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

Mond process is used in the extraction of:

In the manufacture of iron from haematite, lime stone is added to act as:

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

Other forms of iron can be produced from:

Gold is extracted using:

Blister copper is

Which one of the following statements is false?

Identify the correct statement from the following:

Assertion: All the ores are mineral

Reason: Ores contains metals in combined state

In blast furnace, iron oxide is reduced by

The metal which is not purified by vapour phase refining is

Upon heating with $\mathrm{Cu_2 S}$, the reagent(s) that do not give copper metal is:

Identify the statement which is not correct for copper sulphate:

Which of the following becomes paramagnetic on heating at $850 \mathrm{~K}$ ?

The slag obtained during the smelting process in the extraction of copper from copper pyrites is composed mainly of:

In the process of extraction of gold,

Roasted gold ore

$+ \mathrm{C}{\mathrm{N}^ - }\mathrm{\;} + \mathrm{\;}{\mathrm{H}_2}\mathrm{O\;}\mathop \to \limits^{{\mathrm{O}_2}} \mathrm{\;}\left[ X \right]\mathrm{\;} + \mathrm{\;O}{\mathrm{H}^ - }$

$\left[ X \right]\mathrm{\;} + \mathrm{\;Zn\;} \to \mathrm{\;}\left[ Y \right]\mathrm{\;} + \mathrm{\;Au}$

Identify the complexes [X] and [Y]

When the sample of with $\mathrm{Zn}$ impurity is to be purified by electrolysis, the appropriate electrodes are:
Cathode Anode

In which of the following method of purification, metal is converted to its volatile compound which is decomposed to give pure metal?
(a) Heating with stream of carbon monoxide
(b) Heating with iodine (c) Liquation (d) Distillation
Correct options are

Percentage of gold in Fool’s gold is

Which of the following ore is an ore of copper?

Assertion: In the smelting of copper ore coke is added in the blast furnace.

Reason: Coke reduces, $\mathrm{CuO}$ into $\mathrm{Cu}$.

Match the extraction process listed in column I with metals listed in column II.

Column I Column II

A. Self reduction (P) Lead

B. Carbon reduction (Q) Silver

C. Complex formation and (R) Copper

displacement by metal

D. Decomposition of iodide (S) Boron

Assertion : Zone refining is based on the fact that impurities are more soluble in molten state than in solid in the presence of oxygen.
Reason : This method is used to prepare pure metal oxides.

Plumbo-solvency refers to:

Consider the following reaction occurring in the blast furnace.

$\mathrm{Fe}_3 \mathrm{O}_{4(\mathrm{s})}+4 \mathrm{CO}_{(\mathrm{g})} \rightarrow 3 \mathrm{Fe}_{({l})}+4 \mathrm{CO}_{2(\mathrm{g})}$

'x' kg of iron is produced when $2.32 \times 10^3 \mathrm{~kg}$ $\mathrm{Fe}_3 \mathrm{O}_4$ and $2.8 \times 10^2 \mathrm{~kg}$ $\mathrm{CO}$ are brought together in the furnace. The value of 'x' is ____. (nearest integer)

{Given:

Molar mass of $\mathrm{Fe}_3 \mathrm{O}_4=232 \mathrm{~g} \mathrm{~mol}^{-1}$

Molar mass of $\mathrm{CO}=28 \mathrm{~g} \mathrm{~mol}^{-1}$

Molar mass of $\left.\mathrm{Fe}=56 \mathrm{~g} \mathrm{~mol}^{-1}\right\}$

Work is being performed, when a weight lifter lifts a base ball off a weight rack. This is due to

The metal which is refined by liquation is

Mixture of chlorides of copper, cadmium, chromium iron and aluminium was dissolved in water acidified with ${HCl}$ and ${H}_2{S}$ gas was passed for a sufficient time. It was filtered boiled and a few drops of nitric acid were added while boiling. To this solution ammonium chloride and sodium hydroxide were added and filtered. The filtrate would give test for

Assertion (A) Carbonate and hydroxide ores are concentrated by frothfloatation process.

Reason (R) In froth floatation process, mineral oil is used due to itpreferentially wets the gangue particles.

Fe ore is concentrated by: