluble but dissolves completely in dil. HCl to form a colourless solution. The mixture could beA. `AgNO_(3)` and KBrB. `BaCO_(3)` and ZnSC. `FeCl_3` and `CaCO_(3)`D. `Mn(NO_(3))_(2)` and `MgSO_(4)` |
| Answer» `BaCO_(3) +ZnS` mixture dissolves in HCl but is insoluble in water. Further the solution in HCl will be colourless. | |
| 119. |
AgCl dissolves in ammonia solution givingA. `Ag^(+),NH_(4)^(+)` and `Cl^(-)`B. `[Ag(NH_(3))]^(+)` and `Cl^(-)`C. `[Ag(NH_(3))_(2)]^(2+)` and `Cl^-`D. `[Ag(NH_(3))_2]^(2)` and Cl^(-)` |
| Answer» `AgCl+2NH_(4)OH to [Ag(NH_3)_(2)]^(+) +Cl^(-) +2H_(2)O` | |
| 120. |
Which of the following does not react with AgCl ?A. `Na_2CO_(3)`B. `NaNO_(3)`C. `NH_(4)OH`D. `Na_(2)S_(2)O_(3)` |
| Answer» `NaNO_(3)` does not react with AgCl | |
| 121. |
Which one of the following is not efflorescentA. Hydrated `Na_(2)CO_(3)`B. hydrated `CuSO_(4)`C. NaOHD. All of these |
| Answer» NaOH absorbs moisture and is not efflorescent because efflorescent substances lose water. | |
| 122. |
Which of the following precipitates does not dissolve even in large exceeds of `NH_4 OH`?A. AgClB. AgBrC. AgID. None of these |
| Answer» AgI is not soluble in `NH_(4)OH` at all. | |
| 123. |
`[X] +H_(2)SO_(4) to ` [Y] colourless with irritating smell. [Y] +`K_(2)Cr_(2)O_(7)+H_(2)SO_(4) to ` green solution [X] and [Y] areA. `SO_(3)^(2-),SO_(2)`B. `Cl^(-),HCl`C. `S^(2-),H_(2)S`D. `CO_(3)^(2-),CO_(2)` |
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Answer» `X=SO_(3)^(2-)` ions, `Y=SO_(2)` `underset("(X)")(XO_(3)^(2-))+H_(2)SO_(4) to underset("(Y)")(SO_(2))+H_(2)O +SO_(4)^(2-)` `underset("(Y)")(3SO_(2))+K_(2)Cr_(2)O_(7)+H_(2)SO_(4) to K_(2)SO_(4) +underset("(Green)")(Cr_(2)(SO_(4))_(3))+H_(2)O` |
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| 124. |
Mark the correct statementA. I group basic radicals precipitates as chloridesB. IV group basic radicals precipitated as sulphidesC. V groups basic radicals precipitates as carbonatesD. All the above statements are correct |
| Answer» Refer comprehensive review | |
| 125. |
$ Acidified `K_(2)Cr_(2)O_(7)` is turned green when `SO_(2)` is passed thorugh it. ! In this reaction `SO_(2)` acts as a reducing agent.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true. |
| Answer» Both assertion (A) and reason (R) are correct and R is the correct explanation of A. | |
| 126. |
When `H_(2)S` gas is passed thorugh the HCl containing aqueous solution of `CuCl_2,HgCl_(2),BiCl_(3)` and `CoCl_(2)`, it does not precipitated outA. CuSB. HgSC. `Bi_(2)S_(3)`D. `CoS` |
| Answer» `Co^(2+)` is not precipitated in acidic medium. Its `K_(sp)` is much higher than `k_(sp)` of `Cu^(2+), Hg^(2+)` and `Bi^(3+)`. | |
| 127. |
Fumes of hydrochloric acid obtained by heating a dry salt in a test tube indicates the presence ofA. an alkali metal chlorideB. `Hg_(2)Cl_2`C. A hydrated chloride such as `ZnCl_(2).H_2O`D. An alkaline earth metal chloride. |
| Answer» A hydrated metal chloride. | |
| 128. |
An aqueous solution of colourless metal sulphate M gives a white precipitate with `NH_4 OH`. This was soluble in excess of `NH_4 OH`. On passing `H_2 S` through this solution a white ppt. is formed. The metal M in the salt isA. CaB. BaC. AlD. Zn |
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Answer» `Zn^(+) +2NH_(4)OH to underset("White ppt")(Zn(OH)_(2))+2NH_(4)^(+)` `Zn(OH)_(2)+2NH_(4)OH to underset("Soluble")((NH_(4))_(2)ZnO_(2))+2H_(2)O` `(NH_(4))_(2)ZnO_(2)+H_(2)S to underset("White ppt.")(ZnS)+2NH_(4)OH` |
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| 129. |
