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For the gas phase reaction C2H4 + H2 iff...

For the gas phase reaction `C_2H_4 + H_2 iff C_2H_6 DeltaH = -136.8 kJ mol^-1` carried out in a vessel, the equilibrium concentration of `C_2H_4` can be increased by

A

increasing the temperature

B

decreasing the pressure

C

removing some `H_2`

D

adding some `C_2H_6`

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The correct Answer is:
A, B, C, D
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