UNN Chemistry 2005/2006 DAY 1 Past Questions

Which of the following is a mixture?

Two elements, X and Y, have atomic numbers 8 and 13 respectively. The formula for the possible compound formed between X and Y is

3g of a mixture of CaO and CaCO₃, was heated to a constant mass. If 0.44g of CO₂ was liberated, calculate the percentage of CaO in the mixture

An alkanoic acid has a molecular mass of 88. Its molecular formula is

If the rate of diffusion of oxygen is taken as 1cm³/s, what will be the rate of diffusion of methane whose relative molecular mass is 16?

An increase in temperature causes an increase in the pressure of a gas in a fixed volume due to an increase in the

In electrolysis, the chemical reaction which takes place at the anode is

In the electrolysis of brine, it is essential to prevent the mixing of the products because

In what way is equilibrium constant for the forward reaction related to that of the reverse reaction?

When chlorine water is exposed to sunlight, the gas evolved is

PbCl₂ does not dissolve in liquid ammonia while AgCl does. This is because

When sodium hydroxide pellets are exposed to the atmosphere, the first gas they absorb is

What is the IUPAC name of the hydrocarbon?
$\table;CH_3,-,C,=,CH,-,CH_3;,,∣, , ∣, , , ;,,CH_2, ,CH_3,;,,∣, , , , , ;,,CH_3,,,;$

Which of the following is NOT a monomer?

Which of the following behaves like ethyne?