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.
| 1. |
The golden yellow colour associated with `NaCl` to Bunsen flame be explained on the basis ofA. low ionisation potential of sodiumB. emission spectrumC. photosensitivity of sodiumD. Sublimation of metallic sodium of yellow vapours |
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Answer» Correct Answer - A The golden yellow colour associated with `NaCl` to Bunsen flame can be explained on the basis of low ionisation potential of sodium. |
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| 2. |
Potassium is kept inA. AlcoholB. WaterC. KeroseneD. Liquid ammonia |
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Answer» Correct Answer - C Alkali metals are highly reactive metal. They react with `{:("Alcohol",,-2C_(2)H_(5)OH+2K rarr 2C_(2)H_(5)OK+H_(2)),("Water",,-2K+2H_(2)O rarr 2KOH+H_(2)),("Ammonia",,underset("Ammoniated cation")(-K+(x+y)NH_(3)) rarr underset("Ammoniated electron")([K(NH_(3))_(x)]^(+)+[e(NH_(3))_(y)]^(-))):}` But they do not react with kerosene. |
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| 3. |
The cation which gives a yellow precipitate with potassium chromate isA. `SrCO_(3)`B. `BaCO_(3)`C. `CaCO_(3)`D. `MgCO3` |
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Answer» Correct Answer - B Barium gives a yellow ppt. of barium chromate with pot. Chromate. `K_(2)CrO_(4)+Ba^(2+) rarr BaCrO_(4)+2K^(+)` |
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| 4. |
Which is an ore of potassiumA. CarnalliteB. CryoliteC. BauxiteD. Dolomite |
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Answer» Correct Answer - A `{:("Carnallite"-KCl","MgCl_(2)","6H_(2)O,"Cryolite"-Na_(3)AlF_(6)),("Bauxite"-(Al_(2)O_(3).2H_(2)O),"Dolomite"-MgCO_(3).CaCO_(3)):}` |
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| 5. |
`KF` combination with `HF` to form `KHF_(2)`. The compound contains the speciesA. `K^(+), F^(-)` and `H^(+)`B. `K^(+), F^(-)` and `HF`C. `K^(+)` and `[HF_(2)]^(-)`D. `[KHF]^(+)` and `F^(-)` |
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Answer» Correct Answer - C `KF+HF rarr KHF_(2) hArr K^(+)+HF_(2)^(-)` |
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| 6. |
Which of the following on thermal decomposition yields a basic as well as an acidic oxide?A. `CaCO_(3)`B. `NH_(4)NO_(3)`C. `NaNO_(3)`D. `KClO_(3)` |
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Answer» Correct Answer - A::B `NaNO_(3) overset(Delta)(rarr) NaNO_(2)+1//2 O_(2)` `2KClO_(3) overset(Delta)(rarr) 2KCl+3O_(2)` Metal oxides are bases non metallic oxides are acidic except `CO, NO, H_(2)O, N_(2)O` are netural oxide. |
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| 7. |
Which of the following is not a water softener?A. `Na_(2)CO_(3)`B. `Na_(2)SO_(4)`C. CalgonD. Permutit |
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Answer» Correct Answer - B `rarr" "Na_(2)CO_(3)` precipitates out `Ca^(++)` and `Mg^(++)` from hard water as insoluble carbonates `rarr" "` Calgon, `(NaPO_(3))_(6)`, exchanges `Ca^(++)` and `Mg^(++)` from hard water `rarr" "` Permutit : common type of zeolite, it exchanges `Ca^(++)` and `Mg^(++)` from hard water with its `Na^(+)` and also not allow to pass large sized molecules from it. |
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| 8. |
A solution of metal hydroxide `(MOH)` with copper sulphate and mixed tartarate of metal `M` with another metal `M_(1)` of the same group is used in the detection of `-CHO` froup. Metal `M` and `M_(1)` are respectivelyA. `K, Na`B. `K, Rb`C. `Na, Li`D. `Rb, Na` |
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Answer» Correct Answer - A `NaOH+CuSO_(4)+` sodium `(M)` Potassium `(M_(1))` tartatate solution is known as Fehling solution and is used in the detection of `-CHO` group |
