alleryIn a chemical equation, the symbol $\Delta$ written above the reaction arrow indicates that:
Athe product is a gas
Bthe product is a precipitate
Cheat is supplied from outside
Da catalyst is being used
Answer & Solution
Correct answer: C. heat is supplied from outside
1. Certain reactions need heat to be supplied from outside to take place.
2. This is shown by the sign $\Delta$ written above the arrow that indicates the direction of the reaction.
3. A catalyst or temperature condition is written below or above the arrow as text, not as $\Delta$.
4. A gaseous product is shown by $\uparrow$ and a precipitate by $\downarrow$, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.41_
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