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MCQ 11: When iron and sulphur are mixed together at room temperature there is lack of:

  1. reaction
  2. production of new product
  3. mixed reaction
  4. both a and b

MCQ 12: Due to temperature sensitivity the element which is filled in thermometer, is:

  1. mercury
  2. copper
  3. helium
  4. oxygen

MCQ 13: Heating, exposing to light or passing electricity will only let to decompose:

  1. element
  2. compound
  3. mixture
  4. liquid

MCQ 14: A substance which cannot be broken into further simpler substance by any chemical reaction is called:

  1. element
  2. compound
  3. mixture
  4. solution

MCQ 15: Nitric acid is combined with oxygen to produce brown fume of:

  1. nitrogen oxide
  2. nitrogen dioxide
  3. carbon dioxide
  4. nitrogen

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