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Question

Calcium Cyanamide - CaNCN, which is produced by the Nitrogen fixation reaction of heating CaC2 and N2 is black in colour – True or False?

A
True
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B
False
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Solution

The correct option is A True
Let us recall the cyanamide process:
CaC2+N2CaCN2+C
As you can see, there is some carbon produced as the product. This gives CaNCN a black colour. When hydrolyzed in soil, CaNCN yields ammonia. A simple version of the reaction may be understood as
CaCN2+3H2O2NH3+CaCO3
In some interpretations, another reaction is also considered:
CaCN2+4H2O
Ca(OH)2+CO2+2NH3

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