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| 9. |
Which of the following statement is falseA. The milk of magnesia used as antacid is chemically `MgO+MgCl_(2)`B. Stability of alkali metal peroxides increases with increase in atomic number.C. Hydration energy of `AgF` is higher than its lattice energyD. Anhydrous `MgCl_(2)` cannot be prepared by direct heating of `MgCl_(2).6H_(2)O`. |
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Answer» Correct Answer - A Milk of magnesia is a suspension of `MgO+H_(2)O` |
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| 10. |
Which of the following is used as barium meal for getting the `X`-ray spectrum of the human gigestive system?A. `BaSO_(4)`B. `BaCl_(2)`C. `BaF_(2)`D. `BaCO_(3)` |
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Answer» Correct Answer - A `BaSO_(4)` is both insoluble in water and opaque to `X`-rays and hence is used to get the `X`-ray spectrum of the digestive system? |
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| 11. |
Which liberates ammonia when treated withA. `Li_(3)N`B. `Mg_(3)N_(2)`C. `CaCN_(2)`D. All |
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Answer» Correct Answer - D All nitride react with `H_(2)O` to yield `NH_(3)`. Calcium cyanamide `(CaCN_(2))` on hydrolysis also given `NH_(3)`. `CaNCN+3H_(2)O rarr CaCO_(3)+NH_(3)` |
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| 12. |
Which of the following substance is used as dehydrating agent in laboratoryA. Calcium chlorideB. Sodium chlorideC. Sodium carbonateD. Potassium nitrate |
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Answer» Correct Answer - A `CaCl_(2)` because it is hygroscopic. |
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| 13. |
Which of the following is incorrect?A. `Mg` burns in air releasing dazzing light rich in `UV` raysB. `CaCl_(2).6H_(2)O` when mixed with ice gives freezing mixtureC. `Mg` cannot form complexesD. `Be` can form complexs due to its very small. |
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Answer» Correct Answer - C `Mg` can form complexes and chlorophyll is one of such examples. |
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| 14. |
Setting of plaster of paris isA. Oxidation with atmospheric `CO_(2)`B. Combination with atmospheric `CO_(2)`C. DehydrationD. Hydration to yield another |
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Answer» Correct Answer - D Setting of plaster of paris is `underset("orthorhombic")(CaSO_(4). (1)/(2) H_(2)O overset(H_(2)O)(rarr) CaSO_(4).2H_(2)O)underset("Mono orthorhombic Gypsum")( overset("Hardening")(rarr)CaSO_(4).2H_(2)O)` The setting is due to formation of another hydrate |
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| 15. |
`NaOH` gives disproportionation reaction withA. `S`B. `CO_(2)`C. `SO_(2)`D. `SO_(3)` |
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Answer» Correct Answer - A `4S+6NaOH overset(Delta)(rarr) Na_(2)S_(2)O_(3)+underset("with excess pentasulfide forms")(2Na_(2)S+3H_(2)O)` `Na_(2)S+4S rarr Na_(2)S_(5)` |
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| 16. |
White phosphorus on reaction with `NaOH` gives `PH_(3)` as one of the products. This is aA. dimerization reactionB. disproportionation reactionC. condensation reactionD. precipitation reaction |
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Answer» Correct Answer - B White phosphorus `(P_(4))` on reaction with `NaOH` gives `PH_(3)` (oxidation state of phosphorus is `-3`) & `NaH_(2)PO_(2)` (oxidation state of phosphorus is +1). This reaction is type of disproportionation reaction. |
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| 17. |
