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39 Which statement about petroleum fractions is correct? A All petroleum fractions are used as fuels. B Gas oil is used to make bottled gas for heating. C Hydrocarbons in diesel have higher boiling points than hydrocarbons in gasoline. D ...
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38 P, Q, R and S are four organic compounds. P is an unsaturated hydrocarbon. Q burns but otherwise is unreactive. R contains a C–C single bond and a C=C double bond. S undergoes addition polymerisation. Which compounds are alkenes? A P ...
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33 Some information about compound L is listed. 1 L is an organic compound which contains four hydrogen atoms. 2 L is soluble in water. 3 An aqueous solution of L reacts with copper(II) carbonate to produce a gas. What ...
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32 A white solid Z reacts with dilute hydrochloric acid to produce a gas. The same gas is produced when compound Z is heated strongly. What is Z? A calcium B calcium carbonate C calcium hydroxide D calcium oxide
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31 Which row describes the uses of sulfur and sulfur dioxide? sulfur   sulfur dioxide A extraction of aluminium   food preservative B extraction of aluminium   manufacture of cement C manufacture of sulfuric acid   food preservative
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30 A student writes three statements about potassium nitrate, KNO3. 1 The relative formula mass of KNO3 is 101. 2 Potassium nitrate contains the three essential elements for plant growth. 3 Potassium nitrate could be used as a fertiliser. Which statements are ...
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28 Ammonium chloride is heated with aqueous sodium hydroxide. ammonium chloride and aqueous sodium hydroxide damp universal indicator paper gentle heat A gas is produced which turns damp universal indicator paper blue. Which gas ...
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