What does an upward arrow written with a product in a chemical equation indicate?
Answer and explanation
Correct answer: Evolution of a gas
An upward arrow
written with a product indicates that a gas is evolved during the reaction. For example, in
$
ext{Zn} + 2 ext{HCl}
ightarrow
ext{ZnCl}_2 + ext{H}_2
$
, hydrogen gas is evolved. In contrast, a precipitate is conventionally indicated by a downward arrow
.
Frequently asked questions
What is the correct answer to this question?
Evolution of a gas
Why is this the correct answer?
An upward arrow
written with a product indicates that a gas is evolved during the reaction. For example, in
$
ext{Zn} + 2 ext{HCl}
ightarrow
ext{ZnCl}_2 + ext{H}_2
$
, hydrogen gas is evolved. In contrast, a precipitate is conventionally indicated by a downward arrow
.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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