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The variety of coal in which the deposit contains recognisable traces of the original plant material is
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1) Which of the following metals remain in liquid for under normal conditions?
2) Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
3) The gases used in different types of welding would include
4) Which of the following is the lightest metal?
5) The most important ore of aluminium is