Chemistry

An organic compound commonly used as a disinfectant is
Toluene
Glycol
Styrene
Phenol
Which of the following is the least soluble in water?
Al(OH)3
Ca(OH)2
NaOH
KOH
The factor that lowers the activation energy of a chemical reaction is
Pressure
Temperature
Catalyst
Concentration
Incomplete oxidation of ethanol yields
CH3COOH
CH3COCH3
CH3CH2OCH2CH3
CH3CHO
The oxidation number of Iodine in KIO3 is
+7
+3
+5
+6
The acid anhydride that will produce weak acid in water is
SO3
NO2
SO2
CO2
If Y = 1S22S22P4 and X = 1S22S22P63S2, the chemical formula of the likely compound formed between X and Y is
X2Y
XY2
XY
X2Y3
The constituent of air necessary in the rusting process are
O2 and H2O
Ar and CO2
CO2 and H2O
O2 and CO2
The pollutant that may induce the condensation of water vapour in the atmosphere is
Oxides of Nitrogen
Soot
Dust
Chlorofluorocarbon
10cm3 of hydrogen was sparked with 10cm3 of oxygen at s.t.p. Calculate the volume of the unreacted gas
15cm3
20cm3
5cm3
10cm3
2.5g of potassium trioxonitrate (V) saturates 20g of water at 250C. Calculate its solubility in grammes per 100g
50.0g
25.0g
5.5g
12.5g
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=96500 Cmol-1]
0.300g
0.250g
0.224g
0.448g
Ca(OH)2(aq) + 2NH4Cl(s) → CaCl2(s) + 2H2O(l) + X. In the above reaction, X is
NO2
NH3
N2O
N2
Temporary hardness of water is formed when rain water containing dissolved carbon (IV) oxide flows over deposits of
CaCO3
Na2CO3
Na2SO4
CaSO4
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
Calculate the amount in moles of a gas which occupies 10.5 dm3 at 6atm and 300C [R=082 atm dm-3 K-1 mol-1]
2.536
1.623
4.736
0.394
Ethene is prepared industrially by
Reforming
Polymerization
Distillation
cracking
Butter is an example of emulsion in which
Solid is dispersed in a liquid medium
Gas is dispersed in a solid medium
Liquid is dispersed in a solid medium
Liquid is dispersed in a gas medium
Sodium hydroxide can be used
In the purification of bauxite
As a deoxidant in steel casting
In the extraction of Sulphur
In the extraction of iron
A mixture of sulphur and sugar can best be separated by dissolution in water followed by
Filtration and evaporation
Decantation and filtration
Centrifugation and evaporation
Decantation and evaporation
Due to the high reactivity of sodium, it is usually stored under
Water
Mercury
Paraffin
Phenol
C2H5 – C = CH2
CH3 The IUPAC nomenclature of the structure is
3-methylbut-3-ene
2-methylbut-1-ene
2-ethylprop-1-ene
2-methylbut-2-ene
Calculate the amount in moles of silver deposited when 9650C of electricity is passed through a solution of silver salt.
0.05
10.80
10.00
0.10
In which of the following reactions will an increase in pressure shift the equilibrium position to the left?
2H2(g) ⇄ H2(g) + I2(g)
2SO2(g) +O2(g) ⇄ 2SO3(g)
N2O4(g) ⇄ 2NO2(g)
3H2(g) + N2(g) ⇄ 2NH3(g)
The product of the decay of Phosphorus – 32 as a β-emitter is
2411Na
2713Al
3216S
3517Cl
In the laboratory preparation of ethyl ethanoate, the water present in the mixture is removed using a solution of
Anhydrous CaCl2
Concentrated Na2CO3
Dilute NaOH
Concentrated H2SO4
The ability of an atom in a molecule to attract shared electrons to itself is
Electron affinity
Ionic radius
Ionization energy
Electronegativity
The reaction of Halogens with alkanes in the presence of sunlight is an example of
Oxidation reaction
Addition reaction
Hydrogenation reaction
Substitution reaction
The principle of coumn chromatography is based on the ability of the constituents to
React with the solvent in the column
React with each other in the column
Dissolve in each other in the column
Move at different speeds in the column
The ability of carbon to form long chains is referred to as
Alkylation
Acylation
Carbonation
Catenation
Ammonium chloride can be separated from its mixture with common salt by
Distillation
Evaporation
Decantation
Sublimation
Cast iron is used in making
Chains and agricultural implements
Iron sheets and retort stand
Nails and iron rods
Stoves and cookers
The colour of litmus in an alkaline medium is
Red
Yellow
Pink
Blue
The industrial preparation of Hydrogen gas from water gas is referred to as
Bosch process
Bayer process
Haber process
Contact process
The relative atomic mass of a naturally occurring Lithium consisting of 90% 73Li and 10% 63Li is
6.2
6.8
7.1
6.9
Which of the following statements is true about 2-methylpropane and butane?
They have different number of carbon atoms
They are members of the same homologous series
They have the same boiling points
They have the same chemical properties.
N2O4(aq) ⇄ 2NO2(g) ∆H= +ve.
In the reaction above, an increase in temperature will
Increase the reactant production
Increase the value of the equilibrium constant
Shift the equilibrium to the left
Decrease the value of the equilibrium constant
The process that requires the use of hard water in its operation is
Tanning
Bottling
Laundry
Dyeing
What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na= 23, O=16, H=1]
0.05moldm-3
0.03moldm-3
0.50moldm-3
0.40moldm-3
The pollutant that contributes to the depletion of the ozone layer is
CFCs
NO2
SO2
CO
Which of the following properties is not peculiar to matter?
Kinetic energy of particles increases from solid to gas
Random motion of particles increases from gas to solid
Orderliness of particles increases from gas to liquid
Random motion of particles increases from liquid to gas
What volume of 0.5M H2SO4 will exactly neutralize 20cm3 of 0.1M NaOH solution?
2.0cm3
5.0cm3
6.8cm3
8.3cm3
Ethanol is soluble in water due to the presence of a
Carbonyl group
Hydroxyl group
Phenyl group
Methyl group
Diamond cannot be used
In making bicycle chains
As abrasives
In cutting glass and metals
As dies for cutting wires
An example of an acidic oxide is
NO
CO
SO2
CuO

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