1
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Question

# The oxide of a metal contains 40% of oxygen. The valency of metal is 2. What is the atomic weight of the metal?

A
24
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B
12
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C
40
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D
36
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Solution

## The correct option is A 24100 g of metal oxide will contain 40 g oxygen and 60 g metal.Number of moles of oxygen 40g16g/mol=2.5molThe valency of metal is 2. The formula of metal oxide will be MO. Hence, number of moles of metal = number of moles of oxygen =2.5molThe atomic weight of the metal is- 602.5=24g/mol.So, the correct option is A

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