General principles and processes of isolation of elements practice · Mixed difficulty

In the electrolytic purification of copper some gold is found in the:

For purification of alumina, the modern processes most useful when (i) the impurity present is a lot iron oxides and (ii) the impurity present is a lot of silica, are

The overall reaction for the electrolytic production of aluminium by means of the Hall Heroult process may be represented as
$\mathrm{Al_2O}_3(\mathrm{s})+3 \mathrm{C}(\mathrm{s}) \longrightarrow 2 \mathrm{Al}(\mathrm{s})+3 \mathrm{CO}(\mathrm{g})$
At $1000^{\circ} \mathrm{C}$, the standard free energy change for the process is $-594 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The minimum voltage required to produce one mole aluminium at this temperature is

A common metal used as reductant for the extraction of metals from their oxides is:

Ferric oxide in furnace is reduced by:

An ore of silver is:

Which metal adsorbs hydrogen?

The material used for the lining of Bessemer’s converter in the extraction of copper is:

Which method of purification is represented by the following equation:
$Ti\left( s \right) + 2{I_2}\left( g \right)Ti{I_4}\left( g \right)Ti\left( s \right) + 2{I_2}\left( g \right)$

The maximum temperature that can be achieved in blast furnace is:

The pyrolusite ore contains:

Which one of the following is the most correct statement?

The tempering of steel makes it:

Iron is obtained on large scale from haematite($\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3}$):

In electrolytic purification, which of the following is made of impure metal?

Consider the following statements-

(A) In theAluminothermite process, aluminium acts as reducing agent.

(B) The process of extraction of gold involves the formation of $\left[\mathrm{Au}(\mathrm{CN})_2\right]^{-}$and $\left[\mathrm{Zn}(\mathrm{CN})_4\right]^{2-}$.
(C) In the extractive metallurgy of zinc, partial fusion of $\mathrm{ZnO}$ with coke is called sintering and reduction of ore to the molten metal is called smelting.

(D) Extractive metallurgy of silver from its ore argentine involves complex formation and displacement by more electropositive metal.

Choose the correct options-

Carbon shows maximum capacity of catenation because:

The variety of iron having highest melting point is:

The flux used in soldering is:

Furnaces are lined with calcium oxide because:

After partial roasting, the sulphide of copper is reduced by:

Metal which can be extracted from all the three dolomite, magnesite and carnallite is

Assertion (A): In the extraction of ${Ag}$ by Cyanide process, Air must be blown in the disolution of ${Ag}_2 {S}$ in dil. ${NaCN}$

Reason (R): Continuous air blow oxidises ${Na}_2{S}$ to ${Na}_2 {SO}_3$ and prevents reaction between ${Na}_3{S}$ and ${Na}\left[{Ag}({CN})_2\right]$

Which is not employed for refining of metal?

Forth floatation method is successful in separating impurities from ores because

The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the hall process is
(Atomic mass of Al=27)

The purest zinc is made by

Which of the following will show Tyndall effect

Correct statement is

Hydrometallurgy is based on