sblock Elements - Result Question 45

####55. Element A burns in nitrogen to give an ionic compound B. Compound B reacts with water to give C and D. A solution of C becomes ‘milky’ on bubbling carbon dioxide gas. Identify A,B,C and D.

(1997, 3M)

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Solution:

  1. 3M+N2M3N2

M3N2+6H2O3M(OH)2C+2NH3D

M(OH)2C+CO2MCO3 Milkyness 

M can be either Ca or Ba but essentially not Mg because Mg(OH)2 is very sparingly soluble in water.



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