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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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