A salt solution is acidified with dil. HCl and `BaCl_2` solution is added. A white ppt. is formed. The salt containsA. `Cl^(-)`B. `Br^(-)`C. `NO_(3)^(-)`D. `SO_(4)^(2-)` |
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Answer» `SO_(4)^(2-) +BaCl_(2) overset(HCl)to underset("White ppt.")(BaSO_(4) darr)+2Cl^(-)` White ppt. of `BaSO_(4)` is insoluble in dil. HCl and other mineral acids. |
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| 130. |
On passing `H_2 S` into saturated solution of `BaCl_2`, white ppt. obtained is ofA. hydrogen chlorideB. formation of a complexC. barium chlorideD. barium sulphide. |
| Answer» `H_(2)S` separates `BaCl_(2)` from its saturated solution as white ppt. | |
| 131. |
Nitrate is confirmed by ring test. The brown colour of the ring test is due to the formation ofA. Ferrous nitriteB. `FeSO_(4).NO`C. `FeSO_(4).NO_(2)`D. Ferrous nitrate |
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Answer» `NaNO_(3)+H_(2)SO_(4)toNaHSO_(4)+HNO_(3)` `6FeSO_(4)+3H_(2)SO_(4)+2HNO_(3)` `to3Fe_(2)(SO_(4))_(3)+4H_(2)O +2NO` `FeSO_(4)+NO to underset("(Brown ring)")underset("Nitrosoferrous sulphate")(FeSO_(4).NO)` |
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| 132. |
A light greenish coloured salt was soluble in water. On passing `H_2 S` into the solution, a black ppt. was obtained which dissolved readily in HCl. The metal ion present isA. `Co^(2+)`B. `Fe^(2+)`C. `Ni^(2+)`D. `Mn^(2+)` |
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Answer» `Fe^(2+)+H_(2)S to underset("Black ppt.")(FeS darr) +2H^(+)` `FeS(s)+2HCl(aq) to FeCl_(2)(aq)+H_(2)S(g)` |
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| 133. |
Brown ring test is used to detectA. IodideB. NitrateC. IronD. Bromide |
| Answer» Ring test is used for confirming `NO_(3)^(-)` ion. | |
| 134. |
Colour of cobalt chloride solution isA. PinkB. BlackC. ColourlessD. Green |
| Answer» `CoCl_(2)` solution is pink. | |
| 135. |
On addition of aqueous NaOH to a salt solution, a white gelatinous precipitate is formed, which dissolves in excess of alkali. The salt solution containsA. Chromous ionsB. Aluminium ionsC. Barium ionsD. Iron ions. |
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Answer» `Al^(3+) +3OH^(-) to underset("White gelationous ppt.")(Al(OH)_(3))` `Al(OH)_(3) (s) +NaOH (aq) to NaAlO_(2) (aq)+2H_(2)O (l)`. |
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| 136. |
A pale green crystalline metal salt of M dissolves freely in water. It gives a brown precipitate on addition of aqueous NaOH. The metal salt solution also gtives a black precipitate on bubbling `H_2 S` in aqueous medium. An aqueous solution of the metal salt decolourizes the pink colour of the premanganate solution. The metal in the metal salt solution isA. copperB. AluminiumC. LeadD. Iron |
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Answer» Pale green salt contain a mixture of `Fe^(2+)` and `Fe^(3+)` ions. `Fe^(3+) +3OH^(-) to underset("Brown ppt.")(Fe(OH)_(3)` `Fe^(2+) +S^(2-) to underset("Brown ppt.")(FeS)` `Fe^(2+)` reduces `KMnO_(4)` discharging its pink colour. |
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| 137. |
If NaOH is added to an aqueous solution of zinc ions a white precipitate appears and on adding excess of NaOH, the precipitate dissolves. In this solution, zinc exists in theA. Cationic partB. Anionic partC. Both in the cationic and anionic partsD. there is no zinc ion in the solution |
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Answer» `Zn^(2+)+2NaOH to Zn(OH)_(2) +2Na^(+)` `Zn(OH)_(2) +2NaOH to Na_(2)ZnO_(2)+2H_(2)O` |
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