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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.
| 651. |
Given : For the species : `I^(-),Ag,Cl^(-),Li,Na,` choose the correct order of reducing strength :A. `LiltNaltI^(-)ltAgltCl^(-)`B. `LiltNaltAgltCl^(-)ltI^(-)`C. `LigtNagtI^(-)gtAggtCl^(-)`D. `LigtNagtAggtCl^(-)gtI^(-)` |
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Answer» Correct Answer - C Based on `E^(@)` values. |
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| 652. |
The blue colour of the solution (metal dissolved in liquid ammonia) is due to :A. free electronsB. paramagnetic nature of solutionC. ammoniated electronsD. liberation of hydrogen from solution on standing |
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Answer» Correct Answer - C Ammoniated `e^(-)` absorbs energy in the visible region of light and thus imparts blue colour to the solution. `M+(x+y)NH_(3)rarr[M(NH_(3))_(x)]^(+)+[e(NH_(3))_(y)]^(-)` `M_((am))^(+)+e^(-)NH_(3)(l)rarrMNH_(2(am))+(1)/(2)H_(2)(g)` |
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| 653. |
Which monoxide of alkali metals is slowly hydrolysed ?A. `Li`B. `Na`C. `K`D. `Cs` |
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Answer» Correct Answer - A This is due to the high lattice energy of `Li_(2)O` as compared to the monoxide of `Na` and others. |
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| 654. |
Which of the following is hydrolysed to the maximum extent ? A. `Mg(NO_(3))_(2)`B. `Be(NO_(3))_(2)`C. `Ca(NO_(3))_(2)`D. `Ba(NO_(3))_(2)` |
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Answer» Correct Answer - D |
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| 655. |
Which of the following is different from other three oxides?A. `Cr_(2)O_(3)`B. `MgO`C. SnOD. ZnO |
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Answer» Correct Answer - b MgO is basic while other three are ampoteric oxides. |
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| 656. |
The compound B and C are : A. `Na_(2)CO_(3), Na_(2)SO_(4)`B. `NaHCO_(3), Na_(2)SO_(4)`C. `Na_(2)CO_(3), Na_(2)SO_(3)`D. All of these |
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Answer» Correct Answer - C |
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| 657. |
For the equilibrium `LiCl.3NH_(3(s))harrLiCl.NH_(3(s))+2NH_(3(g))` `[K_(p)=9atm^(2)]`. At `0^(@)`C. A 44.8 litre vessel contains 1 mole of `LiCl.3NH_(3)`. How many mole of `NH_(3)` shoul be added to the flask at this temperature to drive the backward reaction to almost completion? |
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Answer» Correct Answer - 2 |
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| 658. |
On heating magnesium sulphate, the following changes takes places: `MgSO_(4).7H_(2)O overset( 150^(@)C) rarr MgSO_(4).xH_(2)O` `overset (200^(@)C) rarr MgSO_(4). yH_(2)O` the sum of x and y is : |
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Answer» Correct Answer - 1 |
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| 659. |
`BeO_(2) + H_(2)SO_(4) to` |
| Answer» `Na_(2)O_(2) + 2H_(2)O_(2) to H_(2)O_(2) + H_(2)O_(2)` | |
| 660. |
`Na_(2)O_(2) + H_(2)SO_(4) to` |
| Answer» `Na_(2)O_(2) + H_(2)SO_(4) to Na_(2)SO_(4) + H_(2)O_(2)` | |
| 661. |
`Na_(2)O_(2) + H_(2)O to` |
| Answer» `Na_(2)O_(2) + 2H_(2)O_(2) to H_(2)O_(2) + 2NaOH` | |
| 662. |
Which of the following statement is incorrect for `Na_(2)O_(2)`?A. It absorbs `CO_(2)`B. At room temperature it produces `O_(2)` with waterC. It produces `NO_(2)` with `NH_(3)`D. It converts green solution of `Cr^(+3)` to yellow solution |
| Answer» Correct Answer - C | |
| 663. |
The substances used as an antichlor in bleaching isA. `Na_(2) S_(2)O_(3)`B. `NaOH`C. `Na_(2)SO_(4)`D. `NaCl` |
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Answer» Correct Answer - A `Na_(2) S_(2) O_(3), H_(2)O_(2), Na_(2) SO_(3), ` etc. can be used to remove excess of `Cl_(2).` |
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| 664. |
Li , Na and K react with dioxygen giving ……… , ………and …………respectively . |
| Answer» `Li_(2)O , Na_(2)O_(2) , KO_(2)` | |
| 665. |
