Electrochemical Principles

Q.

What is electrolysis of water?

Q. Match items of column I with the items of column II and assign the correct code :

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \left(a\right)& \text{Cyanide process}& \left(i\right)& \text{Ultrapure Ge}\\ \left(b\right)& \text{Froth floatation process}& \left(ii\right)& \text{Dressing of ZnS}\\ \left(c\right)& \text{Electrolytic reduction}& \left(iii\right)& \text{Extraction of Al}\\ \left(d\right)& \text{Zone refining}& \left(iv\right)& \text{Extraction of Au}\\ & & \left(v\right)& \text{Purification of Ni}\end{array}$

1. $\begin{array}{cccc}\left(a\right)& \left(b\right)& \left(c\right)& \left(d\right)\\ \left(iv\right)& \left(ii\right)& \left(iii\right)& \left(i\right)\end{array}$
2. $\begin{array}{cccc}\left(a\right)& \left(b\right)& \left(c\right)& \left(d\right)\\ \left(ii\right)& \left(iii\right)& \left(i\right)& \left(v\right)\end{array}$
3. $\begin{array}{cccc}\left(a\right)& \left(b\right)& \left(c\right)& \left(d\right)\\ \left(iii\right)& \left(iv\right)& \left(v\right)& \left(i\right)\end{array}$
4. $\begin{array}{cccc}\left(a\right)& \left(b\right)& \left(c\right)& \left(d\right)\\ \left(i\right)& \left(ii\right)& \left(iii\right)& \left(iv\right)\end{array}$

Q. Which of the following processes is used in extractive metallurgy of Magnesium?

1. Fused salt electrolysis

2. Self-reduction

3. Aqueous solution electrolysis

4. Thermite reduction

Q.

Predict the products of electrolysis in each of the following:
An aqueous solution of $AgN{O}_3$ with silver electrodes

Predict the products of electrolysis in each of the following:
An aqueous solution $AgN{O}_3$ with platinum electrodes

Predict the products of electrolysis in each of the following;
A dilute solution of $H_{2}S{O}_4$ with platinum electrodes.

Predict the products of electrolysis in each of the following:
An aqeuous solution of $CuC{l}_2$ with platinum electrodes.

Q. What is anode mud?

Q. Which of the following is not a mineral of Magnesium?

1. Magnesite
2. Magnetite
3. Olivine
4. Carnallite

Q. In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are

1. $HN{O}_3$ and $CO$ respectively
2. $O_2$ and $Zn$ dust respectively
3. $O_2$ and $CO$ respectively
4. $HN{O}_3$ and $Zn$ dust respectively

Q. Match items of Column $I$ with the items of Column $II$ and assign the correct code:

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \left(A\right)& \text{Cyanide process}& \left(I\right)& \text{Ultrapure}Ge\\ \left(B\right)& \text{Froth Floatation Process}& \left(II\right)& \text{Dressing of}ZnS\\ \left(C\right)& \text{Electrolytic reduction}& \left(III\right)& \text{Extraction of}Al\\ \left(D\right)& \text{Zone refining}& \left(IV\right)& \text{Extraction of}Au\\ & & \left(V\right)& \text{Purification of}Ni\end{array}$

1. $A\left(III\right)B\left(IV\right)C\left(V\right)D\left(I\right)$
2. $A\left(IV\right)B\left(II\right)C\left(III\right)D\left(I\right)$
3. $A\left(I\right)B\left(II\right)C\left(III\right)D\left(IV\right)$
4. $A\left(II\right)B\left(III\right)C\left(I\right)D\left(V\right)$

Q.

Correct the given incorrect statement “ On heating white powder of copper sulphate changes into blue crystal”.

Q. Sodium metal is extracted by the electrolysis of a)Nacl(liq) b)Nacl(aq) c)Na2So4(aq) d)NaNO3(aq

Q.

