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Here is the solution to the provided questions:

1. **Additive identity for rational numbers**:
   The additive identity is the number that, when added to any rational number, leaves the number unchanged. For rational numbers, this identity is:
   - **Answer: a. 0**

2. **Classify the given figure on the basis of suitable polygon**:
   The given figure appears to be a polygon where at least one interior angle is greater than 180°, making it a concave polygon.
   - **Answer: a. Concave polygon**

3. **A number ending with ___________ number of zeros is never a perfect square**:
   A number that ends in an odd number of zeros cannot be a perfect square.
   - **Answer: b. Odd**

4. **Tally of the number 5 is**:
   The tally mark representation of the number 5 is a group of four vertical lines with a diagonal line through them.
   - **Answer: a.  𝍃**

5. **On which item was the expenditure maximum?**:
   From the pie chart, the largest section is labeled "Food" at 25%, making it the category with the highest expenditure.
   - **Answer: a. On food**

Would you like more details or have any questions on the solutions? Here are some follow-up questions:

1. What is the significance of the additive identity in mathematics?
2. How can you distinguish between concave and convex polygons?
3. Why can't a number with an odd number of zeros be a perfect square?
4. How are tally marks used in real-world applications?
5. What could be the reasons behind food being the largest expenditure category in many households?

**Tip**: Always remember that the additive identity leaves the original value unchanged when added to it!

1. Additive identity for the rational numbers.
2. Classify the given figure on the basis of suitable polygon.
3. A number ending with ___________ number of zeros is never a perfect square.
4. Tally of the number 5 is ____.
5. On which item was the expenditure maximum?

This set of math problems covers a variety of topics including the additive identity for rational numbers, classification of polygons, properties of numbers ending in zeros for perfect squares, tally marks, and interpreting pie charts to identify maximum expenditure. Suitable for Grades 5-8.

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