UNN Chemistry 2014/2015 Day 3 Past Questions

Practice each question, then open it to see the full details.

Hydration of ions in solution is associated with

A.absorption of heat
B.reduction of heat
C.conduction of heat
D.liberation of heat

A current was passed for 10mins 20secs and 0.1mole of Cu was deposited. How many grams of silver will be deposited by the same quantity of electricity? (Ag = 108)

A.10.8 g
B.21.6 g
C.5.4 g
D.108 g

What is the pH of 0.001moldm^-3 of H₂SO₄?

A.3
B.2.7
C.2
D.4

If a reaction is exothermic and there is great disorder, it means

A.the reaction is in a state of equilibrium
B.there will be a large decrease in free energy
C.there will be a large increase in free energy
D.the reaction is static

The gasification of coke is used for the manufacture

A.natural gas
B.producer gas
C.synthetic gas
D.industrial gas

Which of the following is arranged in order of increasing atomic radius?

A.Cl, P, Al, Mg, Na, Si
B.Na, Mg, Al, Si, P, Cl
C.Cl, P, Si, Al, Mg, Na
D.Na, Al, Si, Mg, P, Cl

Calculate the molecular formula of a hydrocarbon with molar mass 26 and 92.3% of Carbon.

A.C₂H₂
B.C₃H₃
C.C₂H₆
D.C₂H₄

Which of these can be used in removing oil stains?

A.Benzene
B.Chlorine water
C.Washing soda/soda ash
D.potassium trioxonitrate V

The position of equilibrium in a reversible reaction is affected by

A.surface area of the reactants exposed
B.presence of catalyst
C.changes in size of reaction flask
D.changes in concentration of the reaction

Which of the following solutions containing only hydroxyl ions will liberate hydrogen gas when reacted with magnesium metal?

A.1.0 x 10^-12 moldm^-3
B.1.0 x 10^-6 moldm^-3
C.1.0 x 10^-4 moldm^-3
D.1.0 x 10^-2 moldm^-3