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  4. Sulphide ion is soft base and its ores are common for metals. (a) Pb (b) Al (c) Ag (d) Mg Choose the correct answer from the options given below

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Q. Sulphide ion is soft base and its ores are common for metals.
(a) $Pb$
(b) $Al$
(c) $Ag$
(d) $Mg$
Choose the correct answer from the options given below

JEE MainJEE Main 2021General Principles and Processes of Isolation of Elements

Solution:

$Pb$ and $Ag$ commonly exist in the form of sulphideore like $PbS$ (galena) and $A g_{2} S$ (Argentite)
'$Al$' is mainly found in the form of oxide orewhereas '$Mg$' is found in the form of halide ore.