Which of the following carbide produces propyne on reaction with water.A. `CaC_(2)`B. `Be_(2)C`C. `Al_(4)C_(3)`D. `Mg_(2)C_(3)` |
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Answer» Correct Answer - D (A) `CaC_(2)+H_(2)O rarr Ca(OH)_(2)+HC equiv CH uarr` (B) `Be_(2)C+2H_(2)O rarr 2 BeO+CH_(4) uarr` (C) `Al_(4)C_(3)+12 H_(2)O rarr 4Al (OH)_(3)+3CH_(4) uarr` (D) `Mg_(2)C_(3)+4H_(2)O rarr 2Mg(OH)_(2)+H_(3)C-C equiv CH uarr` |
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| 18. |
In alkaline earth metals, the electrons are more firmly held to the nucleus and henceA. Ionization energy of alkaline earth metals is greater than that of alkali metalsB. Alkaline earth are less abundant in natureC. Reactivity of alkaline earth metals is greater than that of alkali metalsD. Atoms of alkaline earth metals are bigger in size than alkali metals. |
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Answer» Correct Answer - A Ionization energies of alkaline earth metals are greater than those of alkali metals due to increased nuclear charge. |
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| 19. |
Sodium ordinarily does not show an oxidation state of `+2`, because of itsA. High first ionization potentialB. High second ionization potentialC. Large ionic radiusD. High electronegativity |
| Answer» Correct Answer - B | |
| 20. |
Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?A. `BaSO_(4)`B. `SrSO_(4)`C. `CaSO_(4)`D. `BeSO_(4)` |
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Answer» Correct Answer - D Soludility order of sulphates in water `BeSO_(4) gt CaSO_(4) gt SrSO_(4) gt BaSO_(4)` `BeSO_(4)` has greater hydration enthalpy than its lattice enthyalpy Because `Be^(2+)` ion has maximum charge density. |
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| 21. |
Alkaline earth metal show typical characterics ofA. Inner transition elementsB. Noble gasesC. Representative elementsD. Transition elements |
| Answer» Correct Answer - C | |
| 22. |
Flame test is not given byA. `Be`B. `Mg`C. `Ca`D. `Sr` |
| Answer» Correct Answer - A::B | |
| 23. |
The pair of compounds which cannot exist together in aqueous solution is: `(I) NaH_(2)PO_(4)` and `NaHCO_(3)" "(II) Na_(2)CO_(3)` and `NaHCO_(3)` `(III) NaOH` and `NaH_(2)PO_(2)" "(IV) NaHCO_(3)` and `NaOH`A. `I, II, III`B. `II, III`C. `I, IV`D. only `IV` |
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Answer» Correct Answer - D Acidic salt `NaHCO_(3)` and `NaOH` (base) react with each other so they cannot exist together in aqueous solution. |
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| 24. |
Calcium imide on hydrolysis will give gas `(B)` which on oxidation by beaching powder gives gas `(C)` gas `(C)` on reaction with magnesium give compound `(D)`. `(D)` on hydrolysis gives gas `(B)`. `(B), (C)` and `(D)` areA. `NH_(3), N_(2), Mg_(3)N_(2)`B. `N_(2), NH_(3), MgNH`C. `N_(2), N_(2)O_(5), Mg(NO_(3))_(2)`D. `NH_(3), NO_(2), Mg(NO_(2))_(2)` |
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Answer» Correct Answer - A `Ca(NH)+2H_(2)O rarr Ca(OH)_(2)+underset((B))(NH_(3))(g)` `underset((B))(2NH_(3))+3CaOCl_(2) rarr underset((C))(N_(2)(g)) +3CaCl_(2)+3H_(2)O` `underset((C))(N_(2)(g))+3Mg rarr underset((D))(Mg_(3)N_(2))` `underset((D))(Mg_(3)N_(2))+6H_(2)O rarr 3Mg(OH)_(2)+underset((B))(2NH_(3))` |
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| 25. |
Choose the correct alternate (s). (I) `BeCO_(3)` is kept in the stmosphere of `CO_(2)` since it is least thermally stable. (II) Be dissolved in an alkali forming `[Be(OH)_(4)]^(2-)` (III) `BeF_(2)` forms complex ion with `NaF` in which `Be` goes with cation. (IV) `BeF_(2)` forms complex ion with `NaF` in which `Be` goes with anion.A. `I, II, III`B. `II & III`C. `I, II, III & IV`D. `I, II & IV` |
