Classify the following processes as physical or chemical changes: (a) Beating of aluminium metal to make aluminium foil (b) Digestion of food (c) Cutting of a log of wood into pieces (d) Burning of cr

Here's the classification of the processes:

• (a) Beating of aluminium metal to make aluminium foil: This is a physical change because the chemical composition of aluminium remains the same; only its shape changes.
• (b) Digestion of food: This is a chemical change because complex food molecules are broken down into simpler substances through chemical reactions.
• (c) Cutting of a log of wood into pieces: This is a physical change because the wood is merely divided into smaller pieces; its chemical nature does not change.
• (d) Burning of crackers: This is a chemical change because burning involves combustion, which produces new substances like gases, ash, and light/heat.

Based on this, the classification is:

• Physical changes: (a), (c)
• Chemical changes: (b), (d)

Comparing this with the given options:
A. Physical: (a), (c); Chemical: (b), (d)
B. Physical: (a), (b); Chemical: (c), (d)
C. Physical: (a), (c), (d); Chemical: (b)
D. Physical: (c) only; Chemical: (a), (b), (d)

The correct option is A.

The final answer is $\boxed{\text{A}}$