The number of moles of a solute in its solution is 20 and total n

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 Multiple Choice QuestionsMultiple Choice Questions

131.

The oxide of a metal contains 40% of oxygen. The valency of metal is 2. What is the atomic weight of metal?

  • 24

  • 13

  • 40

  • 36


132.

Which of the following reactions does not take place?

  • F2 + 2Cl- → 2F- + Cl2

  • Br2 + 2I- → 2Br- + I2

  • Cl2 + 2Br- → 2Cl- + Br2

  • Cl2 + 2F- → 2Cl- + F2


133.

What weight of hydrated oxalic acid should be added for complete neutralisation of 100 mL of 0.2 N -NaOH solution?

  • 0.45 gm

  • 0.90 gm

  • 1.08 gm

  • 1.26 gm


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134.

The number of moles of a solute in its solution is 20 and total number of moles are 80. The mole fraction of solute is

  • 2.5

  • 0.25

  • 1

  • 0.75


B.

0.25

Mole fraction of a constituent is the fraction obtained by dividing the number of moles of that constitutent by the total number of moles of all the constituents present in the solution.

 Mole fraction of solute = number of moles of soluteno. of moles of (solute + solvent)                                        = 2080

                                 = 2.5


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135.

How many millilitres of 20 volume H2O2 solution is needed to react completely with 500 mL of acidified 1 N KMnO4 solution?

  • 224

  • 280

  • 140

  • 56


136.

The molarity of a solution made by mixing 50mL of conc. H2SO4 (36N) with 50mL of water, is

  • 36M

  • 18M

  • 9M

  • 6M


137.

171g of sugar cane (C12H22O11) is dissolved in 1 L of water. The molarity of the solution is

  • 2.0 M

  • 1.0 M

  • 0.5 M

  • 0.25 M


138.

The volume of 0.1 M H2SO4 that is needed to completely neutralise 30mL of 0.2 M NaOH solution, is

  • 15mL

  • 30mL

  • 40mL

  • 60mL


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139.

1 moles of crystalline NaCl will have how many unit cells ?

  • 1.506 × 1023

  • 3.012 × 1023

  • 4.518 × 1023

  • 6.023 × 1023


140.

A mixture has 18g water and 414g ethanol. The mole fraction of water in mixture is (assume ideal behaviour of the mixture)

  • 0.1

  • 0.4

  • 0.7

  • 0.9


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