Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
Which of the following statement is true of the electrochemical series?
Electropositivity of metals increase down the series
Electropositivity of non-metals decrease down the series
Electronegativity of non-metals decrease down the series
Electropositivity of metals decreases down the series
Correct answer is D
No explanation has been provided for this answer.
the heat content of the reactants is lower than that of the products
the heat content of the reactants is higher than that of the products
the reaction is slow
a large amount of heat is absorbed
Correct answer is B
No explanation has been provided for this answer.
X/4 g
X/2 g
2X g
4X g
Correct answer is B
From M = zit
Where M = to the mass of the metal liberated
z = Is the electrochemical equivalent
∴ X g = 1 * 1 * 40 * 60
X g = 2400 I
Let Y represent the new mass
Y = 1*2I * 10 * 60
Y = 1200 I
Y/(X g) = 1200 I/2400 I
Y = X/2 g
0.0
1.0
2.0
3.09
Correct answer is D
No explanation has been provided for this answer.
24 125 coulombs
48 250 coulombs
72 375 coulombs
96 500 coulombs
Correct answer is B
4 Faradays of electricity is required to liberate one mole of oxygen gas
∴ quantity of electricity required
= 0.125 * 4 * 96500 = 48250 coulombs