Question

The reaction of h2 gas with o2 gas to form water is an example of
(1) combination reaction
(2) all of these
(3) exothermic reaction
(4) redox reaction

Answer 1

Answer: 2 all of these

Explanation:

Since 2 or more reactants combine to form a single product, proves that it is combination reaction.

Also heat is given out during burning of H2 therefore it is exothermic

while There is addition of hydrogen in oxygen and addition of oxygen to hydrogen so both reduction and oxidation is occurring respectively. But o course all  chemical reactions are example of red-ox reaction as reactions include transfer of electrons are also red-ox reactions

Answer 2

1. It is a combination reaction because two or more reactants combine to form a single product.
2. Also, heat is released during the combustion of $H_{2}$, so it is an exothermic reaction.
3. While there is hydrogen addition in oxygen and oxygen addition in oxygen, both reduction and oxidation are occurring.
4. Thus, it is also a redox reaction.

Hence, option 2 is correct.

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