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

\(KOH\) (aq.) का \(6.50\) मोलल विलयन का घनत्व \(1.89 g cm ^{-3}\) है। विलयन की मोलरता.........\(mol dm -3\) है। (निकटतम पूर्णांक में) [परमाणु द्रव्यमान : \(K : 39.0\, u ; \,\,O : 16.0\, u ;\,\, H : 1.0 \,u\) ]

  1. A \(3\)
  2. B \(4\)
  3. C \(9\)
  4. D \(7\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(9\)

Step-by-step Solution

Detailed explanation

\(6.5\) molal \(KOH =1000\, gm\) solvent has \(6.5\) moles \(KOH\) so wt of solute \(=6.5 \times 56\) \(=364\, gm\) wt of solution \(=1000+364=1364\) Volume of solution \(=\frac{1364}{1.89} m \ell\) Molarity…
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