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SAI International School

                                                         Class-X
                                                 Subject_ Chemistry
                                          Ch- Carbon & it's Compounds
                Ch-1(Full) , Ch- 2(Full) , Ch-3(Full) & Ch-4 (covering module_34 to 36)

                                                     Worksheet: 12
               Objective-

               Q1.Translate the following reaction into balanced chemical equations:
               Manganese dioxide is heated with aluminium powder.  [  A+Av ] (1mark)


                Q2. A white salt of lead on heatingdecomposes to give brown fumes and a residue is
                left behind.Name the salt.[  R+E ] (1mark)


               Q3.Acid + Metal-oxide —> ?[U+Av ] (1mark)

               Q4.Ethane, with the molecular formula C2H6 has:                 [  A+Av ] (1mark)
               (a) 6 covalent bonds
               (b) 7 covalent bonds
               (c) 8 covalent bonds
               (d) 9 covalent bonds

               .
               Q5.While cooking, if the bottom of the vessel is blackened on the outside, it means that
               (a) the food is not cooked completely                   [ U+Av ] (1mark)
               (b) the fuel is not burning completely
               (c) the fuel is wet
               (d) the fuel is burning completely.

               Subjective-


               Q.6.(a)Give a chemical test to distinguish between saturated and unsaturated
                hydrocarbons.
               (b) (i) Name the products formed when ethanol burns in air. ‘
               (ii) What two forms of energy are liberated on burning alcohol?
               (c) Why is the reaction between methane and chlorine considered a substitution
               reaction?[ A+Av ] (3mark)


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