If an upward arrow ↑ is written after a product in a chemical equation, which observation does it indicate?
Answer and explanation
Correct answer: Evolution of a gas
The upward arrow next to a product is a conventional state or observation symbol showing that a gas is evolved during the reaction. The gas may be noticed as bubbles escaping from the mixture, so option A is correct. A downward arrow is used for a precipitate in the usual school notation. Freezing and melting are phase changes, not the meaning of this reaction symbol.
Frequently asked questions
What is the correct answer to this question?
Evolution of a gas
Why is this the correct answer?
The upward arrow next to a product is a conventional state or observation symbol showing that a gas is evolved during the reaction. The gas may be noticed as bubbles escaping from the mixture, so option A is correct. A downward arrow is used for a precipitate in the usual school notation. Freezing and melting are phase changes, not the meaning of this reaction 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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