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Class 12th chemistry questions

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THE ZONE OF CHEMISTRY (MOLEFRACTION) DPP
1.What is the mole fraction of िोल अंश क्रिशः x, 2x, और 1 − 3x हैं। x िा
component A in a mixture containing 2
moles of A and 3 moles of B? िान ज्ञात िीजिए।
7. Initially, a binary solution has a mole
यदि किसी मिश्रण िें A िे 2 िोल और B िे 3
fraction of A = 0.3. On adding more of
िोल हैं, तो A िा िोल अंश (Mole Fraction) component A, the mole fraction of A
क्या होगा? becomes 0.5. If initially the number of
2. A solution contains 46 g of ethanol moles of B was 7, find the moles of A
(C₂H₅OH) and 180 g of water (H₂O). aaadded.
Calculate the mole fraction of ethanol. प्रारं भ िें एि द्विघटि विलयन िें A िा िोल
एि विलयन िें 46 ग्राि एथेनॉल (C₂H₅OH) अंश 0.3 है। A िो और मिलाने पर िोल अंश
और 180 ग्राि पानी (H₂O) है। एथेनॉल िा िोल 0.5 हो िाता है। यदि प्रारं भ िें B िे िोल 7 थे,
अंश ज्ञात िीजिए। तो मिलाए गए A िे िोल ज्ञात िीजिए।
3. The mole fraction of a solute in a 8. A solution is made by mixing 18 g of
solution is 0.2. What is the mole fraction water (H₂O) and 46 g of ethanol
of the solvent? (C₂H₅OH). Calculate the mole fraction
यदि किसी विलयन िें विलेय िा िोल अंश 0.2 of ethanol.
है, तो विलायि िा िोल अंश क्या होगा? 18 ग्राि िल (H₂O) और 46 ग्राि एथेनॉल
a) 0.2 (C₂H₅OH) मिलािर एि विलयन बनाया गया।
b) 0.5 एथेनॉल िा िोल अंश ज्ञात िीजिए।
c) 0.8 9. A gas mixture contains 8 g of oxygen
d) 1.0 (O₂), 14 g of nitrogen (N₂), and 22 g of
4. Mole fraction has: carbon dioxide (CO₂). Find the mole
िोल अंश िी इिाई होती है : fraction of each gas.
a) No units एि गैसीय मिश्रण िें 8 ग्राि ऑक्सीिन (O₂),
b) Unit of mol
c) Unit of mol/L 14 ग्राि नाइट्रोिन (N₂), और 22 ग्राि िाबबन
d) Unit of L/mol डाइऑक्साइड (CO₂) हैं। प्रत्येि गैस िा िोल
5. A solution contains 5 moles of urea अंश ज्ञात िीजिए।
and 95 moles of water. Calculate the
mole fraction of urea. 10. In a solution containing 78 g of
एि विलयन िें 5 िोल यरू रया तथा 95 िोल benzene and 46 g of ethanol,
िल हैं। यूररया िा िोल अंश ज्ञात िीजिए। calculate the mole fraction of
5. A solution is prepared by dissolving benzene.
20 g of NaOH in 100 g of water.
यदि 78 ग्राि बेंिीन और 46 ग्राि एथेनॉल
Calculate the mole fraction of NaOH.
100 ग्राि िल िें 20 ग्राि NaOH घोलिर एि मिलािर विलयन बनाया िाए, तो बेंिीन िा

विलयन तैयार किया गया। NaOH िा िोल िोल अंश ज्ञात िीजिए।

अंश ज्ञात िीजिए।
6. A mixture contains 3 gases: A, B, and By:-
C with mole fractions x, 2x, and 1 - 3x
respectively. Find the value of x.
S.K.Shrivastav
एि मिश्रण िें 3 गैसें A, B, और C हैं, जिनिे MSc.(chem)
8538909073

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