Some important Compounds

Question 1

in the electrolysis of brine(conc.NaCl)
what reaction takes place at cathode
and anode respectively

Answer 1

H2O + e- –>H2 + OH-
Cl- –>Cl2 + e-

Question 2

in Castner Kellner cell
what reactions takes place

Answer 2

e- + Na+ —>Na-Hg
Cl- —>Cl2 + e-
Na-Hg + H2O—>NaOH + H2 + Hg

Question 3

i)NaOH + Cl2
ii)NaOH + F2
iii)NaOH + P4
iv)NaOH + S8

Answer 3

i)NaOH + Cl2–>NaCl+ NaOCl
ii)NaOH + F2–>NaF + HF + O2
iii)NaOH + P4–>PH3 + NaH2PO2
iv)NaOH + S8–>Na2S + Na2S2O3

Question 4

Reactions in Solvay Process

Answer 4

i)NH3 + CO2 + H2O—>(NH4)2CO3
ii)(NH4)2CO3 + CO2 + H2O–>(NH4)HCO3
iii)(NH4)HCO3 + NaCl–>NaHCO3+NH4Cl
iv)NaHCO3–heat–>Na2CO3+CO2+H2O

Question 5

1)washing soda–efflorosence–>A-373K->B
2)Baking Soda

Answer 5

1)Na2CO3.10H2O–efflorosence>Na2CO3.H2O
Na2CO3.H2O–373K–>Na2CO3
2)NaHCO3