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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.
| 701. |
Amongest the alkali metal hydrides, the most stable one isA. LiHB. NaHC. KHD. RbH |
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Answer» Correct Answer - A |
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| 702. |
What are the products formed when `Li_(2)CO_(3)` undergoes decomposition?A. `Li_(2)O_(2)+CO`B. `Li_(2)O+CO`C. `Li_(2)O+CO`D. `LiO_(2)+CO` |
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Answer» Correct Answer - C |
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| 703. |
Aqueous solution of sodium carbonate can react with :A. `MgCl_(2)`B. `Ca(HCO_(3))_(2)`C. `H_(2)SO_(4)`D. `CO_(2)` |
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Answer» Correct Answer - A::B::C::D |
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| 704. |
Which one of the following does not produce metallic sulphide with `H_(2)S`?A. `Na_(2)SO_(4)`B. `MgSO_(4)`C. `BaSO_(4)`D. `Li_(2)SO_(4)` |
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Answer» Correct Answer - A::C |
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| 705. |
What are the products formed when `Li_(2)CO_(3)` undergoes decomposition?A. `Li_(2)O_(2) + CO`B. `Li_(2)O + CO`C. `Li_(2)O + CO_(2)`D. `LiO_(2) + CO` |
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Answer» Correct Answer - C |
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| 706. |
`RbO_(2)` isA. peroxide and paramagneticB. peroxide and diamagneticC. superoxide and paramagneticD. superoxide and diamagnetic |
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Answer» Correct Answer - C Superoxides and paramagnetic . |
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| 707. |
Which of the following elements form peroxides when heated in excess of air ?A. KB. NaC. BaD. Ca |
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Answer» Correct Answer - B::C::D K forms superoxide , `KO_(2)` while others form peroxides . |
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| 708. |
Which of the following statements is false ?A. `Ca^(2+)` ions are not important in maintaining the regular beating of the heartB. `Mg^(2+)` ions are important in the green parts of the plantsC. `Mg^(2+)` ions form a complex with ATPD. `Ca^(2+)` ions are important in blood clotting . |
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Answer» Correct Answer - A `Ca^(2+)` maintain the regular beating of the heart . |
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| 709. |
Among the following compounds of cement which is present in the highest amount ?A. `Ca_(2)SiO_(4)`B. `Ca_(3) SiO_(5)`C. `Al_(2)O_(3)`D. `Ca_(3)Al_(2)O_(6)` |
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Answer» Correct Answer - B `Ca_(3) SiO_(5) `(51%) |
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| 710. |
The compound which is not associated with Solvay ammonia process for the production of `Na_(2)CO_(3)`:A. `NH_(4)HCO_(3)`B. `NaHCO_(3)`C. `NaCl`D. `Na_(2)C_(2)O_(4)` |
| Answer» Correct Answer - D | |
| 711. |
Nitrogen dioxide cannot be prepared by heating :A. `KNO_(3)`B. `AgNO_(3)`C. `Pb(NO_(3))_(2)`D. `Cu(NO_(3))_(2)` |
| Answer» Correct Answer - A | |
| 712. |
The formula of Norwiegin saltpethree is:A. `NaNO_(3)`B. `KHO_(3)`C. `Ca(NO_(3))_(2)CaO`D. `Ba(NO_(3))_(2)` |
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Answer» Correct Answer - 3 |
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| 713. |
`CO_(2)` cannot be obtained by heatingA. `Na_(2)CO_(3)`B. `CaCO_(3)`C. `Li_(2)CO`D. `Ca(HCO_(3))_(2)` |
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Answer» Correct Answer - A |
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| 714. |
Electric cookers have a coating of thatprotectes them against fire.A. Heavy leadB. Magnesium OxideC. Zinc oxideD. Sodium sulphate |
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Answer» Correct Answer - 2 |
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| 715. |
Electric cookers have a coating that protects them against firer. The coating is made ofA. Heavy leadB. Magnesium oxideC. Zinc oxideD. Sodium sulphate |
| Answer» Correct Answer - B | |
| 716. |
Which of the following sets can be called isoelectronic species ?A. `Na^(+), Mg^(+)`B. `NA, Mg^(+)`C. Na, MgD. `Na, Mg^(++)` |
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Answer» Correct Answer - B `""_(11)Na=1s^(2) 2s^(2) 2p^(6) 3s^(1),""_(12)Mg^(+)=1s^(2) 2s^(2) 3p^(6) 3s^(1)` |
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| 717. |
Which of the following properties is not true for an alkali metal ?A. Low atomic volumeB. Low inization enthalpyC. Low densityD. Low electronegativity |
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Answer» Correct Answer - A Inany period, alkali metal (except noble gas) has the lowest density. Therefore, alkali metals have large atomic volumes. |
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| 718. |
which of the following salt is present in teth?A. Milk of magnesiaB. HydroxyapatiteC. Barium suspensionD. None of these |
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Answer» Correct Answer - 2 |
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| 719. |
