In the formation of ammonium ion (NH₄⁺) from NH₃ and H⁺, the type of bond formed is: MCQ with Answer and Explanation

Explanation:
Fermentation is an anaerobic biological process in which enzymes (zymase) convert glucose to ethanol and CO₂: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂. Oxidation would require oxygen. Esterification forms esters, saponification makes soap. Fermentation is used in brewing, winemaking, and baking (where CO₂ makes bread rise). The temperature is kept around 30-35°C.

Explanation:
Noble gases have completely filled valence shells (ns²np⁶, except He which is 1s²), making them highly stable and unreactive with a valency of zero. Because of this unique stability and distinct electronic configuration, they form a separate group, Group 18, in the modern periodic table.

Explanation:
Steel is an alloy of iron with controlled amounts of carbon (0.02-2.1%) and often other elements like manganese, chromium, nickel, etc. Cast iron contains 2-4% carbon. In steelmaking (Bessemer, LD process), impurities like excess carbon, silicon, manganese, sulfur, phosphorus are oxidized and removed, then desired carbon and alloying elements are added to achieve specific properties.