Please select a subject first
Advertisements
Advertisements
Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion: Magnetic moment values of actinides are lesser than the theoretically predicted values.
Reason: Actinide elements are strongly paramagnetic.
Select the most appropriate answer from the options given below:
Concept: Properties of Solids: Magnetic Properties
State Henry’s law and explain why are the tanks used by scuba divers filled with air diluted with helium (11.7% helium, 56.2% nitrogen and 32.1% oxygen)?
Concept: Solubility >> Solubility of a Gas in a Liquid
Assume that argon exerts a partial pressure of 6 bar. Calculate the solubility of argon gas in water. (Given Henry’s law constant for argon dissolved in water, KH = 40 k bar)
Concept: Solubility >> Solubility of a Gas in a Liquid
Read the passage carefully and answer the questions that follow:
| Henna is investigating the melting point of different salt solutions. She makes a salt solution using 10 mL of water with a known mass of NaCl salt. She puts the salt solution into a freezer and leaves it to freeze. She takes the frozen salt solution out of the freezer and measures the temperature when the frozen salt solution melts. She repeats each experiment. |
| S.No | Mass of the salt used in g |
Melting point in °C | |
| Readings Set 1 | Reading Set 2 | ||
| 1 | 0.3 | -1.9 | -1.9 |
| 2 | 0.4 | -2.5 | -2.6 |
| 3 | 0.5 | -3.0 | -5.5 |
| 4 | 0.6 | -3.8 | -3.8 |
| 5 | 0.8 | -5.1 | -5.0 |
| 6 | 1.0 | -6.4 | -6.3 |
Assuming the melting point of pure water as 0°C, answer the following questions:
- One temperature in the second set of results does not fit the pattern. Which temperature is that? Justify your answer.
- Why did Henna collect two sets of results?
- In place of NaCl, if Henna had used glucose, what would have been the melting point of the solution with 0.6 g glucose in it?
OR
What is the predicted melting point if 1.2 g of salt is added to 10 mL of water? Justify your answer.
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
Assertion (A) : Osmotic pressure is a colligative property.
Reason (R) : Osmotic pressure is proportional to the molality.
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
An azeotropic mixture of two liquids will have a boiling point lower than either of the two liquids when it ______.
Concept: Vapour Pressure of Liquid Solutions >> Vapour Pressure of Liquid- Liquid Solutions
Assertion (A): Elevation in boiling point is a colligative property.
Reason (R): The lowering of vapour pressure of solution causes elevation in boiling point.
Concept: Colligative Properties and Determination of Molar Mass >> Elevation of Boiling Point
Solubility of gas in liquid decreases with increase in ______.
Concept: Solubility >> Solubility of a Gas in a Liquid
Assertion (A): The enthalpy of mixing Δmix H is equal to zero for an ideal solution.
Reason (R): For an ideal solution the interaction between solute and solvent molecules is stronger than the interactions between solute-solute or solvent-solvent molecules.
Concept: Ideal and Non-ideal Solutions
1 mole of liquid A and 2 moles of liquid B make a solution having a total vapour pressure of 40 torr. The vapour pressure of pure A and pure B are 45 torr and 30 torr, respectively. The above solution ______.
Concept: Ideal and Non-ideal Solutions
If the molality of a dilute solution is doubled, the value of the molal elevation constant (Kb) will be ______.
Concept: Colligative Properties and Determination of Molar Mass >> Elevation of Boiling Point
Which of the following aqueous solution will have the highest boiling point?
Concept: Colligative Properties and Determination of Molar Mass >> Elevation of Boiling Point
Out of the following 1.0 M aqueous solution, which one will show the largest freezing point depression?
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
Which of the following is not correct?
Concept: Classification of Crystalline Solids
In which of the following solvents, the \[\ce{C4H8NH3+X–}\] is soluble?
Concept: Solubility >> Solubility of a Gas in a Liquid
What is the effect of temperature on the solubility of glucose in water?
Concept: Solubility >> Solubility of a Solid in a Liquid
Ibrahim collected 10 mL each of fresh water and ocean water. He observed that one sample labeled “P” froze at 0° C while the other “Q” at -1.3° C. Ibrahim forgot which of the two, “P” or “Q” was ocean water. Help him identify which container contains ocean water, giving rationalization for your answer.
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
Calculate Van't Hoff factor for an aqueous solution of K3 [Fe(CN)6] if the degree of dissociation (α) is 0.852. What will be boiling point of this solution if its concentration is 1 molal? (Kb = 0.52 K kg/mol)
Concept: Abnormal Molar Masses
What type of deviation from Roult’s Law is expected when phenol and aniline are mixed with each other? What change in the net volume of the mixture is expected? Graphically represent the deviation.
Concept: Ideal and Non-ideal Solutions
The vapour pressure of pure water at a certain temperature is 23.80 mm Hg. If 1 mole of a non-volatile non-electrolytic solute is dissolved in 100g water, Calculate the resultant vapour pressure of the solution.
Concept: Colligative Properties and Determination of Molar Mass >> Relative Lowering of Vapour Pressure