Which of th following is true ?A. sodium when heated in excess of oxygen it gives sodium oxide.B. oxidation state of oxygen in `KO_(2)` is -1C. sodium amalgam is better reducing agent than hydrogen.D. sodium nitrate on heating gives nitrogen dioxide. |
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Answer» Correct Answer - C |
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| 720. |
Which of the following law states that "good absorbers of heat are good emitters"A. `Ca^(2+)`B. 0C. `Ba^(2+)`D. `sr^(2+)` |
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Answer» Correct Answer - 3 |
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| 721. |
Solid NaCl is a bad conductor of electricity sinceA. solid NaCl there are no ionsB. in solid NaCl these are no ionsC. in solid NaCl there are no electronsD. in solid NaCl, the `Na^(+) and Cl^(-)` ions strongly attracted by one another and hence there is no net velocity of ions |
| Answer» Correct Answer - D | |
| 722. |
Which of the following is the weakest base ?A. `Ca(OH)_(2)`B. `KOH`C. `LiOH`D. `Sr(OH)_(2)` |
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Answer» Correct Answer - A LiOH is the weakest base since Li is most electronegative among `K^(+) , Na^(+) , Mg^(2+) , Ca^(2+)`. |
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| 723. |
Which of the following is the strongest base ?A. NaOHB. KOHC. `Ca(OH)_(2)`D. `Mg(OH)_(2)` |
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Answer» Correct Answer - C KOH is the strongest base since K is most electropositive . |
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| 724. |
`MgCl_(2).6H_(2)O` on heating gives anhydrous `MgCl_(2)` |
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Answer» Correct Answer - F |
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| 725. |
Which of the following act as an oxidising as well as reducing agent?A. `Na_(2)O`B. `NaO_(3)`C. `NaNO_(3)`D. `NaNO_(2)` |
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Answer» Correct Answer - D |
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| 726. |
`MgCl_(2).6H_(2)O` on heating gives anhydrous `MgCl_(2)`.A. Magnesium oxideB. Magnesium oxychlorideC. Magnesium dichlorideD. Magnesium chloride |
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Answer» Correct Answer - C We know that `MgCl_(2).6H_(2)O overset(Heat) rarr MgCl_(2)+6H_(2)O` Thus in this reaction magnesium dichloride is produced. |
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| 727. |
Leat abundant occuring element among alkali metals isA. LiB. RbC. CsD. Fr |
| Answer» Correct Answer - D | |
| 728. |
Property of all the alkali metals that decreases with their atomic number is `//` are I) Solun=bility of their hydroxides II) Thermal stability of their carbonates III) Softness IV) Hydration energyA. III,IVB. II,IVC. I onlyD. IV only |
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Answer» Correct Answer - D |
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| 729. |
When Na and Li placed in dry air we get:-A. `NaOH, Na_(2)O, Li_(2)O`B. `Na_(2)CO_(3),Na_(2)O_(2),Li_(2)O`C. `Na_(2)O, Li_(3)N, NH_(3)`D. `Na_(2)O, Li_(2)O, Li_(3)N` |
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Answer» Correct Answer - D `Na + air rarr Na_(2)O` `Li + air rarr Li_(2)O + Li_(3)N` |
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| 730. |
When Na and Li are placed in dry air, the products obtained areA. `NaOH,Na_(2)oO,Li_(2)O`B. Na_(2)O,Li_(2)O` onlyC. `Na_(2)O,Li_(2)O,Li_(3)N,NH_(3)`D. `Na_(2)O,Li_(3)N,Li_(2)O` |
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Answer» Correct Answer - D |
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| 731. |
Which of the following is not contained by Portland cement?A. `Ca_(3)PO_(4)`B. `CaSiO_(3)`C. `CaSiO_(4)`D. `Ca_(3)Al_(2)O_(6)` |
| Answer» Correct Answer - a | |
| 732. |
Which of the following is not a compound of calcium ?A. ChalkB. GypsumC. Quick limeD. Silica |
| Answer» Correct Answer - D | |
| 733. |
Chemical name of soda ash isA. Sodium carbonateB. Sodium bicarbonateC. Sodium hyroxideD. Sodium chloride |
| Answer» Correct Answer - A | |
| 734. |
Which of the following staement(s) is (are) true?A. LiCl is deliquescent.B. Li is least reactive but the strongest reducing agent amongest all the alkali metals.C. Liquid sodium metal is used as a coolant in fast breeder nuclear reactors.D. Lithium iodide is the most ionic in nature among alkali metal halides. |
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Answer» Correct Answer - A::B::C |
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| 735. |
Mole of hydrocarbon produced by hydrolysis of 1 mole `Mg_(2)C_(3)` (magnesium carbide) |
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Answer» Correct Answer - 1 |
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| 736. |
Which of the following has lowest thermal stability ?A. `Li_(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 - A Thermal stability of alkali metal oxy-acid salts increases with increasing metallic character so `Li_(2)CO_(3)` has lowest stability. |
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| 737. |
Statement - 1 . Sodium metal is softer than potassium metal . Statement-2 . Metallic bonding in potassiumA. 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. |
