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70 gms of a metal oxide on reduction pro...

70 gms of a metal oxide on reduction produced 54 gms of metal. The atomic weight of the metal is 81. What is its valency?

Text Solution

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The correct Answer is:
3
wt. of metal oxide = 70 g
wt. of metal = 54 g
`therefore` wt of oxygen = `70-54=16g`
`(W_(1))/(W_(2))=(E_(1))/(E_(2)),("wt of metal")/("wt of oxygen")=("EQ wt of metal")/("EQ wt of oxygen")`
`(54)/(16)=(E)/(8)impliesE=27`
At. Wt = EQ wt `xx` valency
`81=27xx` valency implies Valency = 3
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