Search questions
Use text search or combine filters to find exactly the questions you need.
Class 12 · Chemistry
→For molar-mass determination of a non-electrolyte solute, which statement is correct?
Class 12 · Chemistry
→If a solute completely dissociates into three ions in solution, how will its apparent molar mass compare with its true molar mass?
Class 12 · Chemistry
→A solute has a true molar mass of 60 g mol⁻¹, but freezing-point depression gives an apparent molar mass of 30 g mol⁻¹. What is the van’t Hoff factor?
Class 12 · Chemistry
→Which method often needs very precise measurement because the temperature change is very small?
Class 12 · Chemistry
→If the molar mass of an acid in benzene, determined from freezing-point depression, is nearly double the expected value, what does it indicate?
Class 12 · Chemistry
→Which assumption is necessary while determining molar mass by relative lowering of vapour pressure?
Class 12 · Chemistry
→In the osmotic-pressure method, using M = wRT/(πV), what does V represent?
Class 12 · Chemistry
→1.5 g of a non-volatile solute dissolved in 50 g of benzene raises its boiling point by 0.78 K. If Kb for benzene is 2.6 K kg mol⁻¹, what is the molar mass of the solute?
Class 12 · Chemistry
→If 2 g of a solute dissolved in 100 g of water lowers the freezing point by 0.186 K, and Kf for water is 1.86 K kg mol⁻¹, what is the molar mass of the solute?
Class 12 · Chemistry
→Why is the osmotic-pressure method considered especially useful for determining the molar mass of biomolecules?
Class 12 · Chemistry
→Equal masses of two non-volatile solutes are dissolved in equal masses of the same solvent. If the first solution shows a greater freezing-point depression, what can be concluded about the first solute?
Class 12 · Chemistry
→In the freezing-point depression method, in which situation will the calculated molar mass of a solute be higher than its true value?
Class 12 · Chemistry
→The molar mass of a solute determined by osmotic pressure is lower than its normal value. What is the most suitable reason?
Class 12 · Chemistry
→The molar mass of an unknown non-volatile solute is determined using boiling-point elevation. If the solvent mass is halved while the solute mass remains unchanged, what happens to the elevation?
Class 12 · Chemistry
→In molar mass determination, if the observed van’t Hoff factor is i < 1, what is the most suitable conclusion?
Class 12 · Chemistry
→A 1 L solution is prepared from 3.6 g of a solute. At 300 K, its osmotic pressure is 0.369 atm. If the solute undergoes 25% dimerization, what is its approximate true molar mass?
Class 12 · Chemistry
→An AB₂ solute has a van’t Hoff factor of 2.6, and its true molar mass is 156 g mol⁻¹. What are its observed molar mass and degree of dissociation?
Class 12 · Chemistry
→When 0.5 g of a solute is dissolved in 250 g of water, the freezing-point depression is 0.0186 K. If i = 1 and Kf for water is 1.86 K kg mol⁻¹, what is the molar mass?
Class 12 · Chemistry
→If a solute has i = 0.4 and a true molar mass of 80 g mol⁻¹, what will be the observed molar mass determined by a colligative method?
Class 12 · Chemistry
→