JAC 12th Chemistry Important Questions Chapter-2

JAC 12th Chemistry Important Questions For Board Exam: झारखण्ड बोर्ड कक्षा 12th सभी विद्यार्थियों के लिए Chemistry Chapter 2. Solutions पिछले वर्षो में जो भी प्रश्न पूछे गए हैं, उनकी चर्चा हम इसमें करेंगे इनमें हम Subjective Questions तथा Objective Questions को देखेंगे तो इन Important Questions को पढ़ लीजिए.

रांची: झारखंड एकेडमिक काउंसिल ( JAC Board) कक्षा JAC 12th Chemistry Important Question के पिछले वर्षों के सभी महत्वपूर्ण प्रश्न (important Questions) आपको यहाँ पर बताए जा रहे है, जो बोर्ड परीक्षा के लिए बहुत महत्वपूर्ण है. अगर आप इन सभी प्रश्नों को याद कर लेते हो तो अवश्य ही आप JAC Board class 12th Chemistry exam में अच्छे अंक प्राप्त कर सकते हो.यदि आप ऐसे ही सभी विषयों के Chapterwise प्रश्न उत्तर चाहते हैं तो हमारे वेबसाइट jharkhandlab.com से जुड़े रहे.

विद्यार्थी इसका उत्तर स्वयं करें। ये सारे प्रश्न आपके परीक्षा (JAC 12th Chemistry Important Question For Board Exams)में बार – बार पूछे जा रहे है। इसमें आपको सभी chapter का अलग-अलग पिछले 16 से 17 वर्षों के महत्वपूर्ण प्रश्न मिलेंगे। यानि 2006-2022 इसमें आपको ये भी बताया जा रहा है कि कौन से प्रश्न किस तरह से एवं कितने marks के पूछे  जा रहें है।

यदि वैसे छात्र छात्राएं जो प्रश्नों के उत्तर नहीं कर पाते हैं, वो कुछ दिन प्रतीक्षा करें. आप यहाँ से Questions-answers डाउनलोड कर सकते हैं.

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• JAC 12th English Core Important Questions Chapter 3. Keeping Quiet
• JAC 12th Physics Important Questions Ch.1. Electric Charges and fields
• JAC 12th Chemistrty Important Questions Ch.1. Solid State

JAC 12th Chemistry Important Questions

JAC 12th Chemistry Previous Years Important Questions

Q1. Define molarity and molality? (2006, 2011, 2015, 2017)
Q2. Define colligative properties of dilute solution. Write down different types of colligative properties. (2006, 2012)
Q3. State Roult’s law for solution of non volatile dilute. (2007)
Q4. A solution of 12.5 g urea India 170g of water gave a boiling point elevation of 0.63K. Calculate molecular weight of urea taking Kb= 0.52 K/m. (2007)

Q5. Calculate the normality of 0.2(M) aqueous solution of a dibasic acid. (2008)
Q6. At 298 K , the vapour pressure of water is 23.75mm of Hg. Calculate the vapour pressure at the same temperature over 5% aqueous solution of urea(2008)

Q7. What will be they Van’t Hoff factor for dilute aqueous solution of BaCl2. (2009)
Q8. A solution containing 2.56 gram of sulphur dissolved in 100 gram of naphthalene has melting point is 80.1°C. Give a freezing point lowering by 0.68°C. Calculate the molecular formula of sulphur. (Kf for naphthalene =6.8K/m) (2009)

Q9. Arrange true solution, colloidal solution and suspension decreasing order of their particle size. (2010)

Q10. 45g of ethylene glycol is mixed with 600g of water. Calculate – (2010)
a. the freezing point depression and
b. the freezing point of the solution.
Q11. State Henry’s law relating of solubility of a gas in a liquid and mention two application of the law. (2010)
Q12. Calculate the osmotic pressure at 25°C of a 6% solution of urea. (mol.wt. =60 and R= 0.082ltr-atm/degree/mole) (2011)

Q13. a. Define colligative properties of dilute solution.
b. The vapour pressure of 2% aqua solution of non volatile substance x at 373 K is 755torr. Calculate the molar mass of the solute vapour pressure of water is 373K as 760 torr. (2012)
Q14. Write Roult’s law for relative lowering vapour pressure of solution containing
a. Volatile Solute
b. Non-volatile Solute
(2013)

Q15. 5% urea solution is isotonic with 12.5% solution of an organic compound. If the molecular mass of urea of 60, then calculate the molecular mass of urea of that organic compound. (2013)
Q16. Discuss the following –
a. Osmosis
b. Osmotic pressure
c. Semi-permeable membrane
(2014)
Q17. Boiling point of water at 750 mm Hg is 96.63°C. How much sucrose to be added to 500 g of water such that it boils at 100°C? Molal Elevation constant for water is 0.5K kg/mol. (2014)

Q18. Find out the volume in ml of 0.1M HCl required to completly neutralised 1g of Na2CO3 and NaHCO3 containing equal number of moles of Na2CO3 and NaHCO3. (2015)
Q19. Define parts per million (ppm). (2016)
Q20. 6.02×10^20 molecules of urea present in 100 ml of its solution what is the concentration of urea? (2017)
Q21. An antifreeze solution is prepare from 22.6g of ethylene glycol and 200 gram of water calculate molality of the solution if density of the solution is 1.072g/ltr, then what shall be molarity of the solution? (2018)

Q22. Vapour pressure of water at 293 k is 17.535mmHg. Calculate the paper pressure of water at 293 K when 25 g of glucose is dissolved in 450 g of water. (2019)
Q23. An antifreeze solution is prepare from 222.6g of ethylene glycol and 200 gram of water calculate molality of the solution if density of the solution is 1.072g/ltr, then what shall be molarity of the solution? (2020)

JAC 12th Chemistry Previous Years Important Objective Questions

Q1. The value of colligative properties of a solution increases when solute molecules undergo-(2013, 2015)
a. Association
b. Dissociation
c. Both a and b
d. None of these
Q2. Which of the following aqueous solution has highest boiling point?(2015)
a. 1% glucose
b. 1% sucrose
c. 1% NaCl
d. 1% cacl2
Q3. The normality of 0.2 M aqueous solution of dibasic acid is- (2016)
a. 0.4N
b. 0.1N
c. 0.8N
d. None of these
Q4. A molal solution is one that contains one mole of solute in -(2022)
a. 1000g of solvent
b. 1 litre of solution
c. 1 Ltr of solvent
d. 22.4 Ltr of the solution
Q5. Relative lowering in vapour pressure of solution is equal to – (2022)
a. Molarity of solution
b. Molality of solution
c. Mole fraction of solute
d. Mole fraction of solvent
Q6. Colligative properties of the solution depends on- (2022)
a. Nature of the solution
b. Nature of the solvent
c. Number of solute particles
d. Number of moles of the solvent

Q7. The mole fraction of benzene in solution containing 30% by mass carbon tetrachloride is( molar mass of benzene = 78u and molar mass of ccl4 =154u) (2022)
a. 0.556
b. 0.992
c. 0459
d. 0.783

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