Page 2 - 2. HA (Practice WS-8)
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(e) If Assertion & Reason both are incorrect.


                Q.4. Assertion : Carbon reacts with oxygen to form carbon dioxide which is an acidic
                oxide.
                Reason : Non-metals form acidic oxides.                                           [  U+Av ] (1mark)

                Q5. Unwanted material with ore  is  called as___________.             [  R+E ] (1mark)

               Q.6. .   Give reasons for the following:            [  A+Av ] (3mark)     [CBSE 2013, 2014]
                a.   Sodium, potassium and lithium are stored under
                   kerosene oil.
                b.   Aluminium is highly reactive metal but still used
                   for making cooking utensils.
                c.   Carbonate and sulphide ores are usually converted
                   into oxides during the process of extraction.

               Subjective-
                Q.7. A compound Z is formed by transfer of electrons from the metal X to a non-metal
                Y, Identify the type of bond formed in the compound. List three properties of compound
                formed by such type of bonds.                            [  A+Av ] (3mark)  [CBSE 2014]

               Q.8 . A metal forms an oxide having formula M2O3. It dissolves both in dilute sulphuric
               acid as well as dilute sodium hydroxide solution. Identify the metal and write the
               equations for the reactions involved.            [  A+D ] (3mark)             [CBSE 2015]

                Q.9. Name the ore of mercury. How mercury is extracted from its ore? [  U+Av ]
               (3mark) [CBSE 2013]
               Q10.a.Write the steps involved in the extraction of pure metals in the middle of the
               activity series from their carbonate ores.
               b.How is copper extracted from its sulphide ore? Explain the various steps supported by
               chemical equations.  Draw  a  labelled  diagram  for  the electrolytic refining of copper
                                     [  A+Av ] (5mark)   [CBSE 2016]




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