Read the following passage and answer the questions that follow : In the given diagram, when electricity is…
Read the following passage and answer the questions that follow :
In the given diagram, when electricity is passed through an aqueous solution of a common salt, a substance 'Z' is produced, along with the evolution of gases 'X' and 'Y'. When a burning matchstick is brought near the gas 'Y', it burns with a pop sound, whereas 'X' is used for disinfecting drinking water. When 'X' is passed through slaked lime, an insoluble substance 'A' is produced.
(a) Write the names of the gases 'X' and 'Y'.
(b) Write the balanced chemical equation for the formation of substance 'Z'.
(c) (i) What happens :
(I) If a drop of red litmus solution is added to the aqueous solution of substance 'Z' ?
(II) If CO2 gas is passed through ammoniacal solution of aqueous NaCl ?
Solution
(a) X - Chlorine gas
Y -Hydrogen gas
(b)
(Deduct ½ marks for no/incorrect balancing)
(c) (i)
(I) The red litmus solution will turn blue.
(II) Sodium hydrogen carbonate and Ammonium chloride will
be formed / NaHCO3 and NH4Cl will be formed. /
PAGE 6 {31/2/1}
OR
(c) (ii)
• Bleaching Powder / CaOCl2 / Ca(ClO)2
• Ca(OH)2 + Cl2 → CaOCl2 + H2O /
2Ca(OH)2+2Cl2 →Ca(ClO)2+CaCl2+H2O
(Deduct ½ mark for no/incorrect balancing)
