\(\mathrm{MgCl}_2\) का \(80\) मोल प्रतिशत जलीय विलयन में वियोजित है। \(38^{\circ} \mathrm{C}\) पर \(1.0\) मोलल \(\mathrm{MgCl}_2\) जलीय विलयन का वाष्प दाब_________\(\mathrm{mm} \mathrm{Hg}\) है। (निकटतम पूर्णांक में) दिया: \(38^{\circ} \mathrm{C}\) पर जल का वाष्प \(\mathrm{Hg}\) है।

A \(47\)
B \(48\)
C \(46\)
D \(45\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(48\)

Step-by-step Solution

Detailed explanation

\(MgCl _2 \rightarrow Mg ^{+2}+2 Cl ^{-}\) \(1-\alpha \quad \alpha \quad 2 \alpha\) \(i =1+2 \alpha(\alpha=0.8)\) \(i =2.6\) \(\frac{\Delta p }{ p ^{\circ}}=\frac{ i \times n _2}{ n _1}\) \(\Delta p =2.34\) \(p _s=47.66\) \(p _{ s } \cong 48\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

सूची\(-I\) का मिलान सूची\(-II\) से कीजिए।

	सूची\(-I\)		सूची\(-II\)
\((A)\)	\(Cd ( s )+2 Ni ( OH )_{3}( s ) \rightarrow CdO ( s )+2 Ni ( OH )_{2}( s )+ H _{2} O (l)\)	\((I)\)	प्राथमिक बैटरी
\((B)\)	\(Zn ( Hg )+ HgO ( s ) \rightarrow ZnO ( s )+ Hg (l)\)	\((II)\)	द्वितीयक बैटरी को विसर्जित करना
\((C)\)	\(2 PbSO _{4}( s )+2 H _{2} O (l) \rightarrow Pb ( s )+ PbO _{2}( s )+ 2 H _{2} SO _{4}( aq )\)	\((III)\)	ईधन सेल
\((D)\)	\(2 H _{2}( g )+ O _{2}( g ) \quad \rightarrow 2 H _{2} O (l)\)	\((IV)\)	द्वितीयक बैटरी को चार्ज करना

नीचे दिए विकल्पों में से सही उत्तर चुनिए।

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