Understanding Physical and Chemical Changes

This question asks us to evaluate the truthfulness of two statements regarding physical and chemical changes in matter. Let's break down each statement:

Statement I Analysis: Physical Change

The first statement claims: "In physical change new substance is formed."

Aphysical changeis a change in the form or appearance of a substance, but it does not alter its chemical composition. During a physical change, the molecules of the substance remain the same. Examples include melting ice (water stays H₂O), boiling water (water stays H₂O), cutting paper, or dissolving sugar in water (sugar molecules are still C₁₂H₂₂O₁₁, just dispersed).

Therefore, the statement that a new substance is formed during a physical change is false.

Statement II Analysis: Chemical Change

The second statement claims: "In chemical change no new substance is formed."

Achemical change, also known as a chemical reaction, involves the rearrangement of atoms and molecules to form one or more new substances with different chemical properties than the original substances. Examples include burning wood (producing ash, carbon dioxide, water vapor), rusting of iron (forming iron oxide), or baking a cake (ingredients transform into new compounds).

The defining characteristic of a chemical change is precisely the formation of new substances. Thus, the statement that no new substance is formed during a chemical change is false.

Conclusion on Statements

Based on the analysis:

• Statement I is false.
• Statement II is false.

Since both statements I and II are false, the correct option is the one that states neither statement is true.

Identifying the Correct Option

The options provided are:

• Neither I nor II
• Both I and II
• Only II
• Only I

As we determined that both Statement I and Statement II are false, the correct choice is that Neither I nor II are true.