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

\(NaOH\) के एक विलयन का घनत्व \(1.2 \,g \,\,cm ^{-3}\) है। इस विलयन की मोललता.........................\(m\) है । (निकटतम पूर्णाक में) [उपयोग कीजिए : परमाणु संहतियाँ : \(Na : 23.0 \,u\) \(O : 16.0 \,u \,H : 1.0 u\) जल का घनत्व : \(1.0\, g\, cm ^{-3}\) ]

  1. A \(6\)
  2. B \(5\)
  3. C \(4\)
  4. D \(1\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(5\)

Step-by-step Solution

Detailed explanation

Consider \(1\, \ell\) solution mass of solution \(=(1.2 \times 1000)\, \mathrm{g}\) \(=1200\, \mathrm{gm}\) Neglecting volume of \(\mathrm{NaOH}\) Mass of water \(=1000\, \mathrm{gm}\) \(\Rightarrow\) Mass of \(\mathrm{NaOH}=(1200-1000)\, \mathrm{gm}\) \(=200\, \mathrm{gm}\)…
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