Zinc and carbon rods are used as anode and cathode respectively in a
Leclanche cell
lead accumulator
Daniel cell
voltaic cell
Correct answer is A
In a Leclanche cell, the anode and the cathode are a zinc rod and a carbon rod respectively. The electrolyte is an ammonium chloride solution or paste (wet or dry cell).
not proceed spontaneously at the given
proceed spontaneously at the given temperature
proceed in the reverse direction at the given temperature
proceed spontenously at lower temperature
Correct answer is B
Where ∆G = ∆H - T∆S
Given data; ∆G = ?
∆H = -72KJ/mol,
T→ (25+273)K = 298K
∆S = -106J/mol or -0.106KJ/mol/K
: ∆G = -72 -(298 * -0.106)
= -72 + 31.588
∆G = -40.412KJ/mol
One of the condition for spontaneity of a reaction as ∆G to be negative.
Trioxonitrate (V) acid is not used for preparing hydrogen gas from metals because it
is strongly oxidizing
is volatile
renders the metal passive
forms a layer of oxide on the metal
Correct answer is A
No explanation has been provided for this answer.
The ion that can be used as an oxidizing agent is
Au3+
Fe3+
ClO-
Ca2+
Correct answer is C
No explanation has been provided for this answer.
264 g
39 g
352 g
156 g
Correct answer is A
No explanation has been provided for this answer.