Question

What colour flame is seen when Anthracite coal is burnt?
A. Black
B. Green
C. Blue
D. Yellow

Answer 1

Hint: Anthracite has the highest carbon content and the least impurities. The carbon content determines the colour of the produced flame. The Alden Coal Company named the coal based on the colour.

Complete Answer: Anthracite, a hard, that has submetallic luster is also known as hard coal. While talking about its content, the carbon components are the highest and the impurities are very less. Anthracite is at the highest ranking of coals because of the highest energy density.
Anthracite is derived from the Greek word 'anthracite' which means coal-like. This coal is also known by several other terms like black coal, hard coal, dark coal, stone coal, blind coal, diamond coal, etc. When Anthracite is burned, because of its high carbon content, it produces a blue flame. The Glen Alden Coal Company in Pennsylvania, United States used the term "Blue Coal" for a once-popular brand of anthracite.
The actual cost of the Anthracite coal is two to three more than the regular coal. This coal is majorly used as a domestic fuel. It is used in hand stoves and automatic stoker furnaces.
In the United Kingdom's Clean Air Act of 1993, anthracite is an authorized fuel.
While talking about the other options,
A. and B. No coal produces a black or green flame when burned.
D. When Bituminous coal is burned, it produces a yellow flame.

Thus the correct option is C.

Note: As of now, China is the largest anthracite producer in the world. The produce of China is generally used for power generation, the output is of standard-grade anthracite.