Equal moles of water and urea are taken in a flask. What is mass

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 Multiple Choice QuestionsMultiple Choice Questions

211.

What is the effect of having the pressure by doubling the volume on the following system at 500°C?

H2 (g) + I2 (g)  2HI (g)

  • Shift to reactant side

  • Shift to product formation

  • Liquefaction of HI

  • No effect


212.

The number of coulombs required to reduce 12.3 g of nitrobenzene to aniline is :

  • 115800 C

  • 5790 C

  • 28950 C

  • 57900 C


213.

The strength in volumes of a solution containing 30.36 g/L of H2O2 is:

  • 10 volume

  • 20 volume

  • 5 volume

  • None of these


214.

Which of the following concentration units is independent of temperature ?

  • Normality

  • Molarity

  • Formality

  • Molality


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215.

How many moles of Al2(SO4)a would be in 50 gm of the substance ?

  • 0.083 mol

  • 0.952 mol

  • 0.481 mol

  • 0.140 mol


216.

If 3.01 × 1020 molecules are removed from 98 mg of H2SO4, then number of moles of H2SO4 left are

  • 0.1 × 10-3 mol

  • 9.95 × 10-2 mol

  • 0.5 × 10-3 mol

  • 1.66 × 10-3 mol


217.

One mole of CO2 contains:

  • 3g atoms of CO2

  • 18.1 × 1023 molecules of CO2

  • 6.02 × 1023 atoms of O

  • 6.02 × 1023 atoms of C


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218.

Equal moles of water and urea are taken in a flask. What is mass percentage of urea in the solution?

  • 23.077%

  • 230.77%

  • 2.3077%

  • 0.23077%


A.

23.077%

If H2O = x mol = 18x g then urea = x mol = 60x gTotal mass of the solution = 18x + 60x = 78x gMass % of urea = 18x78x× 100 = 23.077%


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219.

Volume of water needed to mix with 10 mL N HCl to get 0.1 N HCl is:

  • 900mL

  • 9mL

  • 90mL

  • 100mL


220.

The mass of 1 mole of electron is

  • 9.1 × 10-28 g

  • 1.008 mg

  • 0.55 mg

  • 9.1 × 10-27 g


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