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. |
A Typical characteristic of the representative element is that the first member of each group gives different present in that group. Lithium is no excepton. Through it is the first member of the alkali metal family (group f), it is anomalous in behaviour. This may be attributed to the small size of both Li and `Li^(+)` ion, high ionisation enthalpy, high polarising power, and non- availability of d-electrons in its valence shell. Which of the following ions has the lowest mobility in aqueous solution ?A. `Li^(+)`B. `Na^(+)`C. `K^(+)`D. `Cs^(+)` |
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Answer» Correct Answer - A `Li^(+)` ion has the minimum mobility because it is maximum hydrated in aqueous solution i.e., it exists as `Li^(+)` (aq) ion. |
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| 2. |
Assertion (A): `K_(2)CO_(3)` cannot be prepared by Solvaly process. Reason (R ): `KHCO_(3)` being fairly soluble does not precipitate out in carbonation tower.A. If both assertion and reason and correct and reason explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertionC. If assertion is correct but reason is incorrectD. If both assertion and reason are incorrect |
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Answer» Correct Answer - A Reason is the correct explanation for assertion |
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| 3. |
`{:(,"COLUMN-I","COLUMN-II"),((A),KHCO_(3) ,(P)"Exists in solid state"),((B),NaHCO_(3),(Q)"Soluble in water"),((C),LiHCO_(3),(R)"Hydrogen bonding"),((D),NH_(4)HCO_(3),(S)"Dimeric anion"):}`A. A-Q,B-PR,C-P,D-SB. A-PQRS,B-PQR,C-Q,D-PC. A-PQ,B-S,C-P,D-RSD. A-P,B-PS,C-R,D-Q |
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Answer» Correct Answer - B |
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| 4. |
Number of `HCO_(3)` ions joined by Hydrogen bonding in `KHCO_(3)` is : |
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Answer» Correct Answer - 2 |
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| 5. |
Assertion: `KHCO_(3)` can not be obtained by solvay process. Reason: `KHCO_(3)` is less soluble than `NaHCO_(3)`A. If both Assertion & Reason are True & the Reason is a correct explanation of the AssertionB. If both Assertion & Reason are True but Reason is not a correct explanation of the AssertionC. If Assertion is True but the Reason is FalseD. If both Assertion & Reason are False |
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Answer» Correct Answer - C `HCO_(3)^(-)` ion is considerd as relatively large ion and for large common ion. Solubility `prop` Hydration energy `KHCO_(3)` is more soluble than `NaHCO_(3)` |
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| 6. |
How many of the following bicarbonates are solid in nature? `LiHCO_(3),NaHCO_(3),KHCO_(3),RbHCO_(3),CaHCO_(3),CsHCO_(3), Be(HCO_(3))_(2), Mg(HCO_(3))_(2),Ca(HCO_(3))_(2)Sr(HCO_(3))_(2),Ba(HCO_(3))_(2)` |
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Answer» Correct Answer - 4 |
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| 7. |
Identify W, X, Y and Z respectively in the given reactions. `CaCO_(3)overset(Delta)toW+X` `W+H_(2)O to Y` `Y+Z to NaOH+CaCO_(3)`A. `CaO, CO_(2), CaCO_(3), Na_(2)CO_(3)`B. `Co_(2), Ca(OH)_(2), Ca(HCO)_(3), NaHCO_(3)`C. `CaO, CO_(2), Ca(OH)_(2), Na_(2) CO_(3)`D. `CO_(2), CaO, H_(2)CO_(3), Na_(2)CO_(3)` |
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Answer» Correct Answer - C `CaCo_(3) overset(Delta)to underset((W))(CaO)+ underset((X))(CO_(2))` `underset((W)) (CaO)+ H_(2)O to underset((Y)) ( Ca(OH)_(2))` ` underset((Y)) (Ca(OH)_(2))+ underset((Z))(Na_(2) Co_(3))to CaCO_(3)+ 2NaOH` |
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| 8. |
Which of the following is a good dehydrating agent.A. Conc. HClB. Anhydrous `CaCl_(2)`C. `NanO_(2)`D. `K_(2)CO_(3)` |
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Answer» Correct Answer - 2 |
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| 9. |
Assertion: Halides of Be dissolve in organic solvents Reason: Atomic size of Be is smaller in the s-block elements.A. If both Assertion & Reason are True & the Reason is a correct explanation of the AssertionB. If both Assertion & Reason are True but Reason is not a correct explanation of the AssertionC. If Assertion is True but the Reason is FalseD. If both Assertion & Reason are False |