`Yoverset(Delta,250^(@)C)rarrCaSO_(4).2H_(2)Ooverset(Delta,120^(@)C)rarrX.` X and Y are respectively :A. plaster of Paris, dead burnt plasterB. dead burnt plaster, plaster of ParisC. CaO and plaster of ParisD. plaster of Paris, mixture of gases |
| Answer» Correct Answer - A | |
| 666. |
Digonal relationship is shown by the elementsA. Be and MgB. Li and NaC. Li and MgD. Be and Ba |
| Answer» Correct Answer - C | |
| 667. |
Choose the correct statements from the following .A. Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal .B. Beryllium sulphate is readily soluble in water as the greater hydration enthalpy of `Be^(2+)` overcomes the lattice enthalpy factor .C. Beryllium exhibits coordination number more than four .D. Beryllium oxide is purely acidic in nature . |
| Answer» Correct Answer - A::B | |
| 668. |
Which of the following is correct ?(i) Lithium is better reducing agent than sodium (ii) Sodium is better reducing agent than potassium (iii) Rubidium is better reducing agent than sodium (iv) The Rubidium is better reducing agent than lithiumA. all are correctB. I,ii & iv onlyC. I,iii & iv onlyD. I,ii & iii only |
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Answer» Correct Answer - C |
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| 669. |
Select the correct statements (i) Alkali metals from alloys amongest themselves (ii) Alkali metals dissolve readily in mercury (iii) The process of formation of amalgams by alkali metals is highly exothermic (iv) The process of formation f amalgam by alkali metals is highly endothermicA. All are correctB. I,ii & iv onlyC. I,iii & iv onlyD. I,ii & iii only |
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Answer» Correct Answer - B |
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| 670. |
Trona is a natural hydrated mixed compound of sodium found in nature. In one molecule, how many sodium bicarbonate molecules are present ?A. 4B. 3C. 1D. 2 |
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Answer» Correct Answer - C |
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| 671. |
Acetylene can be prrepared by ading water toA. Lime stoneB. Quick limeC. Calcium carbideD. Hydrolith |
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Answer» Correct Answer - 3 |
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| 672. |
Soda lime is a mixture ofA. `Na_(2)SO_(4)+CaO_(3)`B. `NaOH+NaHCO_(3)`C. NaOH+CaOD. `NaH+Na_(2)CO_(3)` |
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Answer» Correct Answer - C |
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| 673. |
A mixture of slaked lime, send and water known asA. Port land cementB. Lime mortarC. Milk of limeD. Albaster |
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Answer» Correct Answer - 2 |
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| 674. |
Mixture of lime stone end clay when heated formsA. Hydraclic moralB. MoltalC. Cement mortalD. All |
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Answer» Correct Answer - 1 |
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| 675. |
Which of the following is not a characteristic of alkali metals ?A. Low m.pB. High ionization energyC. Low electronegativityD. Their ion are isoelectronic with noble gases |
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Answer» Correct Answer - B |
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| 676. |
Which of the following statement(s) is / are correct?A. The chloride of Be is electron deficient and is polymeric with halogen bridges.B. The reaction of CaO, SrO and BaO with water is exothermic.C. The bicarbonates of alkaline earth metals are only stable in solutions.D. `BeF_(2)` is very soluble in water owing the high solvation energy of `Be^(2+)` but fluorides of other alkaline earth metals are almost insoluble |
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Answer» Correct Answer - A::B::C::D |
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| 677. |
The radius of which of the following hydrate ion is smallest?A. `[Li(H_(2)O)_(n)]^(+)`B. `[Na(H_(2)O)_(n)]^(+)`C. `[Cs(H_(2)O)_(n)]^(+)`D. `[Li(H_(2)O)_(n)]^(+)` |
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Answer» Correct Answer - D |
