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Hydrogen — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrogen5 Marks
Question
Arrange the following:
  1. During Clark's method, name the compound in which 'Mg' is precipated out?
  2. Give the formula of Zeolite used in ion exchange method to remove permanent hardness of water.
  3. Complete the following reaction:
$\text{BaO}_2.8\text{H}_2\text{O}(\text{s})+\text{H}_2\text{SO}_4(\text{aq})\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ }$
  1. $H_2O_2$ is miscible with water. Assign reason.
  2. Name the compound which can be used as a hair bleach, mild antiseptic in form of perhydrol, as a rocket propellant in concentrated solution.
✓

Answer

  1. $\text{Mg}(\text{OH})_2$
  2. $\text{NaAlSiO}_4$ (Sodium aluminium silicate)
  3. $\text{BaO}_2.8\text{H}_2\text{O}(\text{s})+\text{H}_2\text{SO}_4(\text{aq})\\\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ }\text{BaSO}_4(\text{S})+\text{H}_2\text{O}_2(\text{l})+8\text{H}_2\text{O}(\text{l})$
  4. $H_2O_2$ can from H-bonds with water.
$\therefore$ It is miscible with water.
  1. $H_2O_2$​​​​​​​ (Hydrogen peroxide) is used in hair bleach. Its dilute solution acts as antiseptic.
Its concentrated solution acts as rocket propellant.

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