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Answer» Correct Answer - d Correct statement-1 . Potassium metal is softer than sodium metal . |
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| 738. |
Sodium metabisuphite is not:A. An antichlorB. A bleaching agentC. Wealy basicD. Amphoteric |
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Answer» Correct Answer - C |
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| 739. |
Which of the following oxides have rock salt structure with coordination number `6:6`?A. MgOB. BeOC. CaOD. SrO |
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Answer» Correct Answer - A::C::D |
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| 740. |
Which of the following statement is incorrectA. The atomic radius of Na is greater than that of MgB. Metallic bond is Mg is stronger than the metallic bond in NaC. Melting and boiling points of K are greater than those of NaD. Mg and Ca both impart characteristic colour to the flame. |
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Answer» Correct Answer - C::D |
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| 741. |
On addition of metal ions, colour of liquid `NH_(3)`solutions converts into bronze, the reason is:-A. Ammoniated electronsB. Metal amide formationC. Liberation of `NH_(3)` gasD. Cluster formation of metal ions |
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Answer» Correct Answer - D Cluster formation takes place |
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| 742. |
Regarding alkali metal ions which is incorrect?A. ColouredB. DiamagneticC. Smaller in size then parent atomD. isoelectronic with the nearest inert gases |
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Answer» Correct Answer - A |
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| 743. |
The metallic salt `(XY)` is soluble in water. (a) When the aqueous soluble of `(XY)` is treated with `NaOH` solution, a white precipitate `(A)` is formed. In excess of `NaOH` solution, a white precipitate `(A)` is formed. In excess of `NaOH` solution, white precipitate `(A)` dissolves to form a compound `(B)`. When this solution is boiled with soild `NH_(4) Cl`, a precipitate of compound `(C)` is formed. (b) An aqueous solution on treatment with `BaCl_(2)` solution gives a white precipitate `(D)` white is insoluble in conc `HCl`. ( c) The metallic salt `(XY)` forms a double salt `(E)` with potassium sulphate. Identify `(XY),(A),(B),(C),(D)` and `(E)`.A. M=MgB. M=BeC. `P+Ca(OH)_(2)`D. `G=O_(3)` |
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Answer» Correct Answer - B |
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| 744. |
Which cannot be used to generate `H_(2)`?A. Al+NaOHB. Zn+NaOHC. Mg+NaOHD. LiH+`H_(2)O` |
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Answer» Correct Answer - C |
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| 745. |
A compoud which can be used in space vehicles both to absorb `CO_(2)` and liberate `O_(2)` is:A. `NaOH`B. `Na_(2)O`C. `Na_(2)O_(2)`D. `CaO + NaOH` |
| Answer» Correct Answer - C | |
| 746. |
Nitrate is converted into metal oxide on heating. This metal is:A. `Li`B. `Na`C. `Mg`D. (1) and (3) both |
| Answer» Correct Answer - D | |
| 747. |
Nitrate of an element of alkali metal group, decomposes on heating, gives brown colour gas. Nitrate and brown colour gas are respectively:-A. `NaNO_(3)` and `NO`B. `LiNO_(3)` and `NO_(2)`C. `KNO_(3)` and `NH_(3)`D. `NaNO_(3)` and `NO_(2)` |
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Answer» Correct Answer - B Only `LiNO_(3)` produces red brown vapours of `NO_(2)` |
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| 748. |
Anhydrous brium nitare and mgnesium nitrate both decompose on heating , evolving nitrogen dioxide and oxygen and forming an nitrogen dioxide and oxygen and forming an oxide . Choose the incorrect statement abounta this decompostionA. Nitrogen dioxide is evolved ata a lower temperature from magnesium nitrate then from barium nitrateB. Nittrogen dioxide is evloved at a lower temperature from magnesium nitrate then from magnesium nitateC. For both nitrates the volume of nitrogen dioxide evolved ios four times greather than the volume of oxygen.D. The numerical value of the lattice energyu of magnesium nitrate is greather than thaat of barium nitrate. |
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Answer» Correct Answer - 3 |
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| 749. |
Which of the following hydrated chlorides can not be converted into anhydrous chloride only by heating?A. `MgCl_(2).6H_(2)O`B. `AlCl_(3).6H_(2)O`C. `SnCl_(2).2H_(2)O`D. All of these |
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Answer» Correct Answer - D `MgCl_(2).6H_(2)O,AlCl_(3).6H_(2)O" and "SnCl_(2).2H_(2)O` can not be converted into anhydrous chloride only by heating. Because `Mg^(2+), Al^(3+),Sn^(2+)` ions have more polarization power. `MgCl_(2).6H_(2)OrarrMgO+2HCl+5H_(2)` `2AlCl_(3).6H_(2)OrarrAl_(2)O_(3)+6HCl+9H_(2)O` `SnCl_(2).2H_(2)OrarrSnO+2HCl+H_(2)O` |
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| 750. |
Magnesium oxide can be obtained by heating :-A. `MgCO_(3)`B. `Mg(NO_(3))_(2)`C. `Mg(OH)_(2)`D. All |
| Answer» Correct Answer - D | |