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| 678. |
Which of the following potassium compounds is known as "Pearl ash"A. `KOH`B. `KMnO_(4)`C. `K_(2)CO_(3)`D. `K_(2)SO_(4)` |
| Answer» Correct Answer - C | |
| 679. |
The sodium chloride is used in the manufacture of -A. `CI_(2)`B. `NaOH`C. `Na_(2)CO_(3)`D. All of these |
| Answer» Correct Answer - D | |
| 680. |
The formula of soda ash isA. `Na_(2)CO_(3). 10 H_(2)O`B. `Na_(2)CO_(3).2H_(2)O`C. `Na_(2)CO_(3). H_(2)O`D. `Na_(2)CO_(3)` |
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Answer» Correct Answer - D Anhydrous `Na_(2)CO_(3)` is called soda ash while sodium carbonate decahydrate , i.e., `Na_(2)CO_(3). 10 H_(2)O` is called washing soda . |
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| 681. |
Which of the following process is used in the extractive metallurgy of magnesium ?A. Fused salt electrolysisB. Self- reductionC. aqueous solution electrolysisD. Thermite reduction |
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Answer» Correct Answer - A Highly electropositive metals `(e.g.,` alkali and alkaline earth metals and `Al)` are extracted by the electrolysis of their fused salts. Cathode `: Mg^(2+)+2e rarr Mg` Anode `: 2Cl^(-) rarr Cl_(2)+2e` |
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| 682. |
Which of the following is used as a scavenger in metallurgy ?A. BeB. MgC. CaD. Sr |
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Answer» Correct Answer - C Ca is used as a scavenger for P, O and S in metallurgy. |
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| 683. |
Electronic configuration of alkaline earth metal isA. `(n-1) s^(2) (n-1) p^(6) (n-1) d^(5) ns^(2)`B. `(n-1) s^(2) (n-1) p^(6) (n-1) d^(10) ns^(2)`C. `(n-1) s^(2) (n-1) p^(6) (n-1) d^(2) ns^(2)`D. `(n-1) s^(2) (n-1) p^(6) (n-1) ns^(2)` |
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Answer» Correct Answer - 4 |
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| 684. |
Match the following : |
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Answer» Correct Answer - A-rt ; B-pt ; C-s ; D-qt |
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| 685. |
Match the chemical properties with the compounds: |
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Answer» Correct Answer - A-pqs ; B-pqr ; C-qr ; D-qrs |
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| 686. |
Radium is polaced at the bottom of alkaline earth metals. The element shouldA. Have the highest atomic volumeB. Possess the miniumum densityC. Be less easily ionizableD. Be least electropositive |
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Answer» Correct Answer - 1 |
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| 687. |
Among the alkaline earth elemets, element ranking 5th in abundance in the earth crust isA. MgB. CaC. BeD. Ba |
| Answer» Correct Answer - B | |
| 688. |
Among the alkaline earth elements, element ranking 6th inabundance in the earth crust isA. MgB. CaC. SrD. Be |
| Answer» Correct Answer - A | |
| 689. |
Statement-1: `MgCO_(3)` is soluble in water when a current of `CO_(2)` is passed. Statement-2: The solubility of `MgCO_(3)` is due to the formation of `Mg(HCO_(3))_(2)`.A. Statement-1 is True, Statement-2 is True. Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
| Answer» Correct Answer - A | |
| 690. |
Several sodium compounds find use in industries. Which of the following compounds are used for textile industry?A. `Na_(2)CO_(3)`B. `NaHCO_(3)`C. `NaOH`D. `NaCl` |
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Answer» Correct Answer - A::C Both `Na_(2)CO_(3)(a)` and NaOH (c ) are used in textile industry |
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| 691. |
Which of the following compounds are readily soluble in water?A. `BeSO_(4)`B. `MgSO_(4)`C. `BaSO_(4)`D. `SrSO_(4)` |
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Answer» Correct Answer - A::B `BeSO_(4)` (a) and `MgSO_(4)` (b) are readily soluble in water solubility of sulphates of group two (ii) elements decreases down the group. |
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| 692. |
