BUK Chemistry 2014/2015 Past Questions

The presence of an impurity in a substance will cause the melting point to

How many unpaired electrons are there in the p-orbital of the fluorine atom

10.0dm³ of water added to 2.0 mol dm^-3 of 2.5dm³ solution of HCl. What is the concentration of the final solution in mol dm^-3?

Which of the following substances is not a salt?

In an endothermic reaction, if there is a loss in entropy, the reaction will

Which of the following gases is employed as an anaesthesia?

2-methylbutan-2-ol is an example of a

The compound that will react with sodium hydroxide to form salt and water only is

The decarboxylation of ethanoic acid will produce carbon(iv)oxide and

An example of oxidation-reduction enzyme is

The saponification of alkanoate to produce soap and alkanols involves

An isotope has atomic number of 15 and a mass number of 31. The number of protons is contains is

The hardness of water is mainly due to the presence of

Which of these is used to hasten the ripening of fruits

The gasification of coke is used for the manufacture of

Polyvinyl chloride is used in the production of

The rate of reaction usually decreases with a decrease in the concentration of reactants because

Which of the following is a physical change?

Which of the following metals is purified commercially by electrolysis?

The gas that is most useful in protecting humans against solar radiation is

The type of iron that is best suited for welding is

Which of the following noble gases is commonly found in the atmosphere?

Which of the following is not an alkali?

Which of the following metals is the least reactive

Which of the following is an example of a chemical change