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SAI International School
Subject – Chemistry
Class – X
Competency Based Worksheet
CHAPTER-3 [ METALS AND NON-METALS]
1. a) No reaction takes place when granules of a solid ‘A’ are mixed with a
powder of solid ‘B’. However, when the mixture is heated, a reaction starts with
evolution of much heat. Product ‘C’ of the reaction settles down as a liquid
metal and solid product ‘D’ keeps floating over the liquid ‘C’. This reaction is
sometimes used for making metals for ready use in odd places.
(i) Based on this information, make assumptions about ‘A’ and ‘B’ and
corresponding deductions about ‘C’ and ‘D’ and write a balanced chemical
equation for the reaction. Include in the chemical equation about physical states
of the reactants and products, need of heating for starting the reaction and the
reaction being exothermic.
(ii) Name two types of chemical reactions to which this reaction can belong.
b) An ore on heating in air produces sulphur dioxide. Which process would you
suggest for its concentration? Describe briefly any two steps involved in the conversion
of this concentrated ore into related metal.
2.
