4. Unsolved question.. Previous One:- Mention the type of chemical reaction that takes place when: (i) a magnesium ribbon is burnt in air.- Combination Reaction (ii) limestone is heated.- Thermal decomposition (iii) silver bromide is exposed to sunlight.- Photo Decomposition (iv) electricity is passed through acidified water.- Electric Decomposition (v) ammonia and hydrogen chloride are mixed with each other.- Combination Write the chemical equation for each reaction Complete Answers: i) Combination reaction: 2 M g + O 2 → 2 M g O ii) Thermal Decomposition reaction: C a C O 3 → C a O + C O 2 iii) Photo Decomposition reaction: 2 A g B r → 2 A g + B r 2 iv) Electric Decomposition reaction: 2 H 2 O → 2 H 2 + O 2 v) Combination reaction: N H 3 + H C l → N H 4 C l https://kumarashwanisspace.quora.com/?invite_code=mJAm7EsHIbguzQC3373T
Important Points π Metallurgy is defined as a process that is used for the extraction of metals in their pure form. π The compounds of metals mixed with soil, limestone, sand, and rocks are known as minerals. π Metals are commercially extracted from minerals at low cost and minimum effort. These minerals are known as ores. π The concentration of ores: π Concentration is when we remove the unwanted materials like sand, dust, etc. from the ores, so we get concentrated ore full of our required metals. Roasting : In this process, the ore is warmed in a continuous air supply in the furnace at any temperature lower than their melting point. Eg: 2ZnS + 3O2 → 2ZnO + 2SO2 ( During Sulphide ore Roasting will be there) Calcination : Calcination involves heating when the volatile matter escapes leaving behind the metal oxide. E.g: ZnCO3 (s) → ZnO(s) + CO2 (g) (During Carbonate ore Calcination will be there) https://kumarashwanisspace.quora.com/?invite_code