Explanation

We are asked to find the difference between the largest and smallest 4-digit number.

Step 1: Identify the numbers

Smallest 4-digit number = 1000

Largest 4-digit number = 9999

Step 2: Subtract

9999 − 1000 = 8999

Explanation

A topic sentence introduces the main idea of a paragraph clearly and directly.

"Healthy eating is important" directly sets the focus on the benefits of healthy eating, matching the paragraph's subject.

Explanation

An electrolytic cell uses electric current to drive a chemical reaction (usually decomposition).

This process is called electrolysis, clearly representing the chemical effect of current.

Explanation

The third class in the frequency distribution corresponds to the class limits 15-19, and its frequency is given as 50.

Therefore, the frequency of the third class is 50.

Explanation

قافیہ وہ ہم آواز الفاظ ہوتے ہیں جو ردیف سے پہلے آتے ہیں۔

یہ شعر میں آواز کا تکرار پیدا کرتے ہیں اور ردیف کے ساتھ مل کر حسن بڑھاتے ہیں

Explanation

Zulfiqar Ali Bhutto was hanged for the murder of Nawab Mohammad Ahmad Khan, a political rival, during his time in power.

Bhutto's hanging followed a controversial trial in 1979 under General Zia-ul-Haq's regime.

Explanation

Explanation

In negative sentences, we use "anything" instead of "something" or "nothing."

The phrase "we cannot do anything about it" is grammatically correct.

Explanation

A biographical essay about a deceased person is usually written in the past tense.

This is because it describes events and actions that have already happened in the person's life.

Explanation

Normal salts are formed when all replaceable hydrogen atoms in an acid are replaced by metal ions.

They do not contain any replaceable hydrogen or hydroxyl groups.