Explanation

• “Has lived” is the structure of the Present Perfect Tense.
• It describes an action that started in the past and has a connection with the present.

Last verified on 03-09-2026

Explanation

• Necessary means ضروری

Last verified on 09-02-2026

Explanation

• Millennium means ہزار برس

Last verified on 08-06-2026

Explanation

• Committee means پنچایت

Last verified on 03-09-2026

Explanation

• Prepositions are used to connect words and show relationships.
• The phrase “afraid” is commonly used to show fear.
• The correct preposition after “afraid” is “of”.
• It is used to express fear of a person, thing, or situation.

Last verified on 04-05-2026

Explanation

• Ammonia chemical formula is NH₃.
• It is a chemical compound made of nitrogen and hydrogen.
• It is a colorless gas with a strong, pungent smell.
• It is widely used in fertilizer production and various industrial processes.

Last verified on 03-09-2026

Explanation

• Quicklime chemical formula is CaO.
• It is chemically known as calcium oxide.
• It is produced by heating limestone (CaCO₃) strongly.
• Quicklime reacts with water to form slaked lime, Ca(OH)₂.

Last verified on 03-09-2026

Explanation

Explanation

• Bleaching powder: CaOCl₂
• Chemical name: Calcium oxychloride.
• Main uses: Bleaching and disinfection.
• CaCl₂: Calcium chloride.
• Ca(OH)₂: Calcium hydroxide (slaked lime).

Last verified on 03-09-2026

Explanation

• Vinegar mainly contains acetic acid (ethanoic acid) dissolved in water.
• The chemical formula of acetic acid is CH₃COOH.
• Household vinegar usually contains about 4–8% acetic acid.
• It gives vinegar its characteristic sour taste and sharp smell.

Last verified on 03-09-2026