Question

A certain metal M occurs in four compounds namely A, B, C, and D. A has 20% of M, B has 68% of M, C has 73% of M and D has 60% of M. If metal M is extracted from A, B, C, and D, it costs Rs 35 per kg, Rs 40 per kg, Rs 100 per kg and Rs 45 per kg respectively. Which mineral can be considered as an effective ore of M?

Answer 1

Answer:

An oxide of a metal (M) contains 40 % by mass of oxygen.

100 g of the oxide will contain 60 g of metal and 40 g of oxygen.

Metal (M) has an atomic mass of 24.

40 g of metal corresponds to

24

60

=2.5mol

Oxygen has an atomic mass of 16.

60 g of oxygen corresponds to

16

40

=2.5mol

Hence, the ratio of the number of moles of metal to oxygen is 1:1.

Explanation:

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