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Answer» Correct Answer - B Be salts have higher covalent character due to higher value of `phi`. |
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| 10. |
Assertion : Alkali metals have least value of ionization energy within a period. Reason : They precede alkaline earth metals in periodic table.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - b Both are correct. The lower ionisation energy of alkali metals is due to their small size. |
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| 11. |
The first ionisation energies of alkaline earth metal are higher than those of the alkali metals. This is because:A. there is increase in the nuclear charge of the alkaline earth metalB. there is decrease in the nuclear charge of alkaline earth metalC. there is no change in the nuclear chargeD. none of these |
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Answer» Correct Answer - A Along the period from left to right, atomic number increaes and, therefore, nuclear charge also increases. So first ionization energies of alkaline earth metals are higher than those of the alkali metals of the same period because of higher nuclear charge. |
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| 12. |
If X and Y are the second ionisation potentials of alkali and alkaline earth metals of same period, then :A. `XgtY`B. `XltY`C. `X=Y`D. `Y=X` |
| Answer» Correct Answer - A | |
| 13. |
The least stable carbonate of alkali metal isA. `Cs_(2)CO_(3)`B. `Na_(2)CO_(3)`C. `K_(2)CO_(3)`D. `Rb_(2)CO_(3)` |
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Answer» Correct Answer - D As the size of the cation increases , M-O bond weakens and C-O bond strengthens . Since `Li^(+)` has the smallest size among alkali metals , therefore , Li-O bond is the strongest and C-O bond is the weakest . As a result , `Li_(2)CO_(3)` decomposers most readily to give `Li_(2)O` and `CO_(2)`. |
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| 14. |
Why do alkali metals have lowest ionisation energy?A. Because of small atomic sizeB. Because of high nuclear chargeC. Because of large atomic sizeD. Because of large atomic number |
| Answer» Correct Answer - C | |
| 15. |
The correct decreasing order of ionisation enthalpy of alkali metals isA. `NagtLigtKgtRb`B. `RbgtNagtKU`C. `LigtNagtKgtRb`D. `KgtLigtNagtRb` |
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Answer» Correct Answer - c The correct decreasing order of ionisation entalpy of alkali metals are as follows. `LigtNagtKgtRb` |
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| 16. |
Which of the following alkali metal is having least melting point ?A. NaB. KC. RbD. Cs. |
| Answer» As the size of the metal increases , the strength of metallic bonding decreases and hence its melting point decreases . Since the size of Cs is the biggest , therefore , its melting point is the lowest .Thus , option (d) is correct . | |
| 17. |
The correct decreasing order of ionisation enthalpy of alkali metals isA. `Na gt Li gt K gt Rb`B. `Rb lt Na lt K lt Li`C. `Li gt Na gt K gt Rb`D. `K lt Li lt Na lt Rb` |
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Answer» Correct Answer - C Is the correct answer |
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| 18. |
For two ionic solids CaO and KI , identify the wrong statement among the following ?A. Lattice energy of CaO is much higher than that of KIB. KI is soluble in benzeneC. CaO has high m.p.D. KI has high m.p. |
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Answer» Correct Answer - D Due to lower lattice energy of KI as compared to that of CaO , the m.p. of KI is much lower than that of CaO . |
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| 19. |
State any one reason for alkaline earth metals having a greater tendency to form complexes than alkali metals . |
| Answer» Because of smaller size and higher charge on alkaline earth metal cations as compared to the corresponding alkali metal cations , alkaline earth metal cations have a greater tendency to form complexes . | |
