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. |
Bleaching action of Bleaching powder is due to the liberation ofA. `Ocl_2^(2-)`B. `Ocl^(-)`C. `O_2Cl^-`D. `O^(2-)` or (E) `Cl^(-)` |
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Answer» Correct Answer - B The effective component of bleaching powder is `Ocl^(-)` |
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| 2. |
Bleaching powder is obtained by the interaction of `Cl_2` andA. Dry slaked limeB. hot `Ca(OH)_2`C. cold `Ca(OH)_2`D. conc. `CaCl_2` |
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Answer» Correct Answer - A Bleaching powder is obtained by the action of `Cl_2` on dry slaked lime. |
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| 3. |
For two ionic solids, `CaO` and `KI`, which of the following statements is false?A. Lattice energy of CaO is much higher than that of KI.B. KI is soluble in benzeneC. CaO has high m.pD. KI has high m.p |
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Answer» Correct Answer - B KI, an ionic compound is not soluble in benzene. |
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| 4. |
The first ionization 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 metalsB. there is decrease in the nuclear charge of the alkaline earth metalsC. there is no change in the nuclear chargeD. none of the above |
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Answer» Correct Answer - A The first I.Es. Of alkaline earth metals are higher than corresponding alkali metals due to higher nuclear charge. Smaller size and fully filled `ns^2` configuration. |
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| 5. |
A certain metal M is used to prepare an antiacid,which is used as a medicine in acidity. This metal accidently catches fire and it was found that the fire cannot be put out by using `Co_2` based extinguishers. The metal M isA. CaB. CC. MgD. None |
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Answer» Correct Answer - C Both magnesium and calcium fires cannot be put only by using carbon dioxide based extinguishers. However Mg is used for preparing a suspension of `Mg(OH)_2` in water which is used as anti-acid. Hence, the metal M is Mg. |
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| 6. |
When calcium carbide is heated in atmosphere of nitrogen in an electric furnance, the compound formed isA. `Ca(CN)_2`B. `Ca_3N_2`C. `CaNC_2`D. CaNCN |
| Answer» Correct Answer - D | |
| 7. |
Which of the following carbide can be used to prepare methane by its action with water?A. `CaC_2`B. `Be_2C`C. `MgC_2`D. None |
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Answer» Correct Answer - B The carbide of Be i.e., `Be_2C` only gives methane on reaction with `H_2O`. `Be_2C+2H_2Oro2BeO+underset("methane"CH_4` `CaC_2+2H_2OtoCa(OH)_2+C_2H_2` |
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| 8. |
Calcium is obtained by theA. roasting of lime stoneB. electolysis fo solution of calcium chloride in waterC. reduction fo calcium chloride with carbonD. electrolysis fo molten anhydrous or fused calcium chloride. |
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Answer» Correct Answer - D Calcium is obtained by the electrolysis of molten anyhydrous or fused `CaCl_2`. |
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| 9. |
When calcium carbide reacts with `N_2" at "1000^(@)C`, the compound formed isA. `CaCN_2`B. `Ca(CN)_2`C. `Ca_3N_2`D. `Ca(NO_3)_2` |
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Answer» Correct Answer - A `CaC_2+N_2overset(1000^(@)C)tounderset(Nitrolim)CaN_2+C` |
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| 10. |
Calcium carbide is obtained by heatingA. Calcium carbonateB. A mixture of quick lime and cokeC. A mixture of slaked lime and cokeD. none of the above |
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Answer» Correct Answer - B `CaO+3CtoCaC_2+CO` |
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| 11. |
White enamel of our teeth isA. `Ca_3(PO_4)_2`B. `CaF_2`C. `CaCl_2`D. `CaBr_2` |
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Answer» Correct Answer - B The enamel of our teeth is `CaF_2`. |
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| 12. |
Lithophone used as white pigment is a mixture ofA. `CaSO_4+ZnS`B. `BaSO_4+ZnS`C. `BaSO_4+CaSO_4`D. `CaSO_4+ZnS` |
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Answer» Correct Answer - B Lithophone is a mixture `BaSO_4` and ZnS. |
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| 13. |
Dolomite is:-A. KCl.Mg`Cl_2.6h_2O`B. `Na_3AIF_6`C. `CaCO_3.MgCO_3`D. `CaCl_2.MgCl_2.6H_2O` |
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Answer» Correct Answer - C Dolomite is `CaCO_3.MgCO_3` |
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| 14. |
The most efficient method of extraction of beryllium isA. reduction of beryllium halide with magnesiumB. reduction of beryllium oxide with carbonC. electolysis of fused beryllium chlorideD. dissociation of beryllium carbide |
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Answer» Correct Answer - C Electrolysis of the fused beryllium chloride is the best method. |
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| 15. |
Lightest construction metal in industry isA. LithiumB. CalciumC. Aluminium oxideD. Magnesium |
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Answer» Correct Answer - D Magnesium is the lightest construction metal in industry. Its density is less than 2/3 of aluminium. |
