What is the molality of a solution containing 200 mg of urea (mol

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which among the following gases can be liquified easily?

  • Chlorine

  • Nitrogen

  • Oxygen

  • Hydrogen


2.

The plot of square root of frequency of X-ray emitted against atomic number led to suggestion of which law/rule?

  • Periodic law

  • Modern periodic law

  • Hund's rule

  • Newland's law


3.

If average velocity of a sample of gas molecules at 300 K is 5 cm s-1, what is RMS velocity of same sample of gas molecules at the same temperature? (Given, α: u: v = 1:1.224: 1.127)

  • 6.112 cm/s

  • 4.605 cm/s

  • 4.085 cm/s

  • 5.430 cm/s


4.

20 mL solution of 0.1 M ferrous sulphate was completely oxidised using a suitable oxidising agent. What is the number of electrons exchanged?

  • 1.204 x 1022

  • 193

  • 1930

  • 1.204 x 1021


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5.

The volume of oxygen evolved at STP by decomposition of 0.68 g '20 volume' hydrogen peroxide solution is

  • 2.24mL

  • 22.4mL

  • 224mL

  • 2240mL


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6.

What is the molality of a solution containing 200 mg of urea (molar mass 60 g mol-1) dissolved in 40 g of water?

  • 0.0825

  • 0.825

  • 0.498

  • 0.0013


C.

0.498

 Molality (m) = mass of solvent (in g) × 1000molecular weight of solute × mass of solvent (in g)                       = 200 × 10-3 × 100060 × 40= 0.0833


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7.

The work done when two mole of an ideal gas is compressed form a volume of 5 m3 to 1 dm3 at 300 K, under a pressure of 100 kPa is

  • 499.9kJ

  • -499.9 kJ

  • -99.5 kJ

  • 42495 kJ


8.

Assuming enthalpy of combustion of hydrogen at 273 K is -286 kJ and enthalpy of fusion of ice at the same temperature to be +6.0 kJ, calculate enthalpy change during formation of 100 g of ice.

  • +1622 kJ

  • - 1622 kJ

  • +292 kJ

  • - 292 kJ


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9.

What is the orbital angular momentum of an electron in 'f'  orbital?

  • 1.5hπ

  • 6hπ

  • 3hπ

  • 3h2π


10.

The product of molar concentrations of hydrogen ions and hydroxide ions in a 0.01 M aqueous solution of sodium chloride is known as

  • hydrolysis constant of salt

  • dissociation constant of acid

  • dissociation constant of base

  • ionic product of water


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