| 20. |
A metal M readily forms its sulphate `MSO_(4)` which is water soluble. It forms oxide `MO` which becomes inert on heating. It forms insoluble hydroxide which is soluble in `NaOH`. The metal `M` is:A. `Mg`B. `Ba`C. `Ca`D. `Be` |
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Answer» Correct Answer - D `BeSO_(4)` and `MgSO_(4)` are soluble in water. Only `BeO` is amphoteric and thus, reacts with `NaOH`. |
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| 21. |
Two metals `(A)` and `(B)` belong to the same group of the periodic table. Metal `(A)` forms and insoluble oxide but a soluble sulphate, metal `(B)` forms a soluble oxide but an insoluble oxide but an insoluble sulphate. Both metals `(A)` and `(B)` form hydroxides which are soluble in alkalis. `(A)` and `(B)` areA. `X =Br, Y =Ba`B. `X=Mg, Y =Ca`C. `X=Ca, Y=Sr`D. `X=Ba, Y=Mg` |
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Answer» Correct Answer - A `BeO-` Insoluble, `BeSO_(4)-` Soluble `BaO-` Soluble, `BaSO_(4)-` Insoluble `Be (OH)_(2)-` Soluble in NaOH `Ba (OH)_(2)-` Insoluble in NaOH |
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| 22. |
Which of following equality with `NaCI`A. `Na(s)`B. `CI_(2)(s)`C. `RbBr(s)`D. `NaI_(3)(s)` |
| Answer» Correct Answer - C | |
| 23. |
A certain compound (A) imparts a golden yellow flame and exhibits following reactions: (a). When a concentrated solution of (A) is boiled with Zn powder, hydrogen gas is evolved. (b). When an aqueous solution of (A) is added to an aqueous solution of stannous chloride, a white precipitate is obtained, which dissolves in excess of solution (A). Identify (A) and give equations for reactions in (a) and (b).A. `{:(" "X," "Y," "Z), (NaOH, Na_(2)CO_(3) , NaHCO_(3)):}`B. `{:(" "X," "Y," "Z), (HCl, NaOH, NaHCO_(3)):}C. `{:(" "X," "Y," "Z), (KOH, K_(2)CO_(3), KHCO_(3)):}`D. `{:(" "X," "Y," "Z), (NaCl, Na_(2)CO_(3), NaOH):}` |
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Answer» Correct Answer - A `Zn+ underset(X)(2NaOH) to Na_(2) ZnO_(2)+ H_(2)` `underset(X) (2NaOH) + CO_(2) to underset(Y) (na_(2) Co_(3))+ H_(2)O` `underset(X)(Na_(2) CO_(3))+ HCl to underset(Z)(NaHCO_(3)) + NaCl` `underset(Y) (Na_(2) CO_(3))+ CO_(2) +H_(2)O to underset(Z) (2Na HCO_(3))` |
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| 24. |
Lithophone is a combination of `ZnS` andA. `PbSO_(4)`B. `CaSO_(4)`C. `SrSO_(4)`D. `BaSO_(4)` |
| Answer» Correct Answer - D | |
| 25. |
Which of the following elements does not form hydride by direct heating with dihydrogen ?A. BeB. MgC. SrD. Ba |
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Answer» Correct Answer - A Being least reactive , Be does not form hydride by direct heating it with dihydrogen . |
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| 26. |
Sodium is heating in air at `350^(@)C` to form A. compound A when reacts with carbon dioxide forms sodium carbonae and Y. Here, Y isA. hydrogen peroxideB. hydrogenC. ozoneD. oxygen |
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Answer» Correct Answer - d `Na+O_(2)overset(350^(@)C)rarrNa_(2)O_(2)` `2Na_(2)O_(2)+2CO_(2)rarr2Na_(2)CO_(3)+O_(2)` |
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| 27. |
Sodium when heated in air at `350^(@)C` forms compound X.X obsorbs `CO_(2)` and liberates Y.Y isA. `H_(2)`B. `O_(2)`C. `H_(2)O_(2)`D. `NH_(3)` |
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Answer» Correct Answer - B |
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| 28. |
A colourless salt X has 50% `Na_(2)SO_(3)` and 50% `H_(2)O` . How much of `SO_(2)` at NTP is obtained when 2.52 g of X reacts with excess of dil . `H_(2)SO_(4)` ?A. 22.4 LB. 0.448 LC. 44.8 LD. 0.224 L |
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Answer» Correct Answer - D In salt (X)=`underset(50%)(Na_(2)SO_(3)):underset(50%)(H_(2)O)` Molar mass of the `Na_(2)SO_(3)=126` Molar mass of the `H_(2)O=18` Hence , 7 molecules of water are attached with `Na_(2)SO_(3)` `therefore ` Formula =`Na_(2)SO_(3)*7H_(2)O` `126:18xx 7 implies 126:126implies 1:1` `Na_(2)SO_(3)*7H_(2)O + H_(2)SO_(4)(aq) to SO_(2)(aq) + Na_(2)SO_(3)(aq) + H_(2)O(l)` `because 252 g Na_(2)SO_(3)* 7H_(2)O ` gives `=22.4L SO_(2)` `therefore 2.52 g Na_(2)SO_(3) *7H_(2)O` will give `=(22.4)/(252)xx252=0.224 L` |
