Please, fill out the information below to continue. NAME EMAIL PHONE NUMBER 1. Helium is preferred to hydrogen in filling balloons because hydrogen?is a component of waterExhibits isotopyis diatomicis inflammable2. Dynamic equilibrium describes a situation where?Both forward and reverse reactions proceed at the same rateReactants are converted to productsReaction gives back the reactantA concentration of reactants and product is equal3. 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?- 0.42v- 1.1v+ 0.42v+ 1.1v4. Most commonly used Rodenticides are _______ in nature.Anti solventAnti CoagulantNon anti coagulantAnti pesticides5. Substance Q reacts with cold water to form a solution which turns red litmus blue?Substance Q could beCalciumNitrogenSulphurPhosphorus6. Natural rubber is a ________ which is having high elasticity.ElastomerChemical using carbon as main compoundMaterialSubstance7. If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged, is the one that hasLower electrical chargeGreater stability in solutionStronger tendency to accept electronsSmaller mass8. An exothermic reaction is one which involvesPositive change in value of enthalpyLoss of heat to the surroundingsEvolution of gas as it proceedsAttainment of dynamic equilibrium9. In which form is natural petroleum found?KeroseneCrude OilTarGasoline10. The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased byUsing zinc powder instead of granulesCooling the reaction mixtureUsing zinc rod instead of zinc granulesCarrying out the reaction at a higher pressure11. An element Y has the electronic configuration 1s2 2s2 2p6 3s2 3p4 How many shared pair of electrons are present in element Y?654712. What is detergent?A liquid soventA liquid solubleA liquid surfactantA liquid solution13. The Azimuthal quantum number which corresponds to the f-orbital is2061314. Fructose and glucose are isomers with a molecular formula C6H12O6. Which of these statements is true of both?glucose and fructose are non-reducing sugarsfructose has an alkanal group while glucose has an alkanone groupboth have an alkanal groupfructose gives a brick red ppt with Fehlings solution but glucose does notfructose has an alkanone group while glucose has an alkanal group15. 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 isvan der waalsionic bondcovalent bondhydrogen bondcoordinate covalent bond16. N2(g) + 3H2(g) ↔ 2NH3(g); ∆H = -90kj/molIn the equation above, the yield of ammonia can be decreased byIncreasing the pressureAdding a catalystIncreasing the temperatureRemoving the ammonia as it is formed17. Metallic elements that give coloured salts in aqueous solutions are called........... metalss-blockd-blockalkalif-blockalkaline-earth18. A measure of the degree of disorder in chemical system is known asEntropyEquilibriumFree energyEnthalpy19. In which of the following compounds does sulphur have an oxidation number of +4H2S207H2SO4SO3Na2SO3H2S20. Freshly boiled tap water tastes different from ordinary tap water becauseit contains more carbon(iv)oxidethe water molecules are now smallerall the germs have been killedit contains less dissolved airit contains more dissolved oxygen21. Trioxonitrate (v) acid is not used for preparing hydrogen gas from metals because itRenders the metal passiveis volatileis strongly oxidisingforms a layer of oxide on the metal22. 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}12.0g2.0g24.0g1.0g4.0g23. An atom is electrically neutral if the number ofNeutrons is equal to the atomic numberProtons is equal to the number of electronsElectrons is equal to the number of neutronsProtons is equal to the number of neutrons24. What is the composition of soap?Sodium salt with fatty acids.Sodium and Potassium salt mixed with chemicalsBoth a & bPotassium salt with fatty acids25. What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?