CBT Chemistry JAMB 2017 by Abbey /49 94 Created on February 19, 2020 By bolaChemistry CBT Chemistry JAMB 2017 1 / 49 Category: Chemistry 1 The general formula of alkanones is RCHO R 2 CO RCOOH RCOOR 2 / 49 Category: Chemistry 2 The constituent common to duralumin and alnico is Co Mn Al Mg 3 / 49 Category: Chemistry 3 The shape of the S-orbital is elliptical spiral circular spherical 4 / 49 Category: Chemistry 4 Aluminium hydroxide is used in the dyeing industry as a dye dispersant salt mordant 5 / 49 Category: Physics 5 The tincture of iodine means iodine dissolved in ethanol bromine chloride chlorine water water 6 / 49 Category: Chemistry 6 Temporary hard water is formed when rain water containing dissolved carbon(IV) oxide flows over deposits of Ca CO3 Na2 CO3 Na2 SO4 Ca SO4 7 / 49 Category: Uncategorized 7 The acid anhydride that will produce weak acid in water is SO 3 NO 2 SO 2 CO 2 8 / 49 Category: Chemistry 8 The process that occurs when two equivalent forms of a compound are in equilibrium is Isotopy Resonance Isomerism Reforming 9 / 49 Category: Chemistry 9 In the laboratory preparation of ethyl ethanoate, the water present in the mixture is removed using a solution of an hydrous Ca Cl4 concentrated Na CO4 dilute NaOH concentrated H4 SO4 10 / 49 Category: Chemistry 10 The constituent of air necessary in the rusting process are O2 and H2O Ar and CO2 CO2 and H2O O2 and CO2 11 / 49 Category: Chemistry 11 For a general equation of the nature xP + yQ → mR + nS, the expression for the equilibrium constant is k [P]^x [Q]^y [P]^x [Q]^y / [R]^m [S]^n [R]^m [S]^n / [P]^x [Q]^y m[R]n [S] / x[P]y [Q] 12 / 49 Category: Chemistry 12 A given mass of gas occupies 2dm 3 at 300k. At what temperature will its volume be doubled, keeping the pressure constant? 400k 480k 550k 600k 13 / 49 Category: Chemistry 13 The oxidation number of iodine in KIO 3 is +7 +3 +5 +6 14 / 49 Category: Chemistry 14 An isomer of C5 H12 is 2–ethyl butane butane 2–methyl butane 2–methyl propane 15 / 49 Category: Chemistry 15 When few drops of concentrated trioxonitrate(V) acid is added to an unknown sample and wanned an intense yellow colouration is observed. The likely functional group present in the sample is NH3 —C—C=O CHO CO CNH2 16 / 49 Category: Chemistry 16 A sample of orange juice is found to have a PH of 3.80. What is the concentration of the hydroxide ion in the juice? 1.6 10^-4 6.3 10^-11 6.3 10^-4 1.6 10^-11 17 / 49 Category: Chemistry 17 Incomplete oxidation of ethanol yields CH3 COOH CH3 COCH3 CH3 CH2 OCH2 CH3 CH2 CHO 18 / 49 Category: Chemistry 18 The salt formed from a weak acid and a strong base hydrolyzes in water to form A saturated solution an acidic solution a buffer solution an alkaline solution 19 / 49 Category: Chemistry 19 The ideal gas laws and equations are true for all gases at low pressures and lower temperatures low temperatures and high pressures high pressures and high temperatures low pressure and high temperatures 20 / 49 Category: Chemistry 20 When ΔH is negative, a reaction is said to be endothermic exothermic reversible ionic 21 / 49 Category: Chemistry 21. The answer is: 226 220 227 222 22 / 49 Category: Chemistry 22 The shape of ammonia molecules is trigonal planar octahedral square planar tetrahedral 23 / 49 Category: Chemistry 23 The mass of silver deposited when a current of 10A is passed through a solution of silver salt for 4830s is – (Ag = 108 F = 96500(mol^-1 ) 54.0g 27.0g 13.5g 108.0g 24 / 49 Category: Chemistry 24 Tin is unaffected by air at ordinary temperature due to its Low melting point Weak electropositive character High boiling point White lustrous appearance 25 / 49 Category: Chemistry 25 Calculate the amount in moles of silver deposited when 9650C of electricity is passed through a solution of silver salt [= 96500 Cmol^-1 ] 0.05 10.80 10.00 0.10 26 / 49 Category: Chemistry 26 The reaction of halogens in the presence of sunlight is an example of oxidation reaction addition reaction hydrogenation reaction substitution reaction 27 / 49 Category: Chemistry 27 The enzyme used in the hydrolysis of starch to dextrin and maltose is amylase diastatse invertase zymase 28 / 49 Category: Chemistry 28 The alkyl group is represented by the general formula C n H 2 n C n H 2 n − 2 C n H 2 n + 1 C n H 2 n + 2 29 / 49 Category: Chemistry 29. CH 2 S (g) + O 2(g) → 2Cn + SO 2(g) What is the change in the oxidation number of copper in the reaction? 