Question

Which of the following statement is incorrect for a chemical reaction? (a) Heat may be given out but never absorbed. (b) The sound may be produced. (c) A color change may take place. (d) A gas may be evolved.

• A. Heat may be given out but never absorbed.
• B. The sound may be produced.
• C. A colour change may take place.
• D. A gas may be evolved.

Answer 1

The correct option is A

Heat may be given out but never absorbed.

Explanation:

1. A chemical reaction is a process by which two or more molecules interact to produce new products.
2. Compounds that interact to form new compounds are referred to as reactants, while the newly formed compounds are referred to as products.
3. A chemical change must occur in a chemical reaction, which is commonly observed with physical changes such as precipitation, heat production, color change, and so on.
4. A reaction can occur between two atoms, ions, or molecules in which they form a new bond without destroying or creating an atom, but a new product is formed from reactants.
5. The rate of reaction is affected by factors such as pressure, temperature, and reactant concentration.

Hence, Option(A) is correct.