A) Pyrolusite
B) Malachite
C) Diaspore
D) Cassiterite
Correct Answer: B
Solution :
Pyrolusite ? \[Mn{{O}_{2}}\] Malachite ? \[CuC{{O}_{3}}.Cu{{\left( OH \right)}_{2}}\] Diaspore ? \[A{{l}_{2}}{{O}_{3}}.{{H}_{2}}O\] Cassiterite ? \[Sn{{O}_{2}}\]
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