When can an upward arrow be used in a chemical equation?
Answer and explanation
Correct answer: When gas forms and evolves
In a chemical equation, an upward arrow is commonly used to show that a gaseous product is evolved and escapes from the reaction mixture. Therefore option A is correct. A precipitate is an insoluble solid and is conventionally indicated by a downward arrow, not an upward arrow. Freezing and filtration describe physical processes and do not determine this gas-evolution symbol.
Frequently asked questions
What is the correct answer to this question?
When gas forms and evolves
Why is this the correct answer?
In a chemical equation, an upward arrow is commonly used to show that a gaseous product is evolved and escapes from the reaction mixture. Therefore option A is correct. A precipitate is an insoluble solid and is conventionally indicated by a downward arrow, not an upward arrow. Freezing and filtration describe physical processes and do not determine this gas-evolution symbol.
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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