EASY
JEE Main
IMPORTANT
Earn 100

Which one of the following ores is best concentrated by froth flotation method?
 

50% studentsanswered this correctly

Important Questions on General Principles and Processes of Isolation of Metals (Metallurgy)

EASY
JEE Main
IMPORTANT
The number of correctly matched combination is/are
 
Ore Element
Chalcopyrite Cu
Limestone Ca
Corundum Al
Magnetite Fe
Pyrolusite Mn
Cassiterite Sn
Cinnabar Hg
Calamine Ca
Siderite Zn
Cerussite Ce
EASY
JEE Main
IMPORTANT

How many of the following metals can be extracted by auto-reduction?

 Fe,  Zn, Pb, Al, Hg, Cu, K, Ca .

EASY
JEE Main
IMPORTANT

There are many minerals of zinc present in nature and some of this are - Zinc blende, willemite, franklinite, zincite and calamine . One of these minerals of zinc contains metal, nonmetal and metalloid elements in its chemical formula. The total number of atoms present per molecule in this mineral is_____.

EASY
JEE Main
IMPORTANT

The total number of oxide minerals of iron in the following are - 

Haematite, iron pyrites, siderite, magnetite, limonite

EASY
JEE Main
IMPORTANT

How many of the following are methods to concentrate ores?

Gravity separation, magnetic separation, chromatography, froth floatation process, polling

EASY
JEE Main
IMPORTANT

How many of the following are methods used for the purification of crude metals?

Distillation, zone refining, roasting, electrolytic refining, liquation

EASY
JEE Main
IMPORTANT

How many number of metals from the following which are refined by Van Arkel method?

  Zr, Zn, Cu, Ag, Al, Ti, Ni

EASY
JEE Main
IMPORTANT

Calcination can be employed for the how many of the following ores?

 - Limonite, siderite, zincite, zinc blende, calamine, cryolite, wolframite, cassiterite.