Question

Give an example of each of the following chemical
changes.
(a) A reaction involving
(i) change of state (ii) formation of precipitate
(b) An exothermic and an endothermic reaction
involving carbon as one of the reactants.
(c) A reaction where colour change is noticed.​

Answer 1

Answer:

Hi mate here is yr ans.✌

a.1. When an Ice melts.

2.

b. Cao+H2O = Cao (OH)2 Exothermic

c. When iron get corrode.

may It helps you

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@ItsSTRK

Answer 2

Answer:

(a) (i)melting of wax(ii) in chemical reaction b/w lead nitrate and potassium iodide , yellow coloured ppt of lead iodide is formed with potassium nitrate (b)exothermic reaction- repiration in which glucose reacts with oxygen to produce carbon dioxide,water and heat

endothermic reaction -decomposition of calcium carbonate into calcium oxide and carbon dioxide (c)the reaction written in answer (b) also shows change in colour

Explanation:

(c) both lead nitrate and potassium iodide are colourless but when they are mixed give a yellow ppt solution