Practice Test 6
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Hard water when passed through ion exchange resin containing R’COOH groups, becomes free from :

  • Solution

    An ion exchange resin containing R–COOH group exchange cations like Ca2+, Mg2+, Na+ ,Fe2+ with H+ when hard water is passed through it.This resin is called cation exchange resin.

H2O2 ⟶ 2H+ + O2 + 2e–; E° = –0.68 V. This
equation represents which of the following behaviour of H2O2.

  • Solution

    As H2O2 is loosing electrons so it is acting as reducing agent.

Which of the following is wrong about H2O2? It is used

  • Solution

    H2O2 show all these properties.

H2O2 is always stored in black bottles because

  • Solution

    H2O2 is unstable liquid and decomposes into water and oxygen either on standing or on heating.

Hydrogen is not obtained when zinc reacts with

  • Solution

    Zinc has no action on cold water

H2O2 is a

  • Solution

    H2O2 ⟶ H2O + [O]

Which substance does not speed up decomposition of H2O2

  • Solution

    Glycerol, phosphoric acid or acetanilide is added to H2O2 to check its decomposition.

20 volume H2O2 solution has a strength of about

  • Solution

Which one the following removes temporary hardness of water ?

  • Solution

The strength in volumes of a solution containing 30.36 g/L of H2O2 is

  • Solution

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