Related Questions

Which one of the following resists hydrogen sulphide corrosion?
A R.C.C.
B Glazed stone wares
C Asbestos cement
D Glazed ware
Stainless steel resists corrosion due to
A Carbon
B Sulphur
C Vanadium
D Chromium
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains
A Hydrogen sulphide
B Carbon dioxide
C Methane
D Oxygen
A solution which resists change in its pH value on addition of acid/alkali is called the __________ solution.
A Neutral
B Ideal
C Buffer
D Zero pH
Corrosion involves exchange of electrons in __________ corrosion.
A Chemical
B Electrochemical
C Both A & B
D Neither A nor B
The alloying element which reduces the formation of iron sulphide in steel is
A Chromium
B Nickel
C Vanadium
D Manganese
Which of the following metals can not be extracted by pyrometallurgical process from its sulphide ore?
A Copper
B Mercury
C Lead
D None of these
Which of the following alloying elements reduces the formation of iron sulphide in steel?
A Cobalt
B Nickel
C Manganese
D Vanadium
The product (s) of roasting of a sulphide ore is (are)
A Oxide only
B Sulphate only
C Oxide and sulphate
D Dependent on temperature and partial pressure of oxygen & sulphur dioxide
Concentration of sulphide ores is done usually by
A Roasting
B Smelting
C Froth floatation
D Electro magnetic separation

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