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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 1:

X + Y = Z is an equilibrium reaction. The addition of a catalyst?

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A Increase the amount of Z produced in a given time
B Increases the rate of change in concentrations of X, Y and Z
C Increases the rate of disapearance of X and Y
D Increases the rate of the forward reaction
E Decreases the amounts of X and Y left after the attainment of equilibrium

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Question 2:

X + Y = Z is an equilibrium reaction. The addition of a catalyst?

SchoolNGR Classroom

A Increase the amount of Z produced in a given time
B Increases the rate of change in concentrations of X, Y and Z
C Increases the rate of disapearance of X and Y
D Increases the rate of the forward reaction
E Decreases the amounts of X and Y left after the attainment of equilibrium

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Question 3:

What is the formula of sodium gallate if gallium (Ga)shows an oxidation number of + 3?

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A NaGaO₃
B Na₂Ga(OH)₃
C NaGa(OH)₃
D NaGa(OH)₄
E NaGaO

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Question 4:

If the ONLY pollutants found in the atmosphere over a city are oxides of nitrogen, suspended lead compounds. carbon monoxide and high levels of methane, the probable source(s) of the pollution must be?

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A Automobile exhaust and biological decomposition
B Combustion of coal and automobile exhaust
C Biological decomposition only
D Combustion of coal, automobile exhaust and biological decomposition
E Combustion of coal and biological decomposition

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Question 5:

A correct electrochemical series can be obtained from K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging?

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A Al and Mg
B Zn and Fe
C Zn and Pb
D Pb and H
E Au and Hg

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