Please, fill out the information below to continue. NAME EMAIL PHONE NUMBER 1. Most commonly used Rodenticides are _______ in nature.Anti solventAnti pesticidesNon anti coagulantAnti Coagulant2. When hydrogen sulphide gas is passed through an acidified solution of potassium heptaoxo dichromate(vi), the orange colour changes to green. This is because the+6 state of Cr is reduced to +3 statesulphide ion changes to sulphur atomchromium(vi) ion is oxidized+3 state of Cr is oxidized to +6 statehydrogen sulphide is a good oxidizing agent3. Trioxonitrate (v) acid is not used for preparing hydrogen gas from metals because itforms a layer of oxide on the metalis strongly oxidisingRenders the metal passiveis volatile4. Which of the following decreases when a given mass of gas is compressed to half its initial volume?Average intermolecular distanceNumber of molecules presentFrequency of collisionsAtomic radius of each particle5. CuSO4.5H2O can be obtained from an aqueous solution of copper(ii)tetraoxosulphate(vi) byPrecipitationEvaporation to drynessCrystallizationUsing chromatography6. Which of these elements will not displace hydrogen from dilute hydrochloric acid?MagnesiumPotassiumZincCopper7. Freshly boiled tap water tastes different from ordinary tap water becauseall the germs have been killedthe water molecules are now smallerit contains more dissolved oxygenit contains less dissolved airit contains more carbon(iv)oxide8. N2(g) + 3H2(g) ↔ 2NH3(g); ∆H = -90kj/molIn the equation above, the yield of ammonia can be decreased byIncreasing the pressureRemoving the ammonia as it is formedAdding a catalystIncreasing the temperature9. The bleaching of wood pulp for making paper by sulphur(iv)oxide is a process ofdesulphurisationrefiningvulcanizationreductionoxidation10. The following oxides reacts with both acids and bases to form salts excepttin (iv) oxidecarbon (iv) oxideLead (ii) oxideZinc oxide11. What current in amperes will deposit 2.7g of aluminium in 2 hours?[Al = 27, 1F = 96500C]3241682812. Hydrogen can be found in these substances except?AlkalisLimestoneAcidsNatural Gas13. Which of the following alloys contain Tin and Lead?steelcoinage metalbronzebrasssolder14. The following metals are usually extracted by the method of electrolysis EXCEPTmagnesiumironpotassiumsodiumaluminium15. Example(s) of colloids include:I. emulsionsII. solsIII. FogIV. smokeI, II and III OnlyIV OnlyI, II, III and IVIII and IV OnlyI and II Only16. The condition for spontaneous reaction isΔG < 0ΔH > 0ΔG > 0ΔS < 0ΔG = 017. Lemon is a source of ................acidethanoiccitriclacticaminoascorbic18. Which is not used as an alkali?Potassium hydroxideSodium hydroxideCarbon hydroxideNitrogen hydroxide19. A feasible cell was constructed by joining the two half cells below:Cu2+ (aq) + 2e- → Cu(s); Eꝋ = + 0.34vZn2+ (aq) + 2e- → Zn(s); Eꝋ = - 0.76vWhat is the standard e.m.f of the cell?- 1.1v- 0.42v+ 1.1v+ 0.42v20. Metallic elements that give coloured salts in aqueous solutions are called........... metalsalkaline-earthf-blockd-blockalkalis-block21. N2O4(g) ↔ 2NO2(g)In the endothermic reaction above, more product formation will be favoured byDecreasing the temperatureIncrease in volumeAn increase in pressureA decrease in volume22. Which of the following gives a yellow precipitate of a metallic derivative when reacted with ammoniacal silver trioxonitrate(v) at room temperature?propanebuteneethanolpropyneethanal23. An element Y has the electronic configuration 1s2 2s2 2p6 3s2 3p4 To what period does it belong in the periodic table?365424. Sulphur burns in air to form?Acidic oxideBasic OxideAmphoteric OxideNeutral oxide25. When excess ammonia is added to an aqueous copper(ii)tetraoxosulphate(vi), a deep blue solution of copper(ii)tetraamine is formed. The type of bond in copper(ii)tetraamine iscovalent bondvan der waalsionic bondhydrogen bondcoordinate covalent bond26. An exothermic reaction is one which involvesPositive change in value of enthalpyAttainment of dynamic equilibriumEvolution of gas as it proceedsLoss of heat to the surroundings27. H2(g) + I2(g) ↔ 2HI(g) In the reaction, increasing the pressure willincrease the concentration of HIhave no effect on the equilibrium positiondecrease the concentration of HIfavour the forward reactionfavour the backward reaction28. A synthetic rubber is having__________weight.Higher resistanceLower densityHigher molecularHigher atomic29. 