Thermodynamic principles of metallurgy - class-XII
Description: thermodynamic principles of metallurgy | |
Number of Questions: 87 | |
Created by: Manjit Singh | |
Tags: metallurgy chemistry general principles and processes of isolation of elements |
Hardened steel on heating in the range of $220^{\circ} C$ to $330^{\circ}C$ and on slow cooling gives :
Iron filings were added to a solution of copper sulphate. After 10 minutes, it was observed that the blue colour of the solution changes and a layer gets deposited on iron filings. The colour of the solution and that of the coating would, respectively, be -
In the extraction of iron, the most preferred ores are :
In which of the following pair of metals, both are commercially extracted from their respective ores by carbon reduction method?
Permanent magnets can be made from :
In the metallurgy of iron using blast furnace, the slag is :
If steel is heated bright red hot and is then cooled slowly, the process is called:
Electromagnets are used to concentrate _______ ores :
Iron :
The metal which is present in our body in red blood corpuscles and whose deficiency in the body causes anaemia is
Due to extreme high pressure, iron exist in:
Which of the following metals can be used for sharp casting?
(a) Cast iron is very hard and brittle because of higher carbon content.
(b) Iron obtained from the blast furnace is know as pig iron.
(c) The carbon content in wrought iron is the least.
(d) The melting point of cast iron is higher than that of wrought iron.
Which of the following regarding the above statements is correct?
The reaction which is not associated with the middle region of blast furnace during smelting is _______ .
Which of the following gives black precipitate with $H _{2}S$ ?
Which of the following processes is involved in the smelting process?
In the metallurgical extraction of iron, which of the following processes takes place in reverberatory furnace?
The electrolytic reduction technique is used in the extraction of:
Which of the following oxides cannot be reduced by coke?
Which of the following is not correctly matched?
$Zn$ cannot displace following ions from ions of which aqueous solution?
Which one of the following is not a method of concentration of ore?
Name the substance which remains in a test tube after heating ferrous sulphate.
Heating mixture of $Cu _2O$ and $Cu _2S$ will give:
The iron manufactured by pudding process is called an
In extractive metallurgy of zinc partial fusion of ZnO with coke is called ______ and reduction of the ore to the molten metal is called________ .
Carbon reduction method is employed for commercial extraction of :
Highly electropositive metals cannot be extracted by carbon reduction process because, these:
For which of the following metal, the carbon reduction cannot be used?
Of the following reduction processes, correct processes are :
Metals which can be extracted by smelting process are :
The disadvantage of carbon reduction method are :
Pyrometallurgical method used for the extraction of copper from sulphide ore:
Write chemical equations for metallurgical processes to represent the reduction of $Cu _2O$ using charcoal as a reducing agent :
Chemical reactions of the hydrometallurgical extraction of copper is/are?
Of the following reduction processes, correct processes are:
$AgCl$ (horn silver) is converted into $Ag$ by the pyrometallurgical method.
By annealing, steel :
When $FeCr _2O _4$ is heated with carbon an alloy called ferrochrome is obtained.
In iron metallurgy, lime stone is used :
During smelting, an additional substance is added which combines with impurities to form a fusible product. It is known as :
The pyrometallurgical operations involve the use of:
Hydro-metallurgical process of extraction of metals is based on :
For the pyrometallurgical method used for the extraction of copper from sulphide ore, which statement(s) is/are correct?
Smelting involves reduction of metal oxide with:
Copper can he extracted by hydrometallurgy but not zinc because:
Metals which can be extracted by smelting process is/are:
Mercury containers are made of :
Which of the following process involves smelting?
During the extraction of copper, the impurity (FeS) is removed as slag by mixing the contaminated copper ore with silica and coke. The molecular formula of slag is:
Aluminum metal is frequently used as a reducing agent for the extraction of metal such as chromium or manganese from their respective _______
The metallurgical process in which a metal is obtained in a fused state is called:
Which one is mismatched ?
Haematite is an ore of :
$Fe _3O _4$ is the chemical formula of :
Which metal among the following is present in human blood?
Which of the following reaction represents the action of steam on heated iron?
Which of the following is purest form of iron?
The smelting of iron in a blast furnace involves all the following processes except :
Which of the following methods is used in the concentration of haematite ore?
Which of the following is not an illustration of a smelting method?
(a) In smelting process carried out in blast furnace for the exgtraction of iron, lower region of the furnace has the highest temperature.
(b) Formation of $CO$ from ${CO} _{2}$ and coke reduces the temperature of the middle region of blase furnace.
(c) Limestone is taken blast furnace as flux.
(d) Silica present in the ore as gangue is converted to fusible slag by the process of reduction
Which of the following regarding the process of smelting is correct?
The manufacture of iron from iron ore involves the process of :
Nitriding is a process of heating steel in atmosphere of:
(a) Thermite welding process exploits the difference in reactivity of different metals.
(b) Zinc spelter is used as cathode in electrolyte refining process of zinc.
(c) Iron is generally refined by electrolytic reduction process
(d) Iron is alloyed with other metals and carbon, only to prevent corrosion.
Which of the following options regarding the above statements is correct?
The percentage of carbon is the least in :
Iron reacts with _______.
Oven coke is used throughout the world in blast furnaces to make:
The purpose of smelting an ore is to _________ it.
Which of the following processes involves the smelting process?
In the extraction of iron, slag is produced which is
Which of the following methods is not involved in metallurgy of iron?
Iron is an essential nutrient for plants, which absorb it from the soil. Iron deficiency is often found in wet, clayey soils that have a high content of:
Iron is used in different forms, like, cast iron, steel, and alloys. The iron-carbon diagram is the basis for the branch of science known as:
Magnetic ceramics or ferrites contain compounds of iron. These have been used:
Which of these compounds does not exist?
In which of the following pair(s), the minerals are converted in to metals by self-reduction process?
Of the following reduction processes :
I. $Fe _2O _3\, +\, C\, \rightarrow\, Fe$
II. $ZnO\, +\, C\, \rightarrow\, Zn$
III. $Ca _3(PO _4) _2\, +\, C\, \rightarrow\, P$
IV. $PbO\, +\, C\, \rightarrow\, Pb$
Correct processes are :Which of the following steps are involved in hydrometallurgical process?
Which of the following can be obtained by hydrometallurgy :
Formation of metallic copper from the sulphide ore in the normal thermo-metallurgical process essentially involves which one of the following reaction?
Match the column I with column II and mark the appropriate choice.
Column I | Column II | ||
---|---|---|---|
(A) | Electrical industry | (i) | Zinc |
(B) | Batteries | (ii) | Steel |
(C) | Gutter pipes | (iii) | Copper |
(D) | Gas stove | (iv) | Cast iron |