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Answered on 12/12/2018 CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

Potassium carbonate cannot be prepared by Solvay process. Why?

Maruva J

Pottasium bicarbonate is soluble in water.It does not precipitate out..
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Answered on 06/12/2018 CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

GURUJOT SINGH

Quick lime is calcium oxide ...when it added to water it converts into slaked lime
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Answered on 14/12/2018 CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

Mona

Chemistry Tutor

Epsom salt is MgSO4 .
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Answered on 13/12/2018 CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

Ranjana C.

Alkali metals dissolve in liquid ammonia to give deep blue solutions that are conducting in nature.This happens because the alkali metal atom readily loses the valence electron in ammonia solution The ammoniated electron is responsible for the blue colour of the solution
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Answered on 22 Jan CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

What happens when sodium metal is heated in free supply of air?

Sunakshi Khanna

Catches fire
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Answered on 14 Jan CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

Why are alkali metals always univalent? Which alkali metal ion forms largest hydrated ion in aqueous solution? read more
Why are alkali metals always univalent? Which alkali metal ion forms largest hydrated ion in aqueous solution? read less

Abhay Krishna Pandey

Concepts from down to top..

Beryllium and magnesium do not give colour to flame
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Answered on 04 Feb CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

Why does the solution of alkali metals becomes blue in liquid ammonia? Give the chemical equation also. read more
Why does the solution of alkali metals becomes blue in liquid ammonia? Give the chemical equation also. read less

Ayush Kumar Jha

The blue colour is due to the presence of ammoniated electrons which absorb energy in the visible region of light. The associated chemical reaction is:- M + (x+y)NH3 -> M^+(NH3)x + ^-
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Answered on 08/12/2018 CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

Prashanth

School and College Topper. Studied in IIT and NIT.

Because they are unstable and they react very fast to other elements but they can found in combined state.
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Answered on 13/12/2018 CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

Navneet Jhariya

It is as similar tohydrogen peroxide both hydrogens are replaced by metal.Hence the oxidation state will be as other metal possess of first group i.e. +1 .So here also Na+1 will exist both the Na will have +1 and +1.Thus overall compound will be neutral.Each oxygen will be existing in -1 oxidation state.... read more

It is as similar tohydrogen peroxide both hydrogens are replaced by metal.Hence the oxidation state will be as other metal possess of first group i.e. +1 .So here also Na+1 will exist both the Na will have +1 and +1.Thus overall compound will be neutral.Each oxygen  will be existing in -1 oxidation state. 

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Answered on 30 Jan CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone?

Dr. Hefjur Rahman

Study hard ,Party harder

LiF contains Lithium and Fluride ion ,On other side LiCl contain Chloride ion.According to Fajan's law, Covalency is proportional to polarisability of anion & polarisability is proportional to size of anion.So, LiCl is more covalent ,So it's insoluble in both. acetone and water.
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