Which of the following properties of elements of alkaline earth metal does not increase with increasing atomic number ?A. Solubility of hydroxideB. Reactivity with waterC. `I^(st)` Ionisation enthalpyD. Stability of carbonate |
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Answer» Correct Answer - 3 As we move down the group of alkaline earth metal the size of atom increases so `1^(st)` ionisation enthalpy decreases. |
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| 693. |
Calcium is obtained by theA. electrolysis of molten `CaCl_(2)`B. electrolysis of solution of `CaCl_(2)` in waterC. reduction of `CaCl_(2)` with carbonD. roasting of limestone |
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Answer» Correct Answer - A |
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| 694. |
Calcium is obtained by theA. roasting of lime stoneB. reduction of `CaCl_(2)` with carbonC. electrolysis of a solution of `CaCl_(2)` in waterD. electrolysis of molten `CaCl_(2)` |
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Answer» Correct Answer - D `CaCl_(2) rarr underset("Cathode")(Ca^(+2))+underset("Anode")(2Cl^(-))` Cathode :` Ca^(+2)+2e^(-)rarr Ca` Anode : `2C^(-) rarr 2 e^(-)+Cl_(2)` |
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| 695. |
Calcium is obtained by theA. Roasting of limestoneB. Reduction of `CaCl` with carbonC. Electrolysis of a solution of `CaCl_(2)` in waterD. Electrolysis of molten `CaCl_(2)` |
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Answer» Correct Answer - D `CaCl_(2) rarr underset("Cathode")(Ca^(+2))+underset("Anode")(2Cl^(-))` Cathode : `Ca^(+2)+2e^(-)rarr Ca` Anode `: 2C^(-) rarr 2 e^(-)+Cl_(2)` |
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| 696. |
Calcium is obtained by-A. Roasting of lime stoneB. Electrolysis of calcium chloride in `H_(2)O`C. Reduction of calcium chloride with CarbonD. Electrolysis of molten anhydrous calcium chloride |
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Answer» Correct Answer - D `CaCI_(2)` (molten) `overset("Electrolysis")rarr underset("Cathode Ca")underset(darr)(Ca^(2+)+CI^(-))` |
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| 697. |
On passing excess of `CO_(2)` in lime water, its milky appearance disappears because-A. Soluble `Ca(OH)_(2)` is formedB. Soluble `Ca(HCO_(3))_(2)` is formedC. Reaction becomes reversibleD. Calcium compound evaporated |
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Answer» Correct Answer - B `Ca(OH)_(2)+CO_(2)rarrunderset("Milkiness disappear")underset(Ca(HCO_(3))_(2)+"soluble")underset(darr"Excessive CO_(2))(CaCO_(3)darr+H_(2)O)` |
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| 698. |
Which of the following ions forms a hydoxide that is highly soluble in water?A. `K^(+)`B. `Zn^(2+)`C. `Ni^(2+)`D. `AI^(3+)` |
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Answer» Correct Answer - A Solubility of hydroxide (of s-block) `prop (1)/(L.E.)` |
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| 699. |
Which of the following statements is true for all the alkali metals ?A. Their nitrates decomposes on heating to give the corresponding nitrites and oxygen.B. Their chlorides crystallise as hydratesC. They react with water to form hydroxide and hydrogenD. They readily react with halogens to form ionic halides, `M^(+)X^(-)`. |
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Answer» Correct Answer - 3 `(1)4LiNO_(2)rarr2Li_(2)O+4NO_(2)+O_(2)` `2NaNO_(3)rarr2NaNO_(2)+O_(2)(` similar decomposition with the nitrates of `K,Rb` and `Cs)` `(2)` Only `LiCl` is deliquescent and crystallises as a hydrate `LiCl.2H_(2)O` `(3) 2M+2H_(2)Orarr2M^(+)+2OH^(-)+H_(2)(M=` an alkali metal ) `(4)` Halides of `Li` are covalent in nature. |
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| 700. |
A solution of sodium in liquid ammonia serves as a good reducing agent due to the reaction.A. `2Na+2NH_(3)rarr2NaNH_(2)+H_(2)`B. `NaNH_(2)+NO_(2)toNaN_(3)+H_(2)O`C. `2Na+2H_(2)Oto2NaOH+H_(2)`D. Solvvated electron |
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Answer» Correct Answer - D |
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