When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water, the sodium ions are exchanged withA. `Ca^(2+) or Mg^(2+)` ions in zeolite are replaced by `Na^(+)` ions in hard water.B. Ca^(2+)` ions in zeolite are replaced by `Mg^(2+)` ions in hard water.C. `Na^(+)` ions in zeloite are replaced by `Ca^(2+)` and `Mg^(2+)` ions in hard water.D. None is correct.

When zeolite, which is hydrated sodium aluminium silicate, is treated

1.	When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water, the sodium ions are exchanged withA. `Ca^(2+) or Mg^(2+)` ions in zeolite are replaced by `Na^(+)` ions in hard water.B. Ca^(2+)` ions in zeolite are replaced by `Mg^(2+)` ions in hard water.C. `Na^(+)` ions in zeloite are replaced by `Ca^(2+)` and `Mg^(2+)` ions in hard water.D. None is correct.
Answer» Correct Answer - C It is the correct answer, `Ca^(2+) and Mg^(2+)` ions which make water hard are replaced by `Na^(+)` ions of zeolite,