UI Chemistry 2018/2019 Past Questions

Which of the following gases dissolves in water vapour to produce acid rain during rainfall?

Which of the following is not allotrope of carbon?

Which oxide is amphiprotic (amphoteric)?

Why will it always be more difficult to extract potassium ions from sea water than to extract magnesium ions? This is because

............ can be used to test for reducing sugars:

The oxidizing agent in the reaction, 3Br₂ + 6OH = BrO₃ + 5Br + 3H₂O is ...........

When heat is absorbed during a chemical reaction, the reaction is said to be

Given the reaction at equilibrium: 2CO(g) + O₂(g) 2CO₂(g) When the reaction is subjected to stress, a change will occur in the concentration of

Given the reaction at equilibrium: N₂(g) + O2(g) 2NO(g) as the concentration of N₂(g) increases, the concentration of O₂(g) will

If a reaction is exothermic and there is a great disorder, it means that

200 cm³ of air was passed over heated copper in a syringe several times to produce copper (II) oxide. When cooled, the final volume of air recorded was 158 cm³. Estimate the percentage of oxygen in the air.

30cm³ of oxygen at 10 atmosphere pressures is placed in a 200dm³ container. Calculate the new pressure if temperature is kept constant.

Bond dissociation energy of 500 KJ mol^-1 may be assigned to

A mixture of iron and sulphur can be separated by dissolving the mixture in ..........

A mixture of sand, ammonium chloride and sodium chloride is best separated by ..........

The symbol of an isotope is $^{57}_{26}Fe$ Which gives the correct numbers of protons, neutrons and electrons in this atom?

An atom can turn into an ion if it

A substance has an ionic structure. It conducts electricity when molten but not when solid. The substance could be?

Which of the following substances consists of small molecules?

Which of the following is true as a liquid changes to a gas in evaporation?

A weak Acid is one which is

A positive brown ring test indicates the presence of

Which of the following molecules is not linear in shape?

A solution that contains as much as solute as it can dissolve at a given temperature is said to be

The correctly balanced equation for FeS₂+O₂→Fe₂O₃+SO₂