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The raw materials used for the smelting of iron ore in a furnace is?
On heating, which of the following compounds will decompose to the free metal, nitrogen (IV) oxide and oxygen?
The group IA metals are not found free in nature because they
Carbon exists naturally in the combined state as?
The efficiency of a solid catalyst to increase reaction rates depends on its?
Dynamic equilibrium describes a situation where
The ion that will give a white precipitate with aqueous NaOH and soluble in excess of the base is
Which of the following pairs of substance will react further with oxygen to form a higher oxide?
The characteristic colour of the flame shown when a copper sail moistened with concentrated hydrochloric acid on a platinum wire is put on bunsen burner is?
In the industrial production of H2 from natural gas the CO2 produced along with the H2 is removed by
The sulphide which is insoluble in dilute hydrochloric acid is
Which of the following typically represents a photochemical reaction?
The gas obtained as a product of anaerobic action on organic matter buried in the earth is
Nigerian crude oil is described as light crude because of its
An example of aliphatic unsaturated hydrocarbon is
Which of the following has an isomer?
CH3-CH2-C ≡ CH
The hybridization in the compound above is
One mole of a hydrocarbon contains 36g of carbon and its vapour density is 20. The structure of the hydrocarbon is
An emulsion may be produced by shaking a detergent solution with
The products of the combustion of candle wax are
When 50cm2 of a saturated solution of sugar of molar mass 342 g at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is
Which of the following results in the fall of acid rain?
Water has the ability to dissolve almost all substance because its molecules has a structure with
When a crystal was added to the clear solution of its salt, the crystal did not dissolve and the solution remained unchanged. This showed that the solution was
A particle that contains 11 protons, 12 neutrons and 10 electrons is probably a
A difference between chemical and physical change is that in a chemical change
The volume of 2.5 moles of oxygen at s.t.p is
[Molar volume of a gas at s.t.p = 22.4 dm3]
Nuclear fission involves the splitting of a heavy element into two nuclei of
What is the molar mass of a substance, if 0.4 mole of the substance has a mass of 25.0g?
The element with the electron configuration 1s22s22p3 is
A decrease in atomic size and an increase in nuclear charge across a period lead to
The order in which a mixture of sand, ammonium chloride and sodium chloride can be separated is
The idea of planetary electron was that of
If 30cm3 of gas at 50oC is warmed to 80o at a fixed pressure, the fractional increase in volume is
2C2H2(g) + 5O2(g) = 4CO2(g) + 2H2O(g)
In the reaction above, the mass of carbon(IV)oxide produced on burning 78 g of ethyne is
[C =12, O = 16, H = 1]
The ion that can be used as an oxidizing agent is
H2(g) + Br2(g) → 2HBr(g)
The above reaction is carried out at 25oC. ΔH is -72 kJ mol-1 and ΔS is – 106 J mol-1K-1, the reaction will
Zinc and carbon rods are used as anode and cathode respectively in a
The solution that will conduct the highest amount of electricity is
In which of the following is the oxidation number of sulphur equal to -2?
In the electrolysis of CuSO4(aq) using platinum electrodes, the reaction at the anode is
Na2CO3(g) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + CO2(g)
How many moles of sodium trioxocarbonate (IV) are there in a 25 cm3 solution which required 10cm3 of 0.05 mol dm-3 hydrochloric acid solution to neutralize it?
If the heat of combustion of hydrogen is -285.8kJ,
What is the heat of formation of water?
5SO2(g) + 2KMnO4(aq) + 2H2O(l) → K2SO4 + 2MnSO4(aq) + 2H2SO4(aq)
In the reaction above, the products give a
In the diagram above, gas X is
In the diagram above, mixture Y is
The oxidation of the compound above produces
2-methylbut-2-ene has the structure
Which of the following functional groups will give gas bubbles when treated with a saturated solution of sodium hydrogen trioxocarbonate (IV)?
Bronze is preferred to copper in the making of medals because it