0 to + 2 0 to + 1 C + 1 to 0 + 2 to + 1 30 / 49 Category: Chemistry 30. In the diagram above. X is SO 3 SO 2 S H 2 S 31 / 49 Category: Chemistry 31. The diagram above. Y is fused CaO H 2 O NaOH Concentrated H 2 SO 4 32 / 49 Category: Chemistry 32 Calculate the mass of copper deposited when a current of 0.5 ampere was passed through a solution of copper(II) chloride for 45 minutes in an electrolytic cell. [Cu = 64, F = 96500Cmol^-1 ] 0.300g 0.250g 0.2242g 0.448g 33 / 49 Category: Chemistry 33. C 3 H 5 – COH 3 =CH 2 The IUPAC nomenclature of the structure above is 3-methybut-3-ene 2-methylbut-1-ene 2-ethylprop-1-ene 2-methylbut-2-ene 34 / 49 Category: Chemistry 34 The reddish–brown rust on ion roofing sheets consists of Fe^3 + (H 2 O) 6 FeO.H 2 O Fe2 O3.3H 2 O Fe 3 O 4 .2H2 2 O 35 / 49 Category: Chemistry 35 The densities of two gases, X and Y are 0.5gdm -3 and 2.0gdm -3 respectively. What is the rate of diffusion of X relative to Y? 0.1 0.5 2.0 4.0 36 / 49 Category: Chemistry 36 The carbon atoms on ethane are sp^2 hybridized sp^3 hybridized sp^4 hybridized sp hybridized 37 / 49 Category: Chemistry 37 According to Charle’s law, the volume of a gas becomes zero at −100degrees C −273degrees C −373degrees C 0degrees C 38 / 49 Category: Chemistry 38 An oxide XO 2 has a vapour density of 32. What is the atomic mass of X? 20 32 14 12 39 / 49 Category: Chemistry 39 The gas that can be collected by downward displacement of air is chlorine sulphur (IV) oxide carbon (IV) oxide ammonia 40 / 49 Category: Chemistry 40 In the laboratory preparation of trioxonitrate (V) acid the nitrogen(iv) oxide formed as a by-product is removed by further heating adding concentrated H 2 SO 4 cooling the acid solution with cold water bubbling air through the acid solution 41 / 49 Category: Chemistry 41 A particle that contains a protons, 10 neutrons and 10 electrons is positive ion neutral atom of a metal neutral atom of a non-metal negative ion 42 / 49 Category: Chemistry 42 Ethene is prepared industrially by Reforming Polymerization Distillation Cracking 43 / 49 Category: Chemistry 43 Calculate the amount in moles of a gas which occupies 10.5 dm^3 at 6 atm and 30 degrees C [R = 082 atm dm^3 K^-1 mol^-1 ] 2.536 1.623 4.736 0.394 44 / 49 Category: Chemistry 44 If 100cm^3 of oxygen pass through a porous plug is 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is? [O = 16, H = 1] 10.0s 12.5s 17.7s 32.0s 45 / 49 Category: Chemistry 45 Due to the high reactivity of sodium, it is usually stored under water mercury paraffin phenol 46 / 49 Category: Chemistry 46 The furring of kettles is caused by the presence in water of calcium hydrogentrioxocarbonate (IV) calcium trioxocarbonate (IV) calcium tetraoxosulphate (VI) calcium hydroxide 47 / 49 Category: Chemistry 47 Water for town supply is chlorinate to make it free from bad colour bacteria temporary hardness permanent hardness 48 / 49 Category: Chemistry 48 Ca(OH) 2(s) + 2NH 4 Cl (g) → CaCl 2(s) + 2H 2 O 2(l) + X. In the reaction above X is NO2 NH3 N2O NO2 49 / 49 Category: Chemistry 49 X (g) + 3Y (g) —- 2z (g) H = +ve. if the reaction above takes place at room temperature, the G will be negative zero positive indeterminate Your score isThe average score is 22% LinkedIn Facebook VKontakte 0% Restart quiz No related posts. Share FacebookTwitterPinterestLinkedinWhatsappTelegramEmail
