UNN Chemistry 2018/2019 - Model 1 Past Questions

Kerosene is commonly used to remove the red colour stain of palm oil from clothes because it

The most suitable metal that can be used as a lightning conductor is

Equal moles of ethyne and hyrogen iodide react to give

The air around smelting industries is likely to contain

The gas that is the most dangerous pollutant to humans is

The shape of the hydrocarbon compound CH₄ is

NH₄Cl(s) <==> NH₃(g) +HCl.
The reaction above can only attain equilibrium if

Water has the ability to dissolve almost all substances because its molecule has a structure with

The property used in the industrial preparation of nitrogen and oxygen from air is

H₂(g) + Br₂(g) 2HBr(g) The reaction above is carried out at 25°C. If ΔH is -72 kJ mol-¹ and ΔS is -106 J mol-¹K-¹, the reaction will

An emulsion may be produced by shaking a detergent solution with

Which of the following methods can be used to obtain pure water from a mixture of sand, water and methanoic acid?

An increase in entropy can best be illustrated by

0.05mol dm³ is neutralized by 25cm³ NaOH. If the volume of acid used is 32.00cm³, what is the concentration of the base?

Alkanals can be distinguished from alkanones by the reaction with