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| 29. |
Sodium is heating in air at `350^(@)C` to form A. compound A when reacts with carbon dioxide forms sodium carbonae and Y. Here, Y isA. hydrogen peroixdeB. hydrogenC. ozoneD. oxygen |
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Answer» Correct Answer - D `2Na+ O_(2) overset(350^(@)C)to Na_(2)O_(2)` `2Na_(2)O_(2)+2CO_(2) to 2Na_(2)CO_(3) + underset(Y) (O_(2))` |
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| 30. |
Element A burns in nitrogen to give an ionic compound B. Compound B reacts with water to give C and D. The solution of C becomes milky on bubbling carbon dioxide . The element A isA. LiB. MgC. CaD. Be |
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Answer» Correct Answer - C Carbon dioxide turns only lime water milky. Thus. The compound C must be `Ca(OH)_(2)` and the element A must be Ca. The reactions are as follows. `underset(A) (3Ca) + N_(2) to underset(B)(Ca_(3)N_(2))` `underset(B)(Ca_(3)N_(2))+ 6H_(2)O to underset(C)(3Ca(OH)_(2))+ underset(D) (2NH_(3))` `underset(C)(Ca(OH)_(2)) + CO_(2) to underset("Milky")(CaCO_(3)) + H_(2)O` |
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| 31. |
Element (A) burns in nitrogen to give an ionic compound, `(B)` reacts with water to give (C) and (D). A solution of (C) becomes milky on bubbling carbon dioxide. Idendity (A),(B),(C) and (D)A. LiB. MgC. caD. Be |
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Answer» Correct Answer - c Carbon dioxide turns only lime water milky. Thus , the compound C must be `Ca(OH)_(2)` and the element A must be Ca. the reactions are as follows: `3Ca+N_(2)rarrCa_(3)N_(2)` `Ca_(3)N_(2)+6H_(2)Orarr3Ca(OH)_(2)+2NH_(3)` `Ca(OH)_(2)+CO_(2)rarrCaCO_(3)+H_(2)O` |
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| 32. |
Magnesium reacts with an element (X) to form an ionic compound . If the ground state electronic configuration of (X) is `1s^(2) 2s^(2) 2p^(3)` , the simplest formula of this compound isA. `Mg_(2)X_(3)`B. `MgX_(2)`C. `Mg_(2)X`D. `Mg_(3)X_(2)` |
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Answer» Correct Answer - D `Mg^(2+) X^(+3) ` i.e., `Mg_(3)X_(2)` Thus , option (d) is correct . |
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| 33. |
Assertion (A): magnesium is not present in enamel of human teeth. Reason (R ): Magnesium is an essential elements for biological functions of human beings.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - B Both are facts. Calcium is present in enamel of teeth. |
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| 34. |
Assertion . Mg is not present in enamel of human teeth . Reason . Mg is an essential element for biological functions of human .A. If both assertion and reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is falseD. If both assertion and reason are false. |
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Answer» Correct Answer - b Correct explanation . Human teeth is made up of hydroxyapatite , `Ca_(5)(PO_(4))_(3)OH` with enamel made up of fluoropatite , `3Ca_(3)(PO_(4))_(2). CaF_(2)`. |
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| 35. |
The metallic lustre exhibited by sodium is explained byA. diffusion of sodium ionsB. oscilations of loose electronsC. excitation of free protonD. existence of body central cubic lattice |
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Answer» Correct Answer - B Metallic lustre is due to oscillation of loose electrons. |
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| 36. |
A chemical A is used for the preparation of washing soda to recover ammonia. When `CO_(2)` is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature what is the chemical formula of A?A. `Ca(HCO_(3))_(2)`B. `CaO`C. `Ca(OH)_(2)`D. `CaCO_(3)` |
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Answer» Correct Answer - C Chemical formula of A is `Ca(OH)_(2)` , i.e. calcium hydroxide. |
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| 37. |
A chemical A is used for the preparation of washing soda to recover ammonia. When `CO_(2)` is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature what is the chemical formula of A?A. `Ca(HCO_(3))_(2)`B. `CaO`C. `Ca(OH)_(2`D. `CaCO_(3)` |
