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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2010

  • question_answer
    Borax is used as a cleansing agent because on dissolving in water, it gives

    A)  alkaline solution

    B)         acidic solution

    C)         bleaching solution

    D)         amphoteric solution

    Correct Answer: A

    Solution :

    The aqueous solution of borax is alkaline due to hydrolysis and used as a cleansing agent. \[\underset{(borax)}{\mathop{N{{a}_{2}}{{B}_{4}}{{O}_{7}}}}\,+2{{H}_{2}}O\xrightarrow{{}}\underset{(strong\,\,alkali)}{\mathop{2NaOH}}\,+\underset{(weak\,\,acid)}{\mathop{{{H}_{2}}{{B}_{4}}{{O}_{7}}}}\,\]


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