Three faradays electricity was passed through an aqueous solution of iron(II) bromide.The weight of iron metal(at. wt = 65) deposited at the cathode (in gm) is

Solution

The volume of oxygen gas liberated at NTP by passing a current of 9650 coulombs through acidified water is :

1.12 litre
2.24 litre
11.2 litre
22.4 litre

Solution

When an acid cell is charged, then :

voltage of cell increases
electrolyte of cell dilutes
resistance of cell increases
none of the above

Solution

Charging increases the voltage. When the discharged cell is recharged, it acts as electrolytic cell.

In the electrolysis of water, one faraday of electrical energy would liberate

one mole of oxygen
one gram atom of oxygen
8g oxygen
22.4 lit.of oxygen

Solution

According to the definition 1 F or 96500 C is the charge carried by 1 mol of electrons when water is electrolysed
2H₂O ⟶ 4H⁺ + O₂ + 4e^-
So, 4 Faraday of electricity liberate = 32 g of O₂.
Thus 1 Faraday of electricity liberate= \(\frac{32}{4}\) g of O₂ = 8 g of O₂

To deposit one equivalent weight of silver at cathode, the charge required will be

9.65 × 10⁴ C
9.65 × 10³ C
9.65 × 10⁵ C
9.65 × 10⁷ C

Solution

How many atoms of calcium will be deposited from a solution of CaCl₂ by a current of 25 mA flowing for 60 seconds?

4.68 × 10¹⁸
4.68 × 10¹⁵
4.68 × 10¹²
4.68 × 10⁹

Solution

On passing current through two cells, connected in series containing solution of AgNO₃ and CuSO₄, 0.18 g of Ag is deposited. The amount of the Cu deposited is:

0.529 g
10.623g
0.0529 g
1.2708 g

Solution

Total charge on 1 mole of a monovalent metal ion is equal to

9.65 × 10⁴ coulombs
1.6 × 10^-19 coulombs
6.2 × 10¹⁸ coulombs
None of these

Solution

Total charge on one mole of monovalent metal ion = Charge on N₀ electrons
1F = 96500 coulombs = 9.65 × 10⁴ coulombs

A silver cup is plated with silver by passing 965 coulombs of electricity. The amount of Ag deposited is :

107.89 g
9.89 g
1.0002 g
1.08 g

Solution

Iron pipes, lying in acidic soil,are often attached to the blocks of magnesium for their protection from rusting,because magnesium

is lighter than iron
is readily converted into positive ion
forms a corrosion-resistant alloy with iron
prevents air from reaching the surface of iron

Solution

Magnesium which is more electropositive than iron prevents the rusting of iron by converting themselves into positive ion and thus reverses the process of conversion of iron to Fe³⁺ ion.

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