| 2001 |
Why does a bottle of soda water fizz when it is opened? |
Chemistry
Solubility and Henry’s law |
Easy |
| 2002 |
At a given temperature, four gases have Henry's law constants (in kbar) of 0.4, 1.7, 34 and 76.5. Which gas i… |
Chemistry
Solubility and Henry’s law |
Medium |
| 2003 |
Why are the air tanks used by scuba divers diluted with helium? |
Chemistry
Solubility and Henry’s law |
Medium |
| 2004 |
The dissolution of a certain solid in water is endothermic. How will its solubility change as the temperature… |
Chemistry
Solubility and Henry’s law |
Hard |
| 2005 |
Which pair of liquids forms a nearly ideal solution? |
Chemistry
Vapour pressure and Raoult’s law |
Easy |
| 2006 |
Which statement about a solution showing negative deviation from Raoult's law is correct? |
Chemistry
Vapour pressure and Raoult’s law |
Easy |
| 2007 |
Liquids A and B form an ideal solution. p_A° = 400 mm Hg and p_B° = 200 mm Hg. What is the total vapour press… |
Chemistry
Vapour pressure and Raoult’s law |
Medium |
| 2008 |
For the solution in which p_A° = 400 mm Hg, p_B° = 200 mm Hg and x_A = 0.25, what is the mole fraction of A i… |
Chemistry
Vapour pressure and Raoult’s law |
Hard |
| 2009 |
Why can a 95% ethanol–water mixture not be made purer by simple fractional distillation? |
Chemistry
Vapour pressure and Raoult’s law |
Medium |
| 2010 |
Which of these is NOT a colligative property? |
Chemistry
Colligative properties |
Easy |
| 2011 |
What is the elevation in boiling point of a 0.5 mol kg⁻¹ aqueous solution of urea? (Kb of water = 0.52 K kg m… |
Chemistry
Colligative properties |
Easy |
| 2012 |
What is the osmotic pressure of a 0.1 M solution of a non-electrolyte at 300 K? (R = 0.0821 L atm K⁻¹ mol⁻¹) |
Chemistry
Colligative properties |
Medium |
| 2013 |
What happens to red blood cells placed in a solution with a salt concentration higher than that of blood plas… |
Chemistry
Colligative properties |
Medium |
| 2014 |
In reverse osmosis used to desalinate seawater, what must be true of the pressure applied on the seawater sid… |
Chemistry
Colligative properties |
Hard |
| 2015 |
What is the van't Hoff factor of K₂SO₄ assuming complete dissociation in water? |
Chemistry
Abnormal molar mass and van’t Hoff factor |
Easy |
| 2016 |
Ethanoic acid forms dimers in benzene. Compared with its true molar mass, the molar mass found from freezing … |
Chemistry
Abnormal molar mass and van’t Hoff factor |
Easy |
| 2017 |
What is the depression in freezing point of 0.1 mol kg⁻¹ aqueous NaCl, assuming complete dissociation? (Kf = … |
Chemistry
Abnormal molar mass and van’t Hoff factor |
Medium |
| 2018 |
Which 0.1 mol kg⁻¹ aqueous solution has the lowest freezing point? |
Chemistry
Abnormal molar mass and van’t Hoff factor |
Medium |
| 2019 |
A salt of type AB₂ dissociates partially in water and its van't Hoff factor is found to be 2.6. What is its d… |
Chemistry
Abnormal molar mass and van’t Hoff factor |
Hard |
| 2020 |
In a Daniell cell, which process takes place at the anode? |
Chemistry
Galvanic cells and electrode potential |
Easy |