Q: Which method of purification is represented by the following equation?\$Ti(s)+2I_{2}(g)\xrightarrow{523K}TiI_{4}(g)\xrightarrow{1700K}Ti(s)+2I_{2}(g)\$

\$Ti(s)+2I_{2}(g)\xrightarrow{523K}TiI_{4}(g)\$\$TiI_{4}(g)\xrightarrow{1700K}Ti(s)+2I_{2}(g)\$This process is also known as Van Arkel method. It is used for refining Zirconium or Titanium. In this method, oxygen and nitrogen present as impurity are removed by heating metal in an evacuated vessel with iodine.Hence, option D is correct.

Q: Number of electrons involved in the electrodeposition of \$63.5\ g\$ of \$Cu\$ from a solution of \$CuSO_{4}\$ is?

\$\begin{array}{l} 63.5gm\, of\, Cu=1mol\, of\, Cu. \\ No.\, of\, equivalent=No.\, of\, moles\times valency\, factor \\ =1\times 2=2 \\ 1\, mole\, of\, electron\, \, will\, deposite\, 1\, equivalent. \\ Number\, of\, electron=2\times 6.022\times { 10^{ 23 } } \\ =12.044\times { 10^{ 23 } }. \\ Hence,\, option\, C\, is\, the\, correct\, answer. \end{array}\$

Q: Which of the following pair of metals is purified by van-Arkel method?

\$Zr\$ and \$Ti\$ is purified by the Van-Arkel method. This method is used to remove the oxygen and nitrogen completely present in the impure form of metals.

Question 1

You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.

Accepted Answer

Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate. The citric acid present in the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer. That is why, tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its characteristic lustre.

Question 2

Explain Mond's process used for refining of nickel.

Accepted Answer

Mond process for refining of Nickel is based on the principle that nickel is heated in the presence of carbon monoxide to form nickel tetracarbonyl, which is a volatile copound.$Ni + 4 CO \xrightarrow{330-350 \; K} \underset{\left( \text{Nickel tetracarbonyl} \right)}{Ni{\left( CO \right)}_{4}}$Now, the obtained nickel tetracarbonyl is decomposed by subjecting it to a higher temperature $\left( 450 - 470 \; K \right)$ to obtain pure nickel metal.$\underset{\left( \text{Nickel tetracarbonyl} \right)}{Ni{\left( CO \right)}_{4}} \xrightarrow{450 - 470 \; K} \underset{\left( \text{Pure nickel} \right)}{Ni} + 4 CO$

Question 3

Liquation method is used for the purification of which of the following metals?

Accepted Answer

Liquation is used for the refining of metals having low melting point and are associated with high melting impurities. For example, $Pb,\ Sn,\ Sb,\ Bi$ and $Hg$. The impure metal is heated on the sloping hearth of a furnace. The pure metal flows down leaving behind the non-fusible material on the hearth.

Question 4

Which method of purification is represented by the following equation?$Ti(s)+2I_{2}(g)\xrightarrow{523K}TiI_{4}(g)\xrightarrow{1700K}Ti(s)+2I_{2}(g)$

Accepted Answer

$Ti(s)+2I_{2}(g)\xrightarrow{523K}TiI_{4}(g)$$TiI_{4}(g)\xrightarrow{1700K}Ti(s)+2I_{2}(g)$This process is also known as Van Arkel method. It is used for refining Zirconium or Titanium. In this method, oxygen and nitrogen present as impurity are removed by heating metal in an evacuated vessel with iodine.Hence, option D is correct.

Question 5

During the process of electrolyte refining of copper, some metals present as impurity settle as 'anode mud'. These are:

Accepted Answer

In Electrolytic refining, the impure metal is made to act as an anode. A strip of the same metal in pure form is used as a cathode. They are put in a suitable electrolytic bath containing a soluble salt of the same metal. The more basic metal remains in the solution and the less basic ones go to the anode mud.Copper is refined using an electrolytic method.Impurities from the blister copper deposit as anode mud which contains antimony, selenium, tellurium, silver, gold, and platinum; recovery of these elements may meet the cost of refining.

