Standard electrode potential for Sn⁴⁺/Sn²⁺ couple is +0.15 V and that for the Cr³⁺/Cr couple is -0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will […]
Which of the following will not displace hydrogen
Options
(a) Hg (b) Pb (c) Ba (d) Sn
Correct Answer:
Hg
Explanation:
Mercury lies below hydrogen in the electrochemical series so it will not […]
The standard emf of galvanic cell involving 3 moles of electrons in its redox reaction is 0.59 V. The equilibrium constant for the reaction of the cell is
Options
(a) 10²⁵ (b) 10²° […]
In electrolysis of NaCl when Pt electrode is taken then H₂ is liberated at cathode while with Hg cathode it forms sodium amalgam
Options
(a) Hg is more inert than Pt (b) More […]
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
Options
(a) increase in ionic mobility of ions (b) 100% ionisation of electrolyte at normal dilution (c) increase […]
How many coulombs are required for the oxidation of 1 mole H₂O to O₂
Options
(a) 3.86 x 10⁵ C (b) 1.93 x 10⁵ C (c) 4.825 x 10⁴ C (d) 9.65 x […]
Molar conductivity decreases with decrease in concentration
Options
(a) for strong electrolytes (b) for weak electrolytes (c) both for strong and weak electrolytes (d) for non-electrolytes
Correct Answer:
for non-electrolytes
Explanation:
No explanation […]
After tow hours, the ratioactive substance becomes 1/16th of original amount. Then the half -life (in min) is
Options
(a) 60 min (b) 120 min (c) 30 min (d) 15 min
Correct Answer: […]
The amount of electricity requried to deposit 0.9 g of aluminium, when the electrode reaction is Al³⁺ + 3e⁻ → Al
Options
(a) 9.65 ˣ 10⁴ C (b) 1.93 ˣ 10⁴ C (c) […]
Standard reduction potential for Al³⁺ / Al , Fe²⁺ / Fe, Br/Br are ₋1.66 V, ₋0.45 V, 1.09 V. Order of their reducing capacity is
Options
(a) Al>Fe>Br (b) Br>Fe>Al (c) Al>Br>Fe (d) […]
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