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Agniveer Air Force Solutions — practice questions

Explore 13 free Solutions questions in Agniveer Air Force Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Solutions questions and exercises with answers

Showing questions 1–13 of 13.

Colligative properties of a dilute solution depend on:Read the answer and worked solution →Complete the two concentration definitionsRead the answer and worked solution →Molarity or molality?Read the answer and worked solution →True or false: concentrationRead the answer and worked solution →Naming the measureRead the answer and worked solution →Complete the meaning of colligativeRead the answer and worked solution →True or false: colligative propertiesRead the answer and worked solution →Tap every statement true of molalityRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Flip and pair: measure with its denominatorRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →

Worked practice questions

Colligative properties of a dilute solution depend on:

  1. The pressure only
  2. The temperature only
  3. The number of solute particles, not their nature
  4. The chemical nature of the solute
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Correct answer: C. The number of solute particles, not their nature

By definition, colligative properties (relative lowering of vapour pressure, boiling-point elevation, freezing-point depression, osmotic pressure) depend on how many solute particles are dissolved, not what those particles are. One mole of glucose and one mole of urea cause the same boiling-point elevation in 1 kg of water. With electrolytes like NaCl that dissociate into 2 ions, the effective particle count is multiplied by the van't Hoff factor $i$ (close to 2 for NaCl in dilute solution).

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Complete the two concentration definitions

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Missing parts
  1. Answer
    solution
    Choices
    1. solution
    2. solvent
    3. solute
  2. Answer
    solvent
    Choices
    1. solvent
    2. solution
    3. solute
Complete the statement
Molarity is the number of moles of solute in one litre of {0}. Molality is the number of moles of solute per kilogram of {1}.
One word separates them: solution against solvent. Source: syllabus Chemistry, Ch 1 Solutions.

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Molarity or molality?

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Items
  1. Item
    Per litre of solution
    Category
    Molarity
  2. Item
    Symbol M
    Category
    Molarity
  3. Item
    Uses a volume
    Category
    Molarity
  4. Item
    Per kilogram of solvent
    Category
    Molality
  5. Item
    Symbol m
    Category
    Molality
  6. Item
    Uses a mass
    Category
    Molality
Categories
  1. Item
    Molarity
  2. Item
    Molality
Molarity divides by volume of solution; molality by mass of solvent. That makes molality independent of temperature. Source: syllabus Chemistry, Ch 1 Solutions.

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