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Why does the colour of copper sulphate solution change when an iron nail is dipped in it? Write chemical equation for the reaction involved. AnswerIron is more reactive than copper so it displaces copper from copper sulphate solution and forms iron sulphate, hence the colour of solution changes
Equation: Fe + CuSO4 (aq) → FeSO4 (aq) + CuO
a) Explain the term "rancidity." Name the type of chemical reaction responsible for causing rancidity and define it. (b) Write three methods for preventing rancidity of food.AnswerWe have seen food getting contaminated and having an unpleasant smell if it is left open in summer. In a hot weather, Oil present in food get oxidized and become Rancid. Such food is not recommended for consumption. The food is getting oxidized so the reaction is oxidation reaction.Methods for preventing food from getting oxidized are:-(a) Food is kept in cool place like refrigerator.(b) Packaging should be air tight(c) Antioxidants should be added to food
What happens chemically when quick lime is added to water?
Ans. When quick lime is added to water calcium hydroxide (slaked lime) is formed with a hissing sound and lot of heat is evolved during the reaction. The reaction involved is CaO (s) + H2O(Quick Lime) Ca (OH) 2 (s) + Heat (Shaked Lime)
Why should a magnesium ribbon be cleaned before burning in air?
Ans. Magnesium ribbon is cleaned before burning to remove the protective layer of basic magnesium carbonate from the surface of magnesium ribbon.
Give an example of a double displacement reac।।
Solution:
Reaction Between silver nitrate (AgNO3) and Sodium chloride (NaCl) is an example of double displacement reaction. During the reaction negative and positive ions trade positions as a result in the formation of white silver chloride precipitate. The chemical reaction is given below.
Ag+ + NO3– + Na+ + Cl– → AgCl + Na+ + NO3–