UNN Chemistry 2006/2007 Day 1 Past Questions

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

If 67.5g of oxide of lead was reduced to 61.2g of metal, calculate the formula of the oxide (Pb = 207, O = 16)

Calculate the minimum volume of the oxygen that is required for complete combustion of a mixture of 20cm³ of CO and 10cm³ of hydrogen

HNO₃ + H₂O → H₃O⁺ + NO_{3In the reaction above NO3 is the}

The pH range of a neutralization product of the CH₃COOH and KOH is

How much NaOH is required to make 250cm³ of 0.1mol/dm³ solution?

2PbO₂ --> 2PbO + O₂
In the equation above, the oxidizing agent is

A current of 0.5A flows for 1930 seconds and deposits 0.325g of metal M. If the charge is +2, the relative molecular mass is

Emission of chlorofluorocarbon (CFC) into the atmosphere causes

The diagram above shows the reaction path of an exothermic reaction. The heat of reaction is represented by

Which of the following samples will react fastest with dilute HCl?

The colour exhibited by copper in a flame test is

Which of the following statements is correct?

The IUPAC name for
is

3-methylbutan-2-one is an isomer of