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

\({NaOH}\) દ્રાવણની ઘનતા \(1.2 \,{gcm}^{-3}\) છે. આ દ્રાવણની મોલારીટી \(....\,m\) છે. (નજીકના પૂર્ણાંકમાં) [ઉપયોગ: પરમાણ્વીય દળ:\(Na:23.0\,u {O}: 16.0 \,{u} \quad {H}: 1.0 \,{u}\), ઘનતા \({H}_{2} {O}: 1.0 \,{~g} \,{~cm}^{-3}\) ]

  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 \(=(1.2 \times 1000)\, {g}\) \(=1200\, {gm}\) Neglecting volume of \({NaOH}\) Mass of water \(=1000\, {gm}\) \(\Rightarrow\) Mass of \({NaOH}=(1200-1000)\, {gm}\) \(=200\, {gm}\) \(\Rightarrow\) Moles of…
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