Question

write balanced chemical equation for the following statement (1) NaoH solution in heated with Zinc granules. (2) Excess of carbon dioxide gas in passed through lime water. (3) Dilute sulphuric acid reacts with sodium carbonate. (4) Egg shell are dropped in hydrochloric acid. (5) copper (2) oxide react with dilute hydrochloric acid​

Answer 1

Hello dear ,

_________

●(a) When sodium hydroxide solution is heated with zinc granules then sodium zincate and hydrogen gas are formed.

2NaOH (aq) + Zn (s) → Na2ZnO2(aq) + H2(g)

●(b)When carbon dioxide gas is passed through lime water, it turns milky or turbid due to the formation of calcium carbonate which is insoluble in water. Following is the chemical equation for the reaction

 Ca(OH)2 + CO2 → CaCO3 + H2O 

However, when excess of carbon dioxide is passed through the solution, the turbidity disappears and a clear solution is obtained due to the formation of calcium bicarbonate, which is soluble in water. Following is the chemical equation for the reaction

 CaCO3 + H2O + CO2 → Ca(HCO3)2  

●(c)Carbon dioxide gas is evolved.

H2SO4 + NaHCO3 --> NA2SO4 + H2O + CO2

●(d) The balanced reaction reaction scheme is expressed below,

2HCl + CaCO3 = CaCl2 + H2O + CO2

________

Hope it helps u !!