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Pearl
Subject: Chemistry
, asked on 3/3/17
write short notes on a) poling
b) aluminothermic process
Answer
1
Pearl
Subject: Chemistry
, asked on 3/3/17
what happens when powder of sulphide ore of silver is shaken with dil soln of nacn?
Answer
2
Pearl
Subject: Chemistry
, asked on 3/3/17
write briefly the steps to extract lead from galena. write chem rxn involved.
Answer
1
Pearl
Subject: Chemistry
, asked on 3/3/17
which method would you suggest for the separation of metals in following mixtures?
a) zn and fe
b) cu and mg
c) rare earth
Answer
2
Pearl
Subject: Chemistry
, asked on 3/3/17
name the metals which are associated with the following terms in their extraction from ores?
a) Bessemer convertor
b) blast furnace
c) aluminothermic process
d) magnetic separation
Answer
1
Yash
Subject: Chemistry
, asked on 19/9/17
what metals are generally extracted by the electrolytic processes? what positions do these metals generally occupy in the periodic table?
Answer
2
Pearl
Subject: Chemistry
, asked on 3/3/17
what methods are employed for concentration / purification of following ores:
a) tin
b)aluminium
c)iron
Answer
1
Pearl
Subject: Chemistry
, asked on 3/3/17
giving appropriate examples (3 atleast) explain how the reactivity of metal is related to its mode of occurance in nature.
Answer
1
Pearl
Subject: Chemistry
, asked on 3/3/17
discuss some of the factors which need consideration before deciding extraction of metal from its ore. pls explain as if your answer would be accepted by cbse board examiners :)
Answer
1
Pearl
Subject: Chemistry
, asked on 3/3/17
u r provided with samples of some impure metals such as zinc, copper, ge. which methods would u recommend for the purification of each of these metals?
Answer
1
Pearl
Subject: Chemistry
, asked on 3/3/17
why is fe an abundant element of earth and why are the elements with higher atomic numbers increasingly rare? pls explain as if your answer would be accepted by cbse board examiners :)
Answer
2
Pearl
Subject: Chemistry
, asked on 3/3/17
of the metals, ca, pb, al and cu, which one is extracted from its ore by electrolytic method and why?
Answer
1
Pearl
Subject: Chemistry
, asked on 3/3/17
name the ions which form black ppt when h2s is passed through acidified solution of salt.
Answer
1
Pearl
Subject: Chemistry
, asked on 3/3/17
what is principle of seperation of metal ions in qualitatve analysis? pls explain as if your answer would be accepted by cbse board examiners :)
Answer
1
Ankur Agrawal
Subject: Chemistry
, asked on 28/2/17
Explain a
17. a) Which of the following metals cannot be extracted by the smelting process; Al, Zn, Fe and Pb ? Give reasons.
Answer
1
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What are you looking for?
b) aluminothermic process
a) zn and fe
b) cu and mg
c) rare earth
a) Bessemer convertor
b) blast furnace
c) aluminothermic process
d) magnetic separation
a) tin
b)aluminium
c)iron
17. a) Which of the following metals cannot be extracted by the smelting process; Al, Zn, Fe and Pb ? Give reasons.