[H=1, O=16]72.0g54.0g8.0g36.0g26. The following metals are usually extracted by the method of electrolysis EXCEPTsodiumironmagnesiumaluminiumpotassium27. When hydrogen sulphide gas is passed through an acidified solution of potassium heptaoxo dichromate(vi), the orange colour changes to green. This is because thechromium(vi) ion is oxidized+6 state of Cr is reduced to +3 statehydrogen sulphide is a good oxidizing agent+3 state of Cr is oxidized to +6 statesulphide ion changes to sulphur atom28. The Azimuthal quantum number which corresponds to the f-orbital is3206129. The catalyst generally used in the synthesis of methanol from carbon(ii)oxide and hydrogen iszinc oxidevanadium(v)oxideplatinumnickelcopper-zinc oxide30. Which of these elements will not displace hydrogen from dilute hydrochloric acid?CopperPotassiumMagnesiumZinc31. Which of the following does NOT have the electronic structure of Argon?sulphide ionpotassium ionaluminium ionchloride ioncalcium ion32. When ammonium chloride is dissolved in water in a test tube, the test tube feels cooler showing that?Sublimation has occurredThe solution is unsaturatedThe process is endothermicAmmonia gas is evolved33. The main constituents of petroleum arehydrocarbonsgasesalkynessolidsalkanes34. Which of the following is true of gamma (γ) rays? Theyare negatively chargedare neutraltravel at very low speedare positively chargedhave no ionizing power35. Which of the following is true of Ionisation energy?it is unaffected by nuclear chargeit increases down the groupit is the energy due to electron gainit increases across the periodthe higher the screening effect, the higher the ionization energy36. Where are Bio-chemical compounds used?Food preservativesAll of the aboveSkin TreatmentsCooking Oils37. Which of the following alloys contain Tin and Lead?coinage metalsteelbrasssolderbronze38. In galvanizing iron, the metal which coats the iron issilverzincaluminiumgoldtin39. The gas given off when calcium is added to water isNitrogen(iv)oxideHydrogenCalcium oxideOxygen40. Hydrogen can be found in these substances except?LimestoneAlkalisAcidsNatural Gas41. In which of the following compounds does sulphur have an oxidation number of +4H2SO4Na2SO3SO3H2SH2S20742. The following are diatomic except?HeliumNitrogenHyrdrogenFluorine43. Potassium Methanoate is a salt of a weak acid and a strong base. When it is added to water, itdissolves to give a neutral solutionneutralizes itselfhydrolyses to give a solution which turns blue litmus redhydrolyses to give a solution which turns red litmus bluedoes not dissolve44. Which of the following alloys contain Tin and Lead?brassbronzesoldersteelcoinage metal45. What volume of propane is left unreacted when 20cm³ of oxygen reacts with 20cm³ of propane?40cm³16cm³1cm³5cm³20cm³46. Factors affecting a system in chemical equilibrium include all these exceptConcentrationCatalystTemperaturePressure47. Allotropes of an element differ in their?Mass numberChemical PropertyPhysical PropertyElectronic Configuration48. A synthetic rubber is having__________weight.Higher molecularLower densityHigher atomicHigher resistance49. Chemical equilibrium is attained whenReactants in the system are used upConcentration of the reactants is greater than that of the productsConcentrations of the products and reactants remain constantConcentration of products is greater than that of the reactant50. N2O4(g) ↔ 2NO2(g)In the endothermic reaction above, more product formation will be favoured byIncrease in volumeAn increase in pressureDecreasing the temperatureA decrease in volume51. What would happen if more heat is applied to the following system at equilibrium?X2(g) + 3Y2(g) ↔ 2XY3(g); ∆H = -xKj/molThe yield of XY3 will increaseMore of XY3 will decomposeThe forward reaction will go to completionMore of X2 will react52. Chemistry is a branch of science which can be used for providing the services to mankind. Comment on the statement.TrueStrongly notFalseMay Be53. The condition for spontaneous reaction isΔH > 0ΔS < 0ΔG < 0ΔG = 0ΔG > 054. The electrolyte used in lead accumulator cell isAmmonium chloride solutionAmmonium chloride pasteManganese(iv)oxideTetraoxosulphate(vi) acid solution55. Which of the following substances decompose when an electric circuit is passed through it?tetra chloromethanedilute hydrochloric acidglucose solutionzinc rod56. Which of the following is NOT a halogen?fluorinebrominesiliconiodineastatine57. The green house effect is a climatic condition associated with the presence of excessCarbon (ii) oxideCarbon (iv) oxideHydrogen sulphideAmmonia58. The following salts can be prepared by a double decomposition reaction EXCEPTPbCl2BaSO4AgClKClBaCO359. 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 is12.0dm³5.0dm³7.5dm³10.0dm³30.0dm³60. Sulphur burns in air to form?Acidic oxideAmphoteric OxideBasic OxideNeutral oxide61 out of 60Time is Up!
