7 Long Answer Questions:
1. Identify the reactants and products in the following chemical reactions,
(a) Mixing of lead acetate solution and potassium iodide solution
(b) Mixing of ferrous sulphate solution and sodium hydroxide solution
(c) Heating of limestone
(d) Heating of nitrogen with oxygen to a temperature of about 3000 °C
(e) Reaction of zinc with sodium hydroxide
Chemistry
Answers
Answer:
a) Lead acetate dissolves in water to give lead ion and acetate ion and on reacting with potassium iodide, the lead ion joins with the iodine ion to form lead iodide and potassium ion joins with acetate ion to form potassium acetate. > Thus, lead acetate can be used in place of lead nitrate in this reaction.
b) An aqueous solution of ferrous sulphate reacts with aqueous solution of sodium hydroxide to form a precipitate of ferrous hydroxide and sodium sulphate remains in the solution.
c) When limestone is heated strongly, the calcium carbonate it contains absorbs heat (endothermic ) and decomposes to form calcium oxide. This is indicated by an orange glow as the limestone is heated.
d) Nitrogen Monoxide is formed when nitrogen and oxygen is mixed at 3000 degree Celsius.
e) ZN (s) + NaOH which gives sodium zincate, together with hydrogen gas. The compound sodium zincate, together with hydrogen gas, is formed when zinc reacts with excess sodium hydroxide. ... Since zinc is amphoteric, it interacts with the evolution of hydrogen gas to form sodium zincate with NaOH
Explanation:
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Answer:
7]1.a) potassium iodine solution+lead acetate solutions = precipitate of lead iodine(yellow)
b) ferrous sulphate (green)+ sodium hydroxide= ferrous hydroxide (dull green precipitate) + sodium sulphate
c) calcium carbonate (limestone) = calcium oxide+ carbon dioxide
d) nitrogen + oxygen = nitric oxide
e) zinc + sodium hydroxide = sodium zincate + hydrogen
Explanation:
a) potassium iodine solution and lead acetate solution are the reactance and precipitate of lead iodine is the product
b) ferrous sulphate and sodium hydroxide are the reactants and ferrous hydroxide and sodium sulphate are the products
c) calcium carbonate is the reactant and calcium oxide and carbon dioxide are the products
d) nitrogen and oxygen are the reactants and nitric oxide is the product
e) zinc and sodium hydroxide are the reactants and sodium zincate and hydrogen are the products