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An unknown compound A dissociates at 500...

An unknown compound A dissociates at `500^(@)C` to give products as follows -
`A ( g) hArr B(g) + C(g) + D(g)`
Vapour density of the equilibrium mixture is 50 when it dissociates to the extent to 10% . What will be the molecular weight of compound A-

A

120

B

130

C

134

D

140

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A
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