UPSC General Studies Sample Paper General Studies Sample Paper-5

  • question_answer
    Which of the following mechanisms is not associated with chemical weathering?           

    A)  Solution                       

    B)  Abrasion       

    C)  Carbonation                 

    D)  Oxidation      

    Correct Answer: B

    Solution :

    [b] Abrasion occurs when some force causes two rocks to come together causing mechanical wearing or grinding of their surfaces. While solution refers to the dissolution of soluble particles and minerals from the rocks with the help of water in motion. Carbonation is the reaction of carbonate or bicarbonate ions with minerals. The process of carbonation is also known as solution wherein atmospheric \[(C{{O}_{2}})\] after mixing with water forms carbonic acid (\[({{H}_{2}}C{{O}_{3}})\]) which after reacting with carbonate rocks, say limestones forms calcium bicarbonate  which is easily dissolved in water. The chemical process of oxidation simply means a reaction of atmospheric oxygen to form oxides.

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