15dm³ of a gas at s.t.p. in a tube was pressed by a piston whose pressure was increased to twice its original value at the same temperature. The volume of the gas in dm³ at this new pressure is12.0dm³7.5dm³30.0dm³10.0dm³5.0dm³30. What volume of propane is left unreacted when 20cm³ of oxygen reacts with 20cm³ of propane?20cm³16cm³1cm³5cm³40cm³31. If the density of Hg at 273k is 13.5g/cm³. The volume occupied by 30g of Hg will be ............cm³2.220.453.002.181.2232. Natural rubber is a ________ which is having high elasticity.ElastomerChemical using carbon as main compoundMaterialSubstance33. Which of the following is not a type of elements?MetalsGasesMetalloidsNon Metals34. Which of the following is NOT a halogen?iodinebrominesiliconastatinefluorine35. Consider the reaction represented by the equation:H2(g) + I2(g) ↔ 2HI(g) ΔH = -ve Which of the following statements about the equation is correct?the removal of HI(g) formed will favour the backward reactionthe addition of a catalyst will change the equilibrium positionincrease in temperature will favour the forward reactionincrease in pressure will favour the forward reactionpressure will have no effect on the production of HI(g)36. What property of hydrogen makes it suitable for filling balloons?Its low densityIts solubilityIts flammabilityIts tensile strength37. What is the pattern of the degree of electropositivity of elements in the periodic table?Decreases across a periodDecreases down a group and across periodRemains constant down a groupIncreases across a periodRemains constant across a period38. The following metals are usually extracted by the method of electrolysis EXCEPTpotassiumsodiummagnesiumironaluminium39. A finely divided form of a metal burns more readily in air than the rod form because the rod hasHigher molar massDifferent chemical propertiesProtective oxide coatingSmaller surface area40. Which of the following alloys contain Tin and Lead?soldercoinage metalsteelbronzebrass41. Which of the following does NOT have the electronic structure of Argon?aluminium ionchloride ionpotassium ioncalcium ionsulphide ion42. Chemistry is a branch of science which can be used for providing the services to mankind. Comment on the statement.FalseStrongly notMay BeTrue43. The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased byCooling the reaction mixtureUsing zinc powder instead of granulesUsing zinc rod instead of zinc granulesCarrying out the reaction at a higher pressure44. The green house effect is a climatic condition associated with the presence of excessCarbon (iv) oxideCarbon (ii) oxideHydrogen sulphideAmmonia45. From the equation:Mg(s) + HCl(aq) → MgCl2(aq) + H2(g)What mass of hydrogen would be produced if 12.0g of magnesium reacted completely with dilute hydrochloric acid.{H=1; Mg=24; Cl=35.5}4.0g24.0g12.0g2.0g1.0g46. 15dm³ of a gas at s.t.p. in a tube was pressed by a piston whose pressure was increased to twice its original value at the same temperature. The volume of the gas in dm³ at this new pressure is12.0dm³30.0dm³10.0dm³5.0dm³7.5dm³47. The kinetic theory of gases can be used to explain all the following EXCEPTDiffusion of gasesDalton's atomic theoryExpansion of gasesGraham's lawGay-Lussac's law48. What volume of distilled water would be added to 30cm³ of 18mol/dm³ HCl in order to dilute it 20 times? [ H=1, Cl=35.5, M.V=22400cm³]542cm³12cm³360cm³600cm³27cm³49. Allotropes of an element differ in their?Physical PropertyMass numberElectronic ConfigurationChemical Property50. Which of the following pairs of compounds will undergo addition reaction?ethane and ethyneethyne and ethylethanoatebutyne and etheneethanol and propanonebenzene and methane51. Dynamic equilibrium describes a situation where?Reaction gives back the reactantReactants are converted to productsBoth forward and reverse reactions proceed at the same rateA concentration of reactants and product is equal52. Radioisotopes can be used:I. As radioactive tracersII. for sterilizationIII. in photographyIV. for dyeingI, II, III and IVI and II OnlyIV OnlyIII and IV OnlyI, II and III Only53. Which of the listed molecules has two lone pairs of electrons?carbon(iv)oxidehydrogen gasbenzenewaterammonia54. Which of the following is not a separation technique?evaporationdistillationfiltrationhydrationcrystallization55. Dilute HCl produces a gas with each of the following compounds EXCEPTiron(ii)sulphidecopper(ii)trioxocarbonate(iv)sodium tetraoxosulphate(vi)calcium trioxocarbonate(iv)sodium trioxosulphate(iv)56. In galvanizing iron, the metal which coats the iron iszincsilveraluminiumgoldtin57. Water gas is a mixture of?Nitrogen and HydrogenCarbon(ii)oxide and hydrogenCarbon and HydrogenCarbon(iv)oxide and hydrogen58. Substance Q reacts with cold water to form a solution which turns red litmus blue.Substance Q could be?PhosphorusCalciumNitrogenSulphur59. The Azimuthal quantum number which corresponds to the f-orbital is6302160. The electrolyte used in lead accumulator cell isAmmonium chloride pasteManganese(iv)oxideAmmonium chloride solutionTetraoxosulphate(vi) acid solution61 out of 60Time is Up!
