Electrochemistr...

Only One Option Correct Type

This section contains multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q.

Cl₂ gas is passed into a solution containing KF, Kl and KBr, and CHCI₃ is added. There is a colour in CHCI₃ (lower) layer. It is due to 

Select the correct statement(s) about galvanic cell (Daniell cell) with E^° _cell​ = 1.10 V

Given, 

E° _Ag⁺/Ag = 0.80 V
E° _Mg²⁺/Mg = -2.37 V
E° _Cu²⁺/Cu = + 0.34V 
E° _Hg²⁺/Hg = 0.79V

Q.

Which of the following statement(s) is/are correct?

One mole of Ag₂CO₃ is strongly heated in an open vessel. Residue wll be 

Zinc ,silver and iron plates are dipped in CuSO₄ solutions placed in different vessels as shown:

Blue colour of CuSO₄ fades in  

For the following half -cell reactions ,E° values are:

Mn²⁺(aq) + 2H₂O(l)  MnO₂(s) + 4H⁺(aq) + 2e^-, E⁰ = -1.23V

MnO^-₄ (aq) + 4H+(aq) +3e^-  MnO₂(s) + 2H₂O(l), E⁰ = +1.70 V

 Thus  

Which of the following statement is correct?

 
Then

Consider some facts about Standard Hydrogen Electrode(SHE).

I. It is assigned a zero potential at all temperature corresponding to the reaction.

II. Platinum electrode coated with platinum black is dipped in acidic solution and H₂ gas is bubbled through it.
III. Concentration of both are oxidised and reduced forms of hydrogen is maintained at unity.

 Select the correct facts

The gas X at 1 atm is bubbled through a solution containing a mixture of 1 M Y^- and 1 M Z^- at 298 K.If the standard reduction potential

then,

The standard reduction potential values of three metallic cations X, Y, Z are 0.52, -3.03 and -1.18 V respectively. The order of reducing power of the corresponding metals is

A solution containing one mole per litre each of Cu(NO₃)₂ ,AgNO₃ ,Hg₂(NO₃)₂ and Mg(NO₃)₂ is being electrolysed using inert electrodes. The value of standard redution potentials are

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

The standard reduction potentials at 298K for the following half-cell are given

Which is the strongest reducing agent?

The E^o _{M³⁺/M²⁺} values for Cr, Mn, Fe and Co are - 0.41 V, +1,57 V, + 0.77 V and m /m 1.97 V respectively. For which one of these metals the change in oxidation state from +2 to +3 is easiest?

Given the standard electrode potentials  

I. K⁺/K = -2.93V,
II. Ag⁺/Ag = 0.80V,
III. Hg^2+/Hg = 0.79 V 
IV. Mg²⁺/Mg = -2.37V,
V. Cr³⁺/Cr = - 0.74 V

These metals are arranged in increasing reducing power as

Statement Type

Direction : This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Statement I : CuSO₄ can be stored in a vessel made of zinc.

Statement II :  w.r.t SHE   

Statement I​ : When AgNO₃ solution is stirred with a spoon made of copper,solution turns blue.

Statement II : In electrochemical series ,copper is above silver