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Standard IX
Chemistry
Compounds
Question

When hydrogen and oxygen combine to form water, they form:
  1. an unstable compound
  2. a stable mixture
  3. an unstable mixture
  4. an extremely stable compound

A
an unstable mixture
B
an unstable compound
C
an extremely stable compound
D
a stable mixture
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Solution
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When hydrogen and oxygen combine to form water, they form water an extremely stable compound. We can say water is a stable compound because tremendous energy is released is a signal that it is very hard to break water molecules into the original components.

2H2+O2⟶2H2O

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