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Element (A) burns in nitrogen to give an...

Element (A) burns in nitrogen to give an ionic compound, `(B)` reacts with water to give (C) and (D). A solution of (C) becomes milky on bubbling carbon dioxide. Idendity (A),(B),(C) and (D)

A

Li

B

Mg

C

ca

D

Be

Text Solution

Verified by Experts

The correct Answer is:
c
Carbon dioxide turns only lime water milky. Thus , the compound C must be `Ca(OH)_(2)` and the element A must be Ca. the reactions are as follows:
`3Ca+N_(2)rarrCa_(3)N_(2)`
`Ca_(3)N_(2)+6H_(2)Orarr3Ca(OH)_(2)+2NH_(3)`
`Ca(OH)_(2)+CO_(2)rarrCaCO_(3)+H_(2)O`
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