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Hydrogen

Question
CBSEENCH11006951
Wired Faculty App

How will you prepare a sample of temporary hard water from lime water? Write equation for the reactions involved.

Solution

Temporary hard water can be obtained by passing carbon dioxide in excess through lime water when calcium carbonate is first formed. It changes to soluble calcium bicarbonate by passing more carbon dioxide which imparts temporary hardness to water. 
  CO subscript 2 space plus space stack Ca left parenthesis OH right parenthesis subscript 2 with Lime space water below space space rightwards arrow space space space space space space stack CaCO subscript 3 with Calcium space carbonate below space plus space straight H subscript 2 straight O CaCO subscript 3 space plus space CO subscript 2 space plus space straight H subscript 2 straight O space space rightwards arrow space space space stack Ca left parenthesis HCO subscript 3 right parenthesis subscript 2 with Calcium space bicarbonate below

Some More Questions From Hydrogen Chapter

Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions?

Give one example in which hydrogen acts as an oxidising agent.

Give laboratory Preparation of Dihydrogen ?

Name the substances in which hydrogen exhibits 0 and -1 oxidation states.

Name one isotope of hydrogen which has no neutron.

Which isotope of hydrogen is used as a tracer in organic reactions ?

Hydrogen is the lightest gas. Still its use in filling balloons has been discarded. Why?

Hydrogen forms both H+ ion and H- ion. Explain.

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