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When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to ______. - Chemistry

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प्रश्न

When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to ______.

विकल्प

  • ammoniated electron

  • sodium ion

  • sodium amide

  • ammoniated sodium ion

MCQ
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उत्तर

When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to ammoniated electron.

Explanation:

The alkali metals dissolve in liquid ammonia and give a blue solution, which is conductive in nature. A solution of sodium in liquid ammonia at − 30°C conducts electricity. The ammoniated electrons are responsible for the blue color of the solution as they absorb energy in the visible region of light and impart blue color to the solution.

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Group 2 Elements - Alkaline Earth Metals
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 10: The s-block Elements - Multiple Choice Questions (Type - I) [पृष्ठ १२७]

APPEARS IN

एनसीईआरटी एक्झांप्लर Chemistry [English] Class 11
अध्याय 10 The s-block Elements
Multiple Choice Questions (Type - I) | Q 12 | पृष्ठ १२७

संबंधित प्रश्न

Discuss the general characteristics and gradation in properties of alkaline earth metals.


Assertion: BeSO4 is soluble in water while BaSO4 is not

Reason: Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.


Discuss briefly the similarities between beryllium and aluminium.


Beryllium halides are covalent whereas magnesium halides are ionic why?


Why alkaline earth metals are harder than alkali metals?


Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is ______.


Identify the correct formula of halides of alkaline earth metals from the following.

(i) BaCl2.2H2O

(ii) BaCl2.4H2O

(iii) CaCl2.6H2O

(iv) SrCl2.4H2O


Discuss the trend of the following:

The solubility and the nature of oxides of Group 2 elements.


Why are BeSO4 and MgSO4 readily soluble in water while CaSO4, SrSO4 and BaSO4 are insoluble?


Assertion (A): Beryllium carbonate is kept in the atmosphere of carbon dioxide.

Reason (R): Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.


An element of group 2 forms covalent oxide which is amphoteric in nature and dissolves in water to give an amphoteric hydroxide. Identify the element and write chemical reactions of the hydroxide of the element with an alkali and an acid.


Alkaline earth metals show ______. 


Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is ______.


Given below are two statements:

Statement I: Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.

Statement II: Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.

In the light of the above statements, choose the most appropriate answer from the options given below.


PbCl4 exists but PbBr4 and Pbl4 do not because of ______.


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