Give a test that can be used to confirm the presence of carbon in a co

1.	Give a test that can be used to confirm the presence of carbon in a compound. Write its three allotropes.
Answer» (i) Presence of carbon can be detected by heating the compound with cupric oxide (Cuo) strongly, when carbon is oxidised to carbon dioxide (CO₂), which can be tested by lime water test. C + 2CuO ⇾ CO₂ + 2Cu (In the compound) CO₂+ Ca(OH)₂(Milky)⇾ CaCO₃+H₂O (ii) Also, as an another test, when saturated hydrocarbons are heated, they give a clean flame, while unsaturated hydrocarbons will give a yellow flame with lots of black smoke. This results in a sooty deposit on the metal plate. Three allotropes of carbon: (i) Graphite (ii) Diamond (iii) Fullerenes

Give a test that can be used to confirm the presence of carbon in a compound. Write its three allotropes.

Answer»

(i) Presence of carbon can be detected by heating the compound with cupric oxide (Cuo) strongly, when carbon is oxidised to carbon dioxide (CO₂), which can be tested by lime water test.

C + 2CuO ⇾ CO₂ + 2Cu (In the compound)

CO₂+ Ca(OH)₂(Milky)⇾ CaCO₃+H₂O

(ii) Also, as an another test, when saturated hydrocarbons are heated, they give a clean flame, while unsaturated hydrocarbons will give a yellow flame with lots of black smoke. This results in a sooty deposit on the metal plate.

Three allotropes of carbon:

(i) Graphite

(ii) Diamond

(iii) Fullerenes

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