Q1. Which of the following minerals is non-metallic and inorganic?
A Natural Gas
B Coal
C Petroleum
D Graphite Correct
Explanation
Graphite is treated as a non-metallic mineral and is inorganic in the usual mineral classification used for geography and resource studies. It is a crystalline form of carbon and is mined as a mineral. Natural gas, coal and petroleum are energy resources derived from organic matter over geological time. Natural gas is a fuel, coal is a fossil fuel, and petroleum is a liquid hydrocarbon resource. Because the question asks for a non-metallic and inorganic mineral, graphite is the choice that fits the printed key.