Question

When hydrogen is burned in the presence of oxygen it will form water, as per the equation: 2H2 + O2 -> 2H2O. Which types of reactions does this fall under?

I. synthesis
II. decomposition
III. single replacement
IV. double replacement
V. combustion



A. I, II, and III
B. I and V
C. II, III, and IV
D. II and IV

Answer 1

Answer:

B

Explanation:

Hydrogen is synthesized to water by adding Oxygen.

Hydrogen is oxidised to water by combustion ( burning in presence of oxygen).

Answer 2

$2H_2 + O_2$.  → $2H_2O$ fall under synthesis and combustion types of reactions. Hence, option B is correct.

What is a synthesis reaction?

Synthesis reactions are reactions that occur when two different atoms or molecules interact to form a different molecule or compound.

Hydrogen is synthesized into the water by adding Oxygen.

Hydrogen is oxidised to water by combustion ( burning in presence of oxygen).

Hence, option B is correct.

Learn more about the synthesis here:

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