Question

1. Hydrogen and oxygen are both colourless gases. When
a mixture of hydrogen gas and oxygen gas is heated
an explosion occurs. On cooling, a colourless liquid is
obtained. The colourless liquid is a compound because
during its formation,
(a) a change in state has taken place.
(b) a change in energy occurs.
(c) no colour change occurs.
(d) an expansion and contraction in volume occurs. ​

Answer 1

Answer:

b) I think once you check

Answer 2

Answer

a or b or c or d

Explanation:

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