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JEE Mains · Chemistry · STD 11 - 1. Some basic concept of chemistry

एक पदार्थ ' \(x\) ' के \(10 g\) में \(6.023 \times 10^{22}\) अणु उपस्थित हैं। तो उस विलयन की मोलरता, जिसके \(2 L\) विलयन में पदार्थ ' \(x\) ' का \(5 g\) है, होगी ...................... \(\times 10^{-3}\)

  1. A \(20\)
  2. B \(25\)
  3. C \(22\)
  4. D \(18\)
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Answer & Solution

Correct Answer

(B) \(25\)

Step-by-step Solution

Detailed explanation

moles \(=\frac{\text { number of molecules }}{6 \times 10^{23}}=\frac{\text { given mass }}{\text { molar mass }}\) \(\Rightarrow\) molar mas \(=\frac{10 \times 6.023 \times 10^{23}}{6.023 \times 10^{22}}=100 g / mol\) \(\Rightarrow\) molarity…
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