Electrochemistry

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Question

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Question 1 :

When a lead storage battery is discharged..

1. lead is formed
2. SO₂;is evolved
3. lead sulphate is consumed
4. sulphuric acid is consumed
Answer
5317

Question 2 :

What flows in the internal circuit of a galvanic cell?

1. Electricity
2. Electrons
3. Ions
4. Atoms
Answer
5318

Question 3 :

9.65 C of electric current is passed through fused anhydrous magnesium chloride. The magnesium metal thus, obtained is completely converted into a Grignard reagent. The number of moles of the Grignard reagent obtained is ______.

1. 5 * 10^-4
2. 1 * 10^-4
3. 5 * 10^-5
4. 1 * 10^-5
Answer
5319

Question 4 :

A solution containing one mole per litre of each Cu (NO₃ )₂, AgNO₃ ,Hg₂ (NO₃ )₂ and Mg(NO₃ )₂ is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts (reduction potential) are

Ag⁺ / Ag = + 0.80, Hg₂²⁺ / 2Hg = 0.79
Cu²⁺ / Cu = + 0.34, Mg²⁺ / Mg = -2.37

With increasing voltage, the sequence of deposition of metals on the cathode will be

1. Ag, Hg, Cu, Mg
2. Mg, Cu, Hg, Ag
3. Ag, Hg, Cu
4. Cu, Hg, Ag
Answer
5320

Question 5 :

When 9.65 coulombs of electricity is passed through a solution of silver nitrate (atomic weight of Ag = 107.87 taking as 108) the amount of silver deposited is ............ .

1. 10.8 mg
2. 5.4 mg
3. 16.2 mg
4. 21.2 mg
Answer
5321