किसी पदार्थ के (1.6,g) को (200,g) जल में घोलने पर \(\Delta T_f=0.744,K\) मिला। यदि सामान्य मोलर द्रव्यमान \(80,g,mol^{-1}\) और \(K_f=1.86,K,kg,mol^{-1}\) है, तो (i) क्या होगा?
When (1.6,g) of a substance is dissolved in (200,g) water, \(\Delta T_f=0.744,K\) is obtained. If normal molar mass is \(80,g,mol^{-1}\) and \(K_f=1.86,K,kg,mol^{-1}\), what is (i)?
Correct answer and explanation
D. (4)
Concept
सामान्य मोल \(=\frac{1.6}{80}=0.02,mol\), और विलायक (0.2,kg), इसलिए \(m=0.1,m\)। / Normal moles \(=\frac{1.6}{80}=0.02,mol\), and solvent \(=0.2,kg\), so \(m=0.1,m\).
Why this answer is correct
सामान्य \(\Delta T_f=1.86\times0.1=0.186,K\)। / Normal \(\Delta T_f=1.86\times0.1=0.186,K\).
Exam Tip
\(i=\frac{0.744}{0.186}=4\), यानी प्रभावी कण चार गुना हैं। / \(i=\frac{0.744}{0.186}=4\), meaning effective particles are four times.
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