UNIPORT Chemistry 2008/2009 Past Questions

Practice each question, then open it to see the full details.

What weight of sodium hydroxide is required to make 500cm³ of 0,2M solution?(Na = 23, O = 16, H = 1)

A.40g
B.20g
C.0g
D.4g
E.2g

60cm³ of hydrogen are sparked with 20cm³ of oxygen at 100°C and 1 atmosphere. The total volume of the residual gasses is

A.60cm³
B.10cm³
C.40cm³
D.30cm³
E.70cm³

0.16g of methane when burnt raise the temperature of 100g of water by 400c. what is the heat of combustion of methane if the heat capacity of water is 42J/g/°c, (CH₄ = 16)

A.1.160kJ/mol
B.1.180kJ/mol
C.1.560kJ/mol
D.1.600kJ/mol
E.1.680kJ/mol

Hydrated salt of formula MSO₄.XH₂O contains 45.3% by mass of water of crystallization. Calculate the value of X[M = 56, S = 32, O = 16, H = 1]

A.3
B.5
C.7
D.10

A given quantity of a gas occupies a volume of 228cm³ at a pressure of 750mmHg. What will be its volume at atmospheric pressure?

A.220cm³
B.225cm³
C.230cm³
D.235cm³