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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 26:

2SO_2(g) + O_2(g) â†” 2SO_3(g)
Î”H = -189 kJ mol^-1
The equilibrium constant for the reaction above is increased by

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A Increasing the temperature of the system
B Increase the pressure of the system
C The addition of a catalyst to the system
D Increasing the surface area of the vessel

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Question 27:

3Cu_(s) + 8HNO_3(aq) 3Cu(NO₃)_2(aq) + 4H₂O_(l) + 2NO_(g)
In the equation above, copper is

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A An electron acceptor
B A base
C An oxidizing agent
D A reducing agent

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Question 28:

When Î”H is negative, a reaction is said to be

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A Ionic
B Reversible
C Exothermic
D Endothermic

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Question 29:

As the concentration of an electrolyte reduces, the conductivity

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A Reduces to zero
B Decreases
C Increase
D Is unaffected

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Question 30:

In which of the following reactions has the oxidation number of nitrogen increased?

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A 2NO_(g) + Br_2(l) â†’ 2NOBr_(l)
B 2NO_(g) + O_2(g) → 2NO_2(g)
C FeSO_4(aq) + NO_(g) â†’ Fe(NO)SO_4(s)
D 2NO(g) + Cl_2(g) â†’ 2NOCl(l)

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