NEET Sample Paper NEET Sample Test Paper-51

  • question_answer How many moles of HCl must be removed from 1 litre of aqueous HCl solution to change its pH from 2 to 3-

    A) 1                     

    B) 0.02

    C) 0.009               

    D) 0.01

    Correct Answer: C

    Solution :

    \[\Delta N={{10}^{-}}^{2}-{{10}^{-}}^{3}\] \[={{10}^{-}}^{2}\left( 1-0.1 \right)\] \[=\text{ }9\,\,\times \,\,{{10}^{-}}^{3}\] \[\therefore \,\,\,\Delta \,M=\text{ }9\,\,\times \,\,{{10}^{-}}^{3}\] \[\therefore \,\,\,\Delta \,moles=\text{ }9\,\,\times \,\,{{10}^{-}}^{3}\]

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