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Practice QuestionsMCQ (More than One Correct Answer)
MCQ (Single Correct Answer)
1
Extraction of a metal (M) from its sulphide ore (M2S) involves the following chemical reactions
$$2{M_2}S + 3{O_2}\buildrel {Heat} \over \longrightarrow 2{M_2}O + 2S{O_2} \uparrow $$
$${M_2}S + 2{M_2}O\buildrel {Heat} \over \longrightarrow 6M + S{O_2} \uparrow $$
The metal (M) may be
$$2{M_2}S + 3{O_2}\buildrel {Heat} \over \longrightarrow 2{M_2}O + 2S{O_2} \uparrow $$
$${M_2}S + 2{M_2}O\buildrel {Heat} \over \longrightarrow 6M + S{O_2} \uparrow $$
The metal (M) may be
WB JEE 2021
2
In the Bayer's process, the leaching of alumina is done by using
WB JEE 2019
3
A copper coin was electroplated with Zn and then heated at high temperature until there is a change in colour. What will be the resulting colour?
WB JEE 2019
4
The metal which can be used to obtain metallic Cu from aqueous CuSO4 solution is
WB JEE 2016