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NEET Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ NEET PYQ-Some Basic Concepts Chemistry

  • question_answer
    How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?                     [AIPMT (S) 2008]

    A)  0.044     

    B)  0.333  

    C)  0.011         

    D)  0.029

    Correct Answer: D

    Solution :

    Key Idea: The reagent which is present in smaller quantity is called the limiting reagent and the moles of product depends on it and
    \[\text{number}\,\text{of}\,\text{moles}\,\text{=}\frac{\text{weight}}{\text{molecular}\,\text{weight}}\]
    \[\begin{matrix}    PbO & + & 2HCl\xrightarrow[{}]{{}} & PbC{{l}_{2}} & + & {{H}_{2}}O  \\    207.2+16 & {} & 2(35.5+1) & 207.2+71 & {} & {}  \\    =223.2 & {} & =73 & =278.2 & {} & {}  \\ \end{matrix}\]Here, 1 mole of PbO reacts with 2 moles of HCl, thus PbO is the limiting reagent
    \[\because \]       223.2 g PbO gives \[PbC{{l}_{2}}=278.2g\]
    \[\therefore \]      6.5 g PbO will give \[PbC{{l}_{2}}\]
    \[=\frac{278.2}{223.2}\times 6.5g\]
    \[=\frac{278.2\times 6.5}{223.2\times 278.2}mol\]
    \[=0.029\,mol\]


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