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Answer» Correct Answer - D `BeF_(2)+2NaF rarr Na_(2) [BeF_(4)]` |
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| 26. |
Portland cement is manufactured by using-A. Lime stone, clay and sandB. Lime stone, gypsum and sandC. Lime stone, gypsum and aluminaD. Lime stone, clay and gtpsum |
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Answer» Correct Answer - D Lime stone- `CaCO_(3)` Clay- silica and alumina Gypsum-`CaSO_(4).2H_(2)O` |
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| 27. |
Statement I: Alkali metals dissolve in liquid ammonia to give blue solutions. Statement II: Alkali metals in liquid ammonia give solvated species of the type `[M(NH_(3))_(n)]^(o+)` (M = alkali metals).A. If both statement-I & Statement-II are True & the Statement-II is a correct explanatiom of the Statement-I.B. If both statement-I & Statement-II are True but Statement-II is not a correct explanatiom of the Statement-I.C. If statement-I is True but the Statement-II is False.D. If statement-I is False but the Statement-II is True. |
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Answer» Correct Answer - B Blue solution to the presence of solvated/ammonated `e^(-)` |
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| 28. |
The ion having highest mobility in aqueous solutionisA. `Be^(2+)`B. `Mg^(2+)`C. `Ca^(2+)`D. `Ba^(2+)` |
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Answer» Correct Answer - D Through `Ba^(2+)` is the heaviest ion but it is least hydrated. As a result, its size becomes lesser than any other hydrated alkaline earth metal cation and hence has the highest ionic mobility. |
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| 29. |
The atom with atomic number `12` will most likely combine chemically with atom whose atomic number isA. `3`B. `10`C. `11`D. `16` |
| Answer» Correct Answer - D | |
| 30. |
`Mg_(2)C_(3)` reacts with water forming propyne. `C_(3)^(4-)` hasA. Two sigma and two pi bondsB. Three sigma and one pi bondC. Two sigma and one pi bondD. Two sigma and three pi bonds |
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Answer» Correct Answer - A `(overset(-2)(C)=C=overset(-2)(C))` has two sigma and two pi bonds |
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| 31. |
How many `X-O-X` linkages are present in the structure of calgon `(NaPO_(3))_(6)` |
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Answer» Correct Answer - 6 It is a cyclic structure having six `P-O-P` linkages. |
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| 32. |
`Li` has the maximum value of ionisation potential among alkali metals i.e. lithium has the minimum tendency to ionise to give `Li^(+)` ion. Lithium is-A. Strongest reducingB. Poorest reducing agentC. Strongest oxidising agentD. Poorest oxidising agent |
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Answer» Correct Answer - A The ionisation potential value of Lithium is maximum among alkali metal i.e., its tendency to ionise to give `Li^(+)` ions should be the minimum i.e. `Li` should be the poorest reducing agent. But, lithium is the strongest reducing agent. This is due to the largest value of hydration energy of `Li^(+)` ions. |
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| 33. |
Nitrogen dioxide can not be obtained fromA. `Cu(NO_(3))_(2)`B. `Hg(NO_(3))_(2)`C. `NaNO_(3)`D. `AgNO_(3)` |
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Answer» Correct Answer - C `NaNO_(3) overset("below")underset(500^(@)C)(rarr) NaNO_(2)+1/2 O_(2)` `Cu(NO_(3))_(2) overset(Delta)(rarr) CuO+2NO_(2) uarr +1/2 O_(2) uarr` |
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