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Answers
1.Calcium hydroxide, also called slaked lime, Ca(OH)2, is obtained by the action of water on calcium oxide. When mixed with water, a small proportion of it dissolves, forming a solution known as limewater, the rest remaining as a suspension called milk of lime.
Reaction : CaCl2 + 2NaOH → Ca(OH)2 + 2NaCl
2.Water can not be decomposed by physical means. Water can be decomposed by a method known as 'electrolysis of acidified water where, dilute acid is added to water, to increase the number of ions and an electrical current is passed though it. The hydrogen gas is collected at the cathode and the oxygen ions are collected at the anode.
Reaction: 2H2O → 2H2↑ + O2↑
3.Pb(NO3)2 + 2 NaCl(aq) → PbCl2(s) + NaNO3(aq)
4.The law of conservation of mass states that matter can neither be created nor can be destroyed during the course of a chemical reaction.
5.The action of one chemical compound on the other one, is known as a chemical reaction. The two components of a chemical reaction are its reactants and the products.
Answer:
1.) Slaked lime is
a soft, white, crystalline, very slightly water-soluble powder.
Ex- calcium oxide ( Ca(OH)2 )
Explanation:
The formation of slaked lime (calcium hydroxide, Ca(OH)2) when water is added to lime (CaO) is exothermic:
CaO(s) + H2O (l) → Ca(OH)2(s)