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| 16. |
The alloy Electron used in the construction of air crafts has the compositionA. 15% Mg, 85% AlB. 95% Mg, 5% ZnC. 95% Mg, 5% AlD. 80%Mg, 20% Zn |
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Answer» Correct Answer - B 95%Mg + 5% Zn. |
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| 17. |
On heating quicktime with coke in an electric furnace, we getA. Ca and `CO_2`B. `CaCO_3`C. CaOD. `CaC_2` |
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Answer» Correct Answer - D `CaO+3Coverset(Delta//"Electric furnace")tounderset("cal.carbide")CaC_2+O_2uparrow` |
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| 18. |
Which of the following metals is present chlorophyll?A. MagnesiumB. IronC. SodiumD. Beryllium |
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Answer» Correct Answer - A `Mg^(2+)` is present in the chlorophyll, the green colouring pigment of plants. |
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| 19. |
Which of the following metals is present chlorophyll?A. MgB. BeC. CaD. none of these |
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Answer» Correct Answer - A Chlorophyll contains Magnesium. |
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| 20. |
Magnesium can be obtanied byA. Reducing MgO with cokeB. Reducing magnesium salt solution with FeC. Electrolysis of fused magnesium saltD. Electrolysis of `Mg(NO_3)_2` solution |
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Answer» Correct Answer - C Magnesium is obtained by the electrolysis of fused magnesium salt. |
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| 21. |
The metal present in chlorophyll is ______A. ChromiumB. CobaltC. MagnesiumD. Iron |
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Answer» Correct Answer - C Magnesium is present in chlorophyll. |
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| 22. |
Slacked lime is obtained fromA. Lime stoneB. Plaster of ParisC. Quik limeD. Nitrolim |
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Answer» Correct Answer - C `underset("Quick lime")CaO+H_2Otounderset("slaked lime")Ca(OH)_2` |
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| 23. |
Slacked lime is used in the manufacture ofA. CementB. Fire bricksC. PigmentsD. Medicines |
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Answer» Correct Answer - A Cement |
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| 24. |
The alkaline earth metal with least density isA. BeB. MgC. CaD. Sr. |
| Answer» Factual question (see A-Level information). | |
| 25. |
Oxalates of alkaline earth metal, highly soluble in water is that ofA. BeB. SrC. BaD. Ca |
| Answer» Only beryllium oxalate is freely soluble in water. | |
| 26. |
Which of the following alkaline earth metal oxide is most basic?A. BeOB. MgOC. CaOD. BaO |
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Answer» Correct Answer - C Down the group basic character of oxide increases. |
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| 27. |
The alkaline earth metal harder than glassA. BeB. MgC. CaD. none of these |
| Answer» Beryllium is harder than glass. | |
| 28. |
Epsom salt isA. Magnesium sulphateB. Calcium sulphateC. Ferrous ammonium sulphateD. Magnesium ammonium phosphate |
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Answer» Correct Answer - A Epsom salt is `MgSO_4.7H_2O`. |
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| 29. |
Alkaline earth metal oxide not having rock salt structure isA. BeOB. MgOC. CaOD. SrO |
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Answer» Correct Answer - A BeO does not have a rock salt structure. BeO is a covalent compound. |
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| 30. |
which of the following is not a use of Epsom salt?A. As a purgativeB. As a mordant in dyeingC. As a stimulant to increase the secretion of bileD. For removal of sulphur from petroleum |
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Answer» Correct Answer - D Epsom salt is not used for removal of sulphur from petroleum. |
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| 31. |
What is X in the equation?A. `CaCO_3`B. CaC2C. `CO_2`D. none of these |
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Answer» Correct Answer - B `CaO+3Coverset(3273K)toCaC_2+CO` |
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| 32. |
The reaction of slaked lime with `Cl_2` gas givesA. only `Ca(Ocl)_2`B. only `CaCl_2`C. A mixture of `Ca(Ocl)_2." "Ca(OH)_2," "CaCl_2" and "H_2O`D. Quick lime or (e) Baryta water. |
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Answer» Correct Answer - C `Ca(OH)_2" and "Cl_2` react to give a mixture of `Ca(Ocl)_2,CaCl_2,Ca(OH)_2" and "H_2O`. This mixture is known as bleaching powder which is also represented as `CaOCl_2`. |
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| 33. |
Gypsum on heating to `390 K` givesA. `CaSO_4.2H_2O`B. `CaSO_4`C. `CaSO_4.1/2H_2O`D. `SO_3 " and "CaO` |
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Answer» Correct Answer - B Gypsum on heating to `300^(@)`C gives anhydration `underset("Gypsum")CaSO_4.2H_2Ooverset(200^(@)C)toCaSO_4+2H_2Ouparrow` |
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| 34. |
The function of sand in mortar is :A. to decrease the hardnessB. to prevent excessive shrinkage because of which cracks may resultC. to increase hardnessD. to make the mass compact |
