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What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?
[ F = 96 5000 C mol^-1 ]

A. 24 125 coulombs
B. 48 250 coulombs
C. 72 375 coulombs
D. 96 500 coulombs

View Answer & Discuss (24) JAMB 1999

X + Y → Z. The rate equation for the chemical reaction above is \(\frac{-Δx}{Δt}\) = K[X]\(^2\)[Y].
The overall order of the reaction is?

A. 0.0
B. 1.0
C. 2.0
D. 3.09

View Answer & Discuss (19) JAMB 1999

When a current I was passed through an electrolyte solution for 40 minutes, a mass X g of a univalent metal was deposited at the cathode. What mass of the metal will be deposited when a current 2I is passed through the solution for 10 minutes?

A. X/4 g
B. X/2 g
C. 2X g
D. 4X g

View Answer & Discuss (5) JAMB 1999

RS_(aq) + HF_(aq) → RF_(s) + HS_(aq)
ΔH = -65.7 kj mol^(-1).
From the equation above, it can be deduced that

A. the heat content of the reactants is lower than that of the products
B. the heat content of the reactants is higher than that of the products
C. the reaction is slow
D. a large amount of heat is absorbed

View Answer & Discuss (6) JAMB 1999

Which of the following statement is true of the electrochemical series?

A. Electropositivity of metals increase down the series
B. Electropositivity of non-metals decrease down the series
C. Electronegativity of non-metals decrease down the series
D. Electropositivity of metals decreases down the series

View Answer & Discuss (11) JAMB 1999

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