In the following the correct answer for metalloids in group 3A and 4A is​

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?

How is the way a mixture is combined different from how a compound is combined?

Anitrogen atom and an oxygen atom combine chemically to form nitric oxide. what is nitric oxide?