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OAU Post UTME Past Questions (Free Version)

Organic Chemistry is the branch of Chemistry that deals with ------- and -------

Hydrogen & oxygen
Carbon & Carbon
Carbon & Sulphur

When a solution of silver (I) nitrate is saturated with hydrogen sulphide, a black precipitate forms which is

H2S
Ag2S
PbS
HNO3

The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as

Brownian motion
Zig Zag Motion
Evaporation
Liquefaction

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Which of the following is an acidic salt?

NaHSO4
Na2SO4
CH3CO2Na
Na2S

Given that the molecular mass of iron is 56 and that of oxygen is 16, how many moles of iron (III) oxide will be contained in 1kg of the compound?

5moles
625moles
25moles
25moles

3.0g of a mixture of potassium carbonate and potassium chloride were dissolved in a 250cm3 standard flask. 25cm3 of this solution required 40.00cm3 of 0.01M HCl for neutralization. What is the percentage by weight of k2CO3 in the mixture? (k = 39, O = 16, C = 12)

92
89
72
82

0.499g of CuSO4.XH2O when heated to constant weight gave a residue of 0.346g. What is the value

of X?

0
0
0
0

The principal constituents of natural gas is

Methane
Ethane
Propane
Butane

Which of the following gases can be collected by the method of downward delivery?

Chlorine
Oxygen
Ammonia
Hydrogen

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