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Answers of Unsolved worksheet Q 4

  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
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  Important Points  👀 Metallurgy is defined as  a process that is used for the extraction of metals in their pure form.    👀 The compounds of metals mixed with soil, limestone, sand, and rocks are known as minerals. 👀 Metals are commercially extracted from minerals at low cost and minimum effort. These minerals are known as ores.     👀 The concentration of ores:      👀 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)  →...
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