| Answer» Correct Answer - B | |
| 35. |
Mortar ios a mixture of slaked lime and sand in the ratioA. 0.12569444444444B. 0.04375C. 0.085416666666667D. 0.044444444444444 |
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Answer» Correct Answer - B 1:3 ratio |
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| 36. |
India has no deposits of sulphur. However, large deposits of gypsum occur in india. How can you obtain `SO_2` from gypsum quantitative?A. by heating anhydrous gypsum to `1200^(@)`C aloneB. by heating anhydrous gypsum with coke to `1200^(@)`CC. by treating gypsum with conc. `HNO_3` at `700^(@)`CD. none of these |
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Answer» Anhydrous gypsum `(CaSO_4)` when heated `1200^(@)`C decomposes slightly. `2CaSO_4overset(1200^(@)C)iff2CaO+2SO_2+O_2` However, to get quantitative yield of `SO_2` anhydrous gypsum is heated with coke, when calcium sulphide is first formed. `CaSO_4+2CtoCaS+2CO_2uparrow` On heating further to `1200^(@)`,calcium sulphide reacts with `CaSO_4` to give `SO_2` `CaS+3CaSO_4iff2CaO+4SO_2uparrow` |
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| 37. |
Formula of gypsum salt isA. `CaSO_4`B. `CaSO_(4).0.5H_2O`C. `CaSO_4.H_2O`D. `CaSO_4.2H_2O` |
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Answer» Correct Answer - D Chemical formula of gypsum is `CaSO_4.2H_2O`. |
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| 38. |
Gypsum is not chemically similar toA. SeleniteB. alabasterC. anhydriteD. fluorspar |
| Answer» Gypsum `CaSO_4.2H_2O)` is chemically similar to selenite, alabaster and anhydrite. Fluorspar is `CaF_2`. | |
| 39. |
The function of sand in mortar is :A. to decrease the hardnessB. to make the mass compactC. to decrease the plasticity of the massD. to present cracks when the mortar sets to a solid mass |
| Answer» Sand in mortar prevents the formation of cracks. | |
| 40. |
Magnesium is an important component of which biomolecule occuring extensively in living world?A. HaemoglobinB. ChlorophyllC. FlorigenD. ATP. |
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Answer» Correct Answer - B Chlorophyll, the green colouring matter of plants, is a complex compound of magnesium. |
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| 41. |
Assertion (A): Addtion of `NH_(4)OH` to an aqueous solution of `BaCl_(2)` in the presence of excess of `NH_(4)Cl` precipitates `Ba(OH)_(2)`. Reason (R ): `Ba(OH)_(2)` is insoluble in water.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 or (E) Both A and R are false. |
| Answer» Correct Answer - C | |
| 42. |
A solution of calcium in liquid ammonia on evaporation producesA. `Ca(NH_3)_4`B. `Ca(NH_3)_6`C. `[Ca(NH_4)_6]`D. `Ca(NH_2)_2` |
| Answer» A solution of calcium in liquid `NH_3` on evaporating produces `Ca(NH_3)_6` as residue. | |
| 43. |
`MgCl_2.NH_4Cl.6H_2O` on heating in air gives as residueA. Mg(OH)ClB. `MgCl_2`C. `Mg(OH)_2`D. MgO |
| Answer» `MgCl_2.NH_4Cl.6H_2O` on heating first loses `H_2O` (without any hydrolysis) and then `NH_4Cl` sublimes off leaving behind pure `MgCl_2`. | |
| 44. |
Calcium bicarbonate isA. a white crystalline solidB. a white powderC. a colourless crystalline solidD. none of these |
| Answer» Calcium bicarbonate does not exist in solid state. | |
| 45. |
Magnesium is used as a reducing agent for the production ofA. MnB. TiC. ZrD. Hf |
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Answer» Correct Answer - B,C,D Magnesium is used as a reducing agent in the production of Ti, Zr and Hf. |
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| 46. |
Which of the following is a true peroxide?A. `NO_2`B. `MnO_2`C. `BaO_2`D. `SO_2` |
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Answer» Correct Answer - C `BaO_2` or barium peroxide is a true peroxide. |
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| 47. |
Which of the following alkaline earth metals is the strongest reducing agent?A. CaB. SrC. BaD. Mg. |
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Answer» Correct Answer - C `Ba(E^(@)=-2.92)` is the strongest reducing agent. |
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| 48. |
The plaster of paris is hardened byA. liberating `CO_2`B. changing into `CaCO_3`C. uniting with CaOD. uniting with water |
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Answer» Correct Answer - D Uniting with water (factual) |
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| 49. |
Group 2 elements areA. oxidising agentsB. reducing agentsC. oxidising as well as reducing agentsD. none of these |
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Answer» Correct Answer - B These have lower ionisation energy so lose electron and act as reducing agent. |
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| 50. |
Which of the following statements is correct?A. Alkali metals are less electropositive than alkaline earth metalsB. The alkaline earth metals are denser and harder than alkali metalsC. The alkali metals are denser and harder than alkaline earth metalsD. The first ionziation potential of alkali metals is more than that of alkaline earth metals |
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Answer» Correct Answer - B Because these have small size and are closely packed in the crystal lattice. |
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