Sodium Carbonate cannot be used in place of $(NH_4)_2CO_3$ for the identification of $Ca^{2+},\, Ba^{2+}$ and $Sr^{2+}$ ions (in group V) during mixture analysis because :

$Mg^{2+}$ ions will also be precipitated.

Sodium Carbonate cannot be used in place of $(NH_4)_2CO_3$ for the identification of $Ca^{2+},\, Ba^{2+}$ and $Sr^{2+}$ ions (in group V) during mixture analysis because :}

$Mg^{2+}$ ions will also be precipitated.

Concentration of $CO_3^{2-}$ ions is very low.

Sodium ions will react with add radicals.

Na+ions will interfere with the detection of $Ca^{2+},\, Ba^{2+},\, Si^{2+}$ ions.

Sodium Carbonate cannot be used in place of $(NH

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Allotropes of Carbon

The existence of a chemical element in one or more physical forms happening in the same physical state is called Allotropes or allotropy. Allotropes may show different physical or chemical states turning on the atom arrangement or the number of existent atoms. While carbon and sulfur is the common element presenting allotropy. Carbon can make further allotropes due to its five-membered valency.

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Allotropes of Carbon:

Carbon is part of a p-block element.

The atomic number of carbon = 6
It belongs to group 14.
It makes up about 18.5% of the human body by mass.

Carbon has only two types of allotropes, such as;

Crystalline
Amorphous

The crystalline form of carbon consists of allotropes like;

Diamond
Graphite
Fullerenes

The amorphous form of carbon consists of allotropes like;

Coal
Coke
Wood charcoal
Animal charcoal
Lampblack
Gas carbon