Metallurgy

Refining using liquation method is the most suitable for metals with :

The metal that is not extracted from its sulfide ore is

Which of the following methods are not used to refine any metal?

A. Liquation
B. Calcination
C. Electrolysis
D. Leaching
E. Distillation

Choose the correct answer from the options given below:

Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores if iron is ______.

Which of the reaction is suitable for concentrating ore by leaching process ?

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R

Assertion A : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state.

Reason R : The value of $\Delta G^\ominus$ becomes more on negative side as entropy is higher in liquid state than solid state.

In the light of the above statements, choose the most appropriate answer from the options given below

In metallurgy the term "gangue" is used for :

In liquation process used for tin (Sn), the metal

Match List I with List II

Choose the correct answer from the options given below :

The correct statement(s) related to the metal extraction processes is(are)

Which of the following ore is concentrated using group 1 cyanide salt ?

Al$_2$O$_3$ was leached with alkali to get X. The solution of X on passing of gas Y, forms Z. X, Y and Z respectively are :

Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?

Tin is obtained from cassiterite by reduction with coke. Use the data given below to determine the minimum temperature (in K) at which the reduction of cassiterite by coke would take place.

At 298 K: $\Delta_fH^0(\ce{SnO2}(s)) = -581.0\ \mathrm{kJ\,mol^{-1}}$, $\Delta_fH^0(\ce{CO2}(g)) = -394.0\ \mathrm{kJ\,mol^{-1}}$,

$S^0(\ce{SnO2}(s)) = 56.0\ \mathrm{J\,K^{-1}mol^{-1}}$, $S^0(\ce{Sn}(s)) = 52.0\ \mathrm{J\,K^{-1}mol^{-1}}$,

$S^0(\ce{C}(s)) = 6.0\ \mathrm{J\,K^{-1}mol^{-1}}$, $S^0(\ce{CO2}(g)) = 210.0\ \mathrm{J\,K^{-1}mol^{-1}}$.

Assume that the enthalpies and the entropies are temperature independent.

Calamine, malachite, magnetite and cryolite, respectively, are

The cyanide process of gold extraction involves leaching out gold from its ore with $\ce{CN-}$ in the presence of Q in water to form R. Subsequently, R is treated with T to obtain Au and Z. Choose the correct option(s)

Galena (an ore) is partially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of $\mathrm{O_2}$ consumed is ____.

(Atomic weights in g mol$^{-1}$: O = 16, S = 32, Pb = 207)

The following reaction occurs in the Blast Furnace where iron ore is reduced to iron metal :
$$\ce{Fe2O3(s) + 3CO(g) <=> 2Fe(l) + 3CO2(g)}$$
Using the Le Chatelier's principle, predict which one of the following will not disturb the equilibrium ?

Extraction of copper from copper pyrite $(\ce{CuFeS2})$ involves

Galvanization is applying a coating of :