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Answer» Correct Answer - C Is the correct answer |
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| 38. |
A chemical A is used for the preparation of washing soda to recover ammonia. When `CO_(2)` is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature what is the chemical formula of A?A. `Ca(HCO_(3))_(2)`B. `Ca(OH)_(2)`C. `CaCO_(3)`D. None of these |
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Answer» Correct Answer - c For the recover of ammonia, `Ca(OH)_(2)` is used during the preparation of washing soda. |
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| 39. |
A fire work gave brick red coloured flashes. It containsA. NaClB. `BaCl_(2)`C. `CaCl_(2)`D. `SrCl_(2)` |
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Answer» Correct Answer - 3 |
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| 40. |
Amongst the metal Be, Mg, Ca and Sr of group 2 of the periodic table, the least ionic chloride would be formed byA. BeB. MgC. CaD. Sr |
| Answer» Correct Answer - A | |
| 41. |
Why does beryllium show similarities with aluminium ? |
| Answer» Due to same electronegativity `(1*5)` and very similar polarizing power i.e., charge/ionic size `(Be^(2+) = 0*064` and `Al^(3+) = 0*060)` of their ions . | |
| 42. |
Which of the substances can be used for drying neutral or basic gases ?A. Calcium carbonateB. Sodium carbonateC. Sodium bicarbonateD. Calcium oxide . |
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Answer» Correct Answer - D CaO being a dehydrating agent and basic in nature , is used for drying neutral or basic gases , i.e., `NH_(3)`. |
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| 43. |
What are products formed, when powdered beryllium burns on ignition in air ?A. BeO onlyB. `Be_(3)N_(2)` onlyC. BeO and `Be_(3)ON_(2)`D. Become red hot and starts glowing |
| Answer» Correct Answer - C | |
| 44. |
Beryllium is placed above magnesium in the `II` group. Beryllium dust, therefore, when added to `MgCl_(2)` solution will:A. Have no effectB. Precipitates Mg metalC. Leads to the dissolution of Be metalD. Form A complex |
| Answer» Correct Answer - A | |
| 45. |
Beryllium and aluminium have similar properties becauseA. they belong to same groupB. they have same chargeC. they have similar electronic configurationD. They have same polarizing power |
| Answer» Correct Answer - D | |
| 46. |
In hydroysis, the alkali metal oxdes, peroxides and superoxides act asA. Lewis baseB. Lewis acidC. Bronsted acidD. Bronsted base |
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Answer» Correct Answer - D |
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| 47. |
On heating a mixture of one mole each of `Li_(2)CO_(3),MgCO_(3)` and `Na_(2)CO_(3),` the volume of `Co_(2)` evolved under STP conditions will beA. 67.2 LB. 33.6 LC. 44.8 LD. 22.4 L |
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Answer» Correct Answer - C |
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| 48. |
In context with beryllium , which one of the following statements is incorrect ?A. It is rendered passive by nitric acidB. It forms `Be_(2)C`C. Its salts rarely hydrolyzeD. Its hydride is electron-deficient and polymeric . |
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Answer» Correct Answer - C Due to small size and high hydration enthalpy Be compounds readily hydrolyse . |
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| 49. |
The most efficient method of extraction of beryllium isA. Reduction of beryllium halide with magnesiumB. Reaction of beryllium oxide with magnesiumC. Electrolysis of fased beryllium chlorideD. All the above |
| Answer» Correct Answer - C | |
| 50. |
Beryllium shows diagonal relationship with aluminum . Which of the following similarity is incorrect?A. `Be_(2)C`Like `Al_(4)C_(3)` Yelds methane on hydrolysisB. Be like Al is rendered passive by `HNO_(3)`C. `Be(OH)_(2)`Like `Al(OH)_(3)` is basicD. Be forms beryllates and Al forms aluminates |
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Answer» Correct Answer - 3 |
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