UPSC NDA I 2018 General Ability Solved Paper

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Question : 85 of 150

Marks: +1, -0

How is carbon black obtained?

[NDA I 2018]

By heating wood at high temperature in absence of air
By heating coal at high temperature in absence of air
By burning hydrocarbons in a limited supply of air
By heating coal at high temperature in presence of air

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