Explanation

• Marie Curie is the only person to win Nobel Prizes in two different natural sciences.
• She won the Nobel Prize in Physics in 1903.
• She won the Nobel Prize in Chemistry in 1911.
• She was awarded for her pioneering work on radioactivity.

Last verified on 06-09-2026

Explanation

• Aldehydes give a silver mirror test with Tollens' reagent.
• Tollens' reagent contains the diamminesilver(I) ion, [Ag(NH₃)₂]⁺.
• The aldehyde is oxidized to a carboxylic acid/carboxylate, while Ag⁺ is reduced to metallic silver.
• The deposited silver forms a shiny silver mirror on the test tube.

Last verified on 05-09-2026

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