BUK Chemistry 2012/2013 Past Questions

What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons

The presence of unpaired electrons in an atom of transition metal gives rise to

A mixture of calcium chloride and calcium trioxocarbonate(iv) in water can be separated by

Which of the following features of a human skeleton can be determined by carbon dating?

What is the oxidation number of Nitrogen in Al(NO₃)₂

Which of the following compounds exhibits both structural isomerism and cis-trans isomerism?

Which of the following compounds is readily soluble in water

The main type of reaction that occurs in the blast furnace during the extraction of iron is

The atomic number of chlorine is 17. What is the number of electrons in a chloride ion

Which of the following elements has ground state electronic configuration with incomplete penultimate shell?

If a metal R forms compound with the formula R(NO₃)₂, the formula of its tetraoxosulphate (vi) is

The gas given off when NH₄Cl is heated with an alkali is

Which of the following substances increases in mass when heated in air?

Calculate the mass of sodium hydroxide in 5.00dm³ of a 0.125mdm^-3 solution. [NaOH = 4 gmol^-1]

Which of the following compounds will leave a metal residue when heated

When concentrated sodium chloride is electrolysed using inert electrodes, the products are

When alkynes are hydrogenated completely, they produce compounds with the general molecular formula

The reaction between ethane and chlorine to form 1,2-dichloroethane is

One of the methods used for combating air pollution is

Which of the following processes take place during the production of margarine from vegetable oils?

One of the characteristics of transition metals is

The alloy used extensively in the building industry is

What quantity of electrons in moles of is needed to discharge two moles of aluminium from aluminium oxide (AlO₂O₃)

```Use the following information to answer questions 24 and 25. An element X forms two chlorides with the formulae XCl<sub>2</sub> and XCl<sub>3</sub>```
Where is X in the periodic table

```Use the following information to answer questions 24 to 25 An element X forms two chlorides with the formulae XCl<sub>2</sub> and XCl<sub>3</sub>```
What type of bonding exists between X and Chlorine in each of the chlorides