Question 6

Zone refining process is used for the:

Accepted Answer

Zone Refining (Fractional Crystallisation): This method is employed to get metal of very high purity i,e. ultra pure samples of Ge Si, B, Ga, In. This method is based on the fact that impurities are more soluble than the pure metal in the melt.

Question 7

Van Arkel method of purification of metals involves converting the metal to a:

Accepted Answer

Van Arkel method of purification of metals involves converting the metal to a volatile stable compound.For example,  $\displaystyle Ni$ is heated with $\displaystyle CO$ to form  volatile $\displaystyle Ni(CO)_4$$\displaystyle Ni+4CO \xrightarrow {330-350 \: K} Ni(CO)_4$.Option B is correct.

Question 8

Number of electrons involved in the electrodeposition of $63.5\ g$ of $Cu$ from a solution of $CuSO_{4}$ is?

Accepted Answer

$\begin{array}{l} 63.5gm\, of\, Cu=1mol\, of\, Cu. \ No.\, of\, equivalent=No.\, of\, moles\times valency\, factor \ =1\times 2=2 \ 1\, mole\, of\, electron\, \, will\, deposite\, 1\, equivalent. \ Number\, of\, electron=2\times 6.022\times { 10^{ 23 } } \ =12.044\times { 10^{ 23 } }. \ Hence,\, option\, C\, is\, the\, correct\, answer. \end{array}$

Question 9

Which of the following pair of metals is purified by van-Arkel method?

Accepted Answer

$Zr$ and $Ti$ is purified by the Van-Arkel method. This method is used to remove the oxygen and nitrogen completely present in the impure form of metals.

Question 10

The method of zone refining of metals is based on the principle of:

Accepted Answer

This method is based on the principle that the impurities are more soluble in the melt than in the solid state of the metal. A circular mobile heater is fixed at one end of a rod of the impure metal. The molten zone moves along with the heater which is moved forward. As the heater moves forward, the pure metal crystallises out of the melt and the impurities pass on into the adjacent molten zone.Option D is correct.

Revise with Concepts

Methods of Refining of Metals

Quick Summary With Stories

Electrorefining of Metals

You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.

Explain Mond's process used for refining of nickel.

Liquation method is used for the purification of which of the following metals?

Which method of purification is represented by the following equation?

$T i (s) + 2 I_{2} (g) 523 K T i I_{4} (g) 1700 K T i (s) + 2 I_{2} (g)$

During the process of electrolyte refining of copper, some metals present as impurity settle as 'anode mud'. These are:

Zone refining process is used for the:

Van Arkel method of purification of metals involves converting the metal to a:

Number of electrons involved in the electrodeposition of $63.5 g$ of $C u$ from a solution of $C u S O_{4}$ is?

Which of the following pair of metals is purified by van-Arkel method?

The method of zone refining of metals is based on the principle of:

Revise with Concepts

Methods of Refining of Metals

Quick Summary With Stories

Electrorefining of Metals

You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.

Explain Mond's process used for refining of nickel.

Liquation method is used for the purification of which of the following metals?

Which method of purification is represented by the following equation? Ti(s)+2I2​(g)523K​TiI4​(g)1700K​Ti(s)+2I2​(g)

During the process of electrolyte refining of copper, some metals present as impurity settle as 'anode mud'. These are:

Zone refining process is used for the:

Van Arkel method of purification of metals involves converting the metal to a:

Number of electrons involved in the electrodeposition of 63.5 g of Cu from a solution of CuSO4​ is?

Which of the following pair of metals is purified by van-Arkel method?

The method of zone refining of metals is based on the principle of:

Which method of purification is represented by the following equation?

$T i (s) + 2 I_{2} (g) 523 K T i I_{4} (g) 1700 K T i (s) + 2 I_{2} (g)$

Number of electrons involved in the electrodeposition of $63.5 g$ of $C u$ from a solution of $C u S O_{4}$ is?