As Level Chemistry Mcq help!

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What is the approximate change in the HCH bond angle in ethene when it reacts with hydrogen.
CH2=CH2 + H2 ----Ni------ CH3-CH3

A:30°
B:15°
C:10°
D:0°
I need explaination as well pls!.Thanks
:).
I think the answer is 10°.
 
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