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Write the name of gas released when Cu is added to the conc. HNO3
Concept: Solubility >> Solubility of a Gas in a Liquid
Answer the following question.
What type of stoichiometric defect is shown by ZnS and why?
Concept: Imperfections in Solids >> Types of Point Defects - Stoichiometric Defects
A 4% solution(w/w) of sucrose (M = 342 g mol−1) in water has a freezing point of 271.15 K. Calculate the freezing point of 5% glucose (M = 180 g mol−1) in water.
(Given: Freezing point of pure water = 273.15 K)
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
An element crystallizes in fcc lattice with a cell edge of 300 pm. The density of the element is 10.8 g cm−3. Calculate the number of atoms in 108 g of the element.
Concept: Calculations Involving Unit Cell Dimensions
Which of the following is not a characteristic of a crystalline solid?
Concept: General Characteristics of Solid State
Value of Henry's constant KH ______.
Concept: Solubility >> Solubility of a Gas in a Liquid
Which one of the following would feel attraction when placed in magnetic field: Co2+, Ag+, Ti4+, Zn2+
Concept: Properties of Solids: Magnetic Properties
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 >> 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
