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NEET Sample Paper NEET Sample Test Paper-93

  • question_answer
    Heat is required to change 1 kg of ice of\[-20{}^\circ C\] into steam. \[{{Q}_{1}}\] is the heat needed to warm the ice from \[-20{}^\circ C\] to \[0{}^\circ C,\]\[{{Q}_{2}}\] is the heat needed to melt the ice, \[{{Q}_{3}}\] is the heat needed to warm the water from \[0{}^\circ C\] to \[100{}^\circ C\] and\[{{Q}_{4}}\] is the heat needed to vaporize the water. Then

    A) \[{{Q}_{4}}>{{Q}_{3}}>{{Q}_{2}}>{{Q}_{1}}\]

    B) \[{{Q}_{4}}>{{Q}_{3}}>{{Q}_{1}}>{{Q}_{2}}\]

    C) \[{{Q}_{4}}>{{Q}_{2}}>{{Q}_{3}}>{{Q}_{1}}\]

    D) \[{{Q}_{4}}>{{Q}_{2}}>{{Q}_{1}}>{{Q}_{3}}\]

    Correct Answer: A

    Solution :

    [a] \[{{Q}_{4}}=m{{L}_{w}}=540\,cal\] \[{{Q}_{3}}=m{{s}_{w}}(100-0)=100\,cal\] \[{{Q}_{2}}=m{{L}_{ice}}=80\,cal\] \[{{Q}_{1}}=m{{s}_{ice}}=(20-0)=20\,cal\] \[{{Q}_{4}}>{{Q}_{3}}>{{Q}_{2}}>{{Q}_{1}}\]


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