फुलरीन कार्बन अपररूपों का रासायनिक सूत्र निम्नलिखित में से कौन सा है?

Which unique property of carbon allows it to form a very large number of stable compounds by bonding covalently with other carbon atoms?

When burnt in air, unsaturated hydrocarbons usually produce a:

What does a blue, non-luminous flame indicate when a hydrocarbon fuel is burnt?