Class VIII

When coal burns in air then
  1. Carbon dioxide is formed
  2. Sulphur dioxide is formed
  3. Carbon monoxide is formed
  4. hydrogen gas is formed
PCRA stands for
  1. Public Conservations Research Association
  2. Petroleum Conservation Research Association
  3. Public Council of Research Association
  4. Partial Counting of remaining Amendment
Water is a
  1. Natural substance
  2. Man made substance
  3. Both of these
  4. None of these
Purest form of carbon is
  1. Coal
  2. charcoal
  3. Coke
  4. All of these
Coaltar contains about
  1. 300 substance
  2. 400 substance
  3. 200 substance
  4. 100 substance
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