UNN Chemistry 2010/2011 DAY 2 Past Questions

The separation of oil and water with different boiling points can best be achieved by

Calculate the minimum volume of oxygen that is required for the complete combustion of a mixture of 20cm³ of CO and 25cm³ of hydrogen

An increase in temperature causes an increase in the pressure of a gas because there is an increase in the

A liquid begins to boil when

If the relative rate of diffusion of a gas is 0.25 and that of Cl₂ under the same conditions is 0.20, calculate the relative molecular mass of the gas.

The following molecules contain hydrogen bonding EXCEPT

If 20cm³ of distilled water is added to 80cm³ of 0.50cmol/dm³ HCl solution, the new concentration of the acid is

What is H₂O₂ acting as in the equation below?
H₂O₂ + 2H⁺ + 2Fe²⁺ ---> 2H₂O + 2Fe³⁺

A current was passed for 10mins 20secs and 0.1 mole of Cu was deposited. How many grains of silver will be deposited by the same quantity of electricity? [Ag = 108]

Which of the following statements is correct?

NO_(g) + CO_(g) ---> N_2(g) + CO_2(g) ∆H = -89.3 KJ
What conditions would favour maximum conversion of nitrogen(II)oxide and carbon(II)oxide in the reaction above?

Which of the alloys below does not contain copper?

2Al_(s) + 2NaOH_{(aq) + 6H2O(l) ---> 2NaAl(OH)3(aq) + 3H2(g)
From the equation, give the condition of reaction}

Ethanol reacts with aqueous soidum oxoiodate(I) to give a bright yellow solid with a characteristic smell. The product is

An alkanoic acid has a molar mass of 102g. Derive its molecular formular and hence name the acid