1
BITSAT 2021
MCQ (Single Correct Answer)
+3
-1

The approximate time duration in hours to electroplate 30 g of calcium from molten calcium chloride using a current of 5 A is (Atomic mass of Ca = 40)

A
80
B
10
C
16
D
8
2
BITSAT 2021
MCQ (Single Correct Answer)
+3
-1

Given, the reduction potential of Na+, Mg2+, Al3+ and Ag+ as $$E_{N{a^ + }/Na}^o$$ = $$-$$ 2.17 V; $$E_{M{g^{2 + }}/Mg}^o$$ = $$-$$ 2.37 V; $$E_{A{g^ + }/Ag}^o$$ = $$-$$ 0.08 V.

The least stable oxide is

A
Ag2O
B
Al2O3
C
MgO
D
Na2O
3
BITSAT 2020
MCQ (Single Correct Answer)
+3
-1

A solution of copper sulphate is electrolyzed between copper electrodes by a current of 10.0A passing for one hour. Which of the following statements is correct regarding the changes occur at the electrodes and in the solution?

A
11.84 g of copper will deposit on the cathode
B
11.84 g of copper will deposit on the anode
C
11.84 g of copper will deposit on the anode as well as on the cathode
D
copper will not deposit on any of the electrode
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