Compare the properties of a typical metal and a non-metal based on the following:

Oxidizing or reducing action

Q. In the electrolysis of $M^{n+}\left(aq\right)$, metal ions are discharged at negative electrode (cathode) and deposited there, above method of extraction is not possible for:

1. Sodium
2. Aluminium
3. Silver
4. Copper

Q. Electrolysis of concentrated aqueous $NaCl$ is carried out using $Pt$ electrodes. As the electrolysis progresses:

1. $pH$ decreases
2. $pH$ increases
3. $pH$ first decreases and then increases
4. $pH$ remains constant

Q. What is anode mud?

Q. Aqueous solution of nickel sulphate contains $N{i}^{2+}$ and ${S{O}_4}^{2-}$ ions. Which ion moves towards the cathode?

1. $N{i}^{2+}$
2. ${S{O}_4}^{2-}$
3. both A and B
4. none of these

Q. Which of the following processes is used in extractive metallurgy of Magnesium?

1. Fused salt electrolysis

2. Self-reduction

3. Aqueous solution electrolysis

4. Thermite reduction

Q. Highly electropositive metals cannot be extracted by carbon reduction process because, these:

1. metals combine with carbon to form carbides
2. metals do not react with carbon
3. metal oxides are not reduced by carbon
4. loss of metal is more in vaporisation

Q. Auto reduction process is used for the extraction of:

1. Pb
2. Cu
3. Hg
4. Al

Q. In the electrolysis of $M^{n+}\left(aq\right)$, metal ions are discharged at negative electrode (cathode) and deposited there, above method of extraction is not possible for:

1. Sodium
2. Aluminium
3. Silver
4. Copper

Q. The metal oxide reacts with a _______. The oxide is ________to metal and reducing agent is ______. Net Gibb's energy changes is ______.

1. oxidising agent, reduced, oxidised, positive
2. reducing agent, reduced, oxidised, positive
3. reducing agent, oxidised, reduced, negative
4. reducing agent, reduced, oxidised, negative

Q. Which of the following process is used in the extractive metallurgy of magnesium ?

1. self-reduction
2. aqueous solution electrolysis
3. fused salt electrolysis
4. thermite reduction

Q. When $Fe$ replaces $CuS{O}_4$ in the following reaction, what will be the ionic compound that forms between Fe and $CuS{O}_4$?

1. $Fe(S{O}_4{)}_2$
2. $FeS{O}_4$
3. $F{e}_2(S{O}_4{)}_2$
4. $F{e}_{2}S{O}_4$

Q. What nucleophile is needed to prepare to nitrile by way of an $S_{N}2$ reaction?

1. ${RO}^{-}$
2. $RC=C^{-}$
3. ${CN}^{-}$
4. ${RS}^{-}$

Q.

Consider following sets. Blue colour solution changes to colourless (or fades) in:

1. I, II, III
2. I, II
3. II, III
4. I, III

Q. $N{H}_{4}N{O}_2\to N_2+2H_{2}O$

1. $H_{2}O$
2. None of these
3. $N_2$
4. $N{H}_4^{+}$

Q. Which of the following processes is used in extractive metallurgy of Magnesium?

1. Fused salt electrolysis

2. Self-reduction

3. Thermite reduction

4. Aqueous solution electrolysis

Q.

An electrolytic cell is set up using two platinum electrodes and an aqueous solution of copper (II) sulphate. Name the spectator ion in the solution.

Q. A metal 'X' is prepared by the electrolysis of fused chloride. It reacts with hydrogen to form a colourless solid, from which hydrogen gas is released on treatment with water. The metal 'X' is :

1. Al
2. Ca
3. Cu
4. Zn

Q. what is redaoax reaction?

Q. $F{e}^{2+}$ does not give prussian blue colour with $K_4\left[Fe\right(CN{)}_6]$, but on its reaction with (X) prussian blue colour appears with the reagent. (X) is :

1. $H_{2}S{O}_4$
2. $Mn{O}_4^{-}/H^{+}$
3. $N{H}_3$
4. all of above