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NEET UG Solutions — practice questions — page 4

Explore 125 free Solutions questions in NEET UG 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 91–120 of 125.

Benzoic acid forms dimers in benzene and shows a van't Hoff factor of 0.6. What percentage of the acid is associated?Read the answer and worked solution →At fixed concentration, osmotic pressure varies how with absolute temperature?Read the answer and worked solution →For a fixed mass of solute, how do colligative effects vary with molar mass?Read the answer and worked solution →Brass is a solid solution of which metals?Read the answer and worked solution →Plotting a gas's partial pressure against its mole fraction gives what slope?Read the answer and worked solution →For dilute solutions, elevation of boiling point is directly proportional to which quantity?Read the answer and worked solution →Osmotic pressure in Pa of 1.0 g polymer (M = 185,000) in 450 mL at 37 C?Read the answer and worked solution →What mass of ascorbic acid (176 g/mol) in 75 g of acetic acid lowers its melting point by 1.5 C? (Kf = 3.9 K kg/mol)Read the answer and worked solution →22 g of benzene is dissolved in 122 g of carbon tetrachloride. What is the mass percentage of benzene?Read the answer and worked solution →30% benzene (78 g/mol) by mass in CCl4 (154 g/mol). Mole fraction of benzene?Read the answer and worked solution →H2S has a solubility of 0.195 m in water at STP (0.987 bar). Taking 55.5 mol water per kg, what is its Henry's law constant?Read the answer and worked solution →Sea water (1030 g per litre) holds 6 × 10^-3 g O2 per litre. What is this in ppm?Read the answer and worked solution →The van't Hoff factor equals the normal molar mass divided by what?Read the answer and worked solution →Why does a non-volatile solute raise the boiling point?Read the answer and worked solution →A binary solution behaves ideally when A-B attractive forces, compared with A-A and B-B forces, are how?Read the answer and worked solution →Pfeffer and van't Hoff's osmotic laws mirror which gas laws?Read the answer and worked solution →HENRY'S LAW states that at constant temperature:Read the answer and worked solution →Salt is sprinkled on icy roads in cold countries to:Read the answer and worked solution →Two are true, one is notRead the answer and worked solution →True or false: concentrationRead the answer and worked solution →Complete the meaning of colligativeRead the answer and worked solution →Tap every statement true of molalityRead the answer and worked solution →The van't Hoff factor (i) for sodium chloride (NaCl) in water is approximately:Read the answer and worked solution →Flip and pair: measure with its denominatorRead the answer and worked solution →The MOLARITY of a solution containing 58.5 g NaCl dissolved in 1 L of solution is:Read the answer and worked solution →Complete the two concentration definitionsRead the answer and worked solution →Naming the measureRead the answer and worked solution →True or false: colligative propertiesRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →

Worked practice questions

Benzoic acid forms dimers in benzene and shows a van't Hoff factor of 0.6. What percentage of the acid is associated?

  1. 20%
  2. 80%
  3. 40%
  4. 60%
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Correct answer: B. 80%

For dimerisation i = 1 - x/2, so 0.6 = 1 - x/2 gives x = 0.8, or 80 percent association.

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At fixed concentration, osmotic pressure varies how with absolute temperature?

  1. Inversely proportional
  2. Not dependent on it
  3. Proportional to its square
  4. Directly proportional
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Correct answer: D. Directly proportional

Osmotic pressure rises in direct proportion to absolute temperature, just as gas pressure does at fixed volume.

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For a fixed mass of solute, how do colligative effects vary with molar mass?

  1. They fall as it rises
  2. They rise as its square
  3. They do not depend on it
  4. They rise as it rises
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Correct answer: A. They fall as it rises

A heavier solute gives fewer moles for the same mass, so every colligative property is inversely proportional to molar mass.

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More Chemistry topics

Amines and BiomoleculesChemical KineticsAldehydes, Ketones and Carboxylic AcidsEquilibriumRedox ReactionsHydrocarbonsChemical Bonding and Molecular StructureStructure of Atom