UNN Chemistry 2017/2018 DAY 1 Past Questions

Stainless steel is used for making

The product formed at the cathode during the electrolysis of sodium chloride solution with carbon electrodes is

The alkanol obtained from the production of soap is

Some metals are extracted form their ores after some preliminary treatments by electrolysis (L), some by thermal reaction (T) and some by a combination of both processes (TL). Which set-up in the following for the extraction of iron, copper and aluminium is correct?

Which of the following will liberate hydrogen from steam or dilute acid?

The colour of metyl orange in alkaline medium is

A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, find the molecular formula.

Which of these represents a redox reaction?

The acid that is used to remove rust is

A compound commonly used for the sterilization and preservation of specimens and food is

The relative mass of a naturally occuring lithium consisting of 90% ⁷₃Li and 10% ⁶₃Li is

Which of the allotropes of carbon is a constituent of a lead pencil?

Coffee stains can best be removed by

Iron can be prevented from corrosion by coating the surface with

Substances used as drying agents are usually