20 questions
The standard reduction potential of metals A,B,C and D are -0.40v, +0.34v,+0.8v and -1.67v. The metal that can displace all others is
D
B
A
C
When tin is over iron, it acts as an oxidizing agent and protects iron.
TRUE
FALSE
The equilibrium constants of two redox reactions X and Y are 1.5 x1015 and 5.5 x 1016 . Reaction X is more spontaneous than Y.
FALSE
TRUE
Cu∣Cu2+∥Fe2+,Fe3+∣Pt In this cell
Copper ion is the oxidizing agent
Copper is the oxidizing agent
Fe3+ is the oxidizing agent
Fe2+ is the oxidizing agent
When KMnO4 acts as an oxidizing agent and ultimately forms MnO42–, MnO2, Mn2O3 and Mn2+, then the number of electrons transferred in each case is
3,4,1,5
1,3,4,5
5,4,3,1
4,5,31
Given: (i) Cu2+ + 2e- → Cu, Eo = 0.337 V
(ii) Cu2+ + e- → Cu+, Eo = 0.153 V
Electrode potential E° for the reaction Cu+ + e– → Cu will be
0.284v
0.530v
0.184v
0.380v
The standard reduction potential value of the three metallic cations X, Y and Z are 0.52, -3.03 and -1.18 V respectively. the order of reducing power of the corresponding metals is
Y>X>Z
X>Y>Z
X>Z>Y
Y>Z>X
Chlorine can not displace
F from NaF
I from NaI
Br from NaBr
F and I from salt solution
Which of the following will form the cathode with respect to iron anode in an electrolyte cell - ( Eo = - 0.40 v)
Mg ( - 2.37v)
Cd (- 0.44v)
Ni (- 0.22v)
Al (-1.67v)
Electrolytic conduction differs from metallic conduction in the fact in the case of electrolytic conduction
Resistance decreases with increase in temperature
It does not heat up the wire
Resistance increases with increase in temperature
Resistance is independent of temperature
Cell constant is generally found by measuring the conductivity of aqueous solution of
NaCl
KCl
BaCl2
KNO3
Connecting iron pipes to a magnesium block. This is called
A cell constructed by coupling copper and magnesium electrode has emf of 2.7 volts. if the standard reduction potential of copper electrode is +0.34 volts, that of magnesium electrode is
2.36v
-3.04v
+3.04
-2.36v
The electrolyte used in the salt bridge is
With increase in dilution the conductivity increases.
TRUE
FALSE
Faraday's law of electrolysis is related to
atomic mass
atomic number
equivalent mass
mobility of the anion and cation
It is impossible to measure the half cell potential because
the electron must be allowed to flow
of the resistance offered by the solution
ions are not free to move
there is no measuring device connected
The cell constant of a conductivity cell keeps changing with the electrolytes used.
TRUE
FALSE
Which of the following is not correct for the dry cell?
Zinc is the anode
It is a primary cell
The oxidation state of Mn reduced from +4 to +3
Ammonia gas is released
3 Faraday's of electricity is passed through Al2O3, CuSO4 and NaCl taken in three electrolytic cells. The amount of Al,Cu and Na deposited at the cathode will be in the ratio
1 mole : 2 mole :3 mole
3 mole : 1 mole : 2 mole
1.5 mole : 2 mole : 3 mole
1 mole : 1.5 mole : 3 mole