2024 Chemistry

  1. At a given temperature and pressure, a gas X diffuses twice as fast as gas Y. It follows that
  • A. Gas Y is two times as heavy as Gas X
  • B. Gas Y is four times as heavy as Gas X
  • C. Gas Y is monoatomic
  • D. Gas X is diatomic
  1. The number of molecules of helium gas contained in 11.5g of the gas is
  • A. 1.73 x 1023
  • B. 1.73 x 1022
  • C. 1.73 x 1024
  • D. 1.73 x 1021
  1. The constituents of Alnico are Aluminium, Nickel and 
  • A. Mg
  • B. Co
  • C. Mn
  • D. Cu
  1. Silver and Gold are metals found as free uncombined elements in the earth’s crust, which makes them to be referred to as
  • A. corrosive metals
  • B. reactive metals
  • C. natural metals
  • D. noble metals
  1. In the extraction of Aluminium, the silica impurity is removed by 
  • A. electrolysis
  • B. filtration
  • C. reaction with H2SO4
  • D. precipitation
  1. When Calcium ethynide is decomposed by water, the gas produced is 
  • A. CO
  • B. H2
  • C. C2H2
  • D. CH4
  1. The constituent of petroleum fraction used in surfacing road is
  • A. petrol
  • B. diesel
  • C. lubricating oil
  • D. bitumen
  1. During the fractional distillation of crude oil, the fraction that distills at 200 – 25000 C is
  • A. bitumen
  • B. diesel
  • C. kerosene
  • D. petrol
  1. A liquid hydrocarbon obtained from fractional distillation of coal tar that is used in the pharmaceutical industry is
  • A. xylene
  • B. benzene
  • C. hexane
  • D. Toluene
  1. An organic compound contains 53.1% Carbon, 6.2% Hydrogen, 12.4% Nitrogen, and 28.3% Oxygen by mass. What is the molecular formula of the compound if its vapour density is 56.5?   [ C =12, H = 1, N = 14, O = 16]. 
  • A. C5H7NO2
  • B. C5H6NO2
  • C. C3H6NO2
  • D. C3H7NO2
  1. The empirical formula of an organic liquid hydrocarbon is XY. If the relative molar masses of X and Y are 72 and 6 respectively, it’s vapour density is likely to be
  • A. 33
  • B. 66
  • C. 39
  • D. 78
  1. Biuret test is a chemical test used for detecting the presence of 
  • A. carbohydrates
  • B. proteins
  • C. amines
  • D. alkanoates
  1. A gas when mixed with oxygen, it produces a very hot and early controllable flame. What is the name of the flame and where is it used?
  • A. Acetylene flame; miners’ lamb
  • B. Oxy-ethylene ; hunters’ torch
  • C. Oxy-ethylene flame; miners’ lamb
  • D. Oxy-ethylene flame ; cutting and welding metals
  1. The number of geometrical isomers of butene are 
  • A. 2
  • B. 3
  • C. 5
  • D. 4
  1. How many isomers has the organic compound represented by the formula C3H8O ?
  • A. 2
  • B. 3
  • C. 4
  • D. 5
  1. When a few drops of Millon reagents is added to egg-white solution in a test tube, the white precipitate changes to
  • A. orange
  • B. brick red
  • C. reddish brown
  • D. blue
  1. If the solubility of KNO3at 300C is 3.10 mol/dm3a solution containing 303g/dm3 KNO3 is likely to be
  • A. saturated
  • B. unsaturated
  • C. supersaturated
  • D. at saturation point
  1. 127g of sodium chloride was dissolved in 1.0dm3of distilled water at 2500C . Determine the solubility in moldm−3of sodium chloride at that temperature. [Na = 23, Cl = 35.5] 
  • A. 1.0
  • B. 2.0
  • C. 2.2
  • D. 4.1
  1. The quantity of electricity required to deposit 180g of Ag from a molten silver trioxonitrate(V) is

[Ag = 108]

  • A. 1.08F
  • B. 3.30F
  • C. 1.67F
  • D. 1.80F
  1. What would be the order of the electrolytic cell in an industry intending the production of silver plated spoons?
  • A. Cathode is the spoon; anode is a silver rod; electrolyte is a soluble silver salt
  • B. Cathode is a silver rod; anode is the spoon; electrolyte is a soluble silver salt
  • C. Cathode is the spoon; anode is any rod; electrolyte is a soluble silver salt
  • D. Cathode is any rod; anode is the spoon; electrolyte is a soluble salt

21.

The table above shows the formulae of some ions. In which of these compounds is the formula not correct?

  • A. Aluminiumtetraoxosulphate(VI), Al2(SO4)3
  • B. Calciumtrioxonitrate(V), Ca(NO3)2
  • C. Iron(III)bromide, Fe3Br
  • D. Potassiumsulphide, K2S
  1. The pH of a 0.001 mol dm−3of  H2SO4is 

[Log102 = 0.3]

  • A. 2.7
  • B. 3.0
  • C. 3.3
  • D. 2.0
  1. Strong acids can be distinguished from weak acids by any of the following methods, EXCEPT
  • A. Conductivity measurement
  • B. The use of litmus paper
  • C. Measurement of pH
  • D. Measurement of heat of reaction
  1. The chemical formula for potassiumhexacyanoferrate(II) is
  • A. [Fe(CN)6]4−
  • B. K3Fe(CN)6
  • C. Fe(CN)6
  • D. K4Fe(CN)6
  1. For chemical reaction to be spontaneous, ∆G must be
  • A. positive
  • B. negative
  • C. zero
  • D. equal to the enthalpy change

 

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