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Sulphide ion is soft base and its ores a...

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

A

(a) and (c )only

B

(a) and (d) only

C

(a) and (b) only

D

(c ) and (d) only

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