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1) When iron and sulphur are mixed together at room temperature there is lack of a. reaction b. production of new product c. mixed reaction d. both a and b
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2) Due to temperature sensitivity the element which is filled in thermometer, is a. mercury b. copper c. helium d. oxygen
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3) Heating, exposing to light or passing electricity will only let to decompose a. element b. compound c. mixture d. liquid
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4) A substance which cannot be broken into further simpler substance by any chemical reaction is called a. element b. compound c. mixture d. solution
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5) Nitric acid is combined with oxygen to produce brown fume of a. nitrogen oxide b. nitrogen dioxide c. carbon dioxide d. nitrogen
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6) A process by which new substance is formed, is called a. chemical symbol b. chemical formula c. chemical property d. chemical reaction
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7) A molecule which breaks and gives of hydrogen and oxygen is a. water b. carbon dioxide c. air d. sodium chloride
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8) When magnesium element is burnt with oxygen it makes a compound called a. magnesium peroxide b. magnesium oxide c. magnesium carbonate d. magnesia
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9) Salt, sugar, chalk and sand are all a. elements b. compounds c. mixtures d. solutions
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10) The gas which is used as cooling agent is a. carbon dioxide b. helium c. argon d. nitrogen
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