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Grade: 12


3g of an oxide of a metal is converted into chloride compeletly and it yeilded 5g of chloride.The equivalent wt of metal is

11 years ago

Answers : (2)

Ramesh V
70 Points

here the oxidation state of oxygen is -2

lets take metal O.S as +1 or +2 in two cases with its atomic wt. as X

case 1:

for +1 state, its:        M20 + 2Hcl  ----> 2Mcl + H2O

                                    2x+16                  x+35.5

 so, it shld be 3/(2x+16)  = 2*5/(x+35.5)   where x is negative, so its not possible to metal be in +1 state

case 2:

for +1 state, its:        M0 + 2Hcl  ----> Mcl2 + H2O

                                  x+16                    x+72

 so, it shld be 3/(x+16)  = 5/(x+72) 

 which gives x = 66.5

so, the metal is Zinc

its eq. wt = 33


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11 years ago
33 Points
If we apply POAC(Principle of Atom Conservation) for the first case(ox. state=+1) then a +ve value of x is obtained, while for case 2 x is rightly obtained!
Please clarify.
6 years ago
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