The equivalent mass of a certain bivalent metal is 20. The molecu

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 Multiple Choice QuestionsMultiple Choice Questions

191.

The mass of 112cm3 of NH3 gas at STP is

  • 0.085g

  • 0.850g

  • 8.500g

  • 80.500g


192.

The number of moles of hydrogen that can be added to 1 mole of an oil is the highest in

  • groundnut oil

  • sunflower seed oil

  • mustard oil

  • linseed oil


193.

The volume of 0.1 M oxalic acid that can be completely oxidized by 20 mL of 0.025 M KMnO4 solution is

  • 25 mL

  • 12.5 mL

  • 37.5 mL

  • 125 mL


194.

The vapour pressures of two liquids A and B in their pure states are in the ratio of 1: 2. A binary solution of A and B contains A and B in the mole proportion of 1 : 2. The mole fraction of A in the vapour phase of the solution will be

  • 0.2

  • 0.25

  • 0.52

  • 0.33


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195.

On adding which of the following, the pH of 20 mL of 0.1 N HCl will not alter?

  • 20 mL of distilled water

  • 1 mL of 0.1 N NaOH

  • 500 mL of HCl of pH =1

  • 1 mL of 1 N HCl


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196.

The equivalent mass of a certain bivalent metal is 20. The molecular mass of its anhydrous chloride is

  • 111

  • 55.5

  • 75.5

  • 91


A.

111

Atomic weight of metal = equivalent weight × valency

                                  = 20 × 2 = 40

Molecular formula of metal chloride = MCl2

 Molecular mass of MCl2 = 40 + 2 × 35.5 = 111 g mol-1


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197.

The approximate time duration in hours to electroplate 30 g of calcium from molten calcium chloride using a current of 5 A is [At. mass of Ca = 40]

  • 80

  • 10

  • 16

  • 8


198.

1.78 g of an optically active L-amino acid (A) is treated with NaNO3/ HCl at 0°C. 448 cm3 of nitrogen was at STP is evolved. A sample of protein has 0.25% of this amino acid by mass. The molar mass of the protein is

  • 36500 g mol-1

  • 34500 g mol-1

  • 35400 g mol-1

  • 35600 g mol-1


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199.

10 g of a mixture of BaO and CaO requires 100 cm3 of 2.5 M HCl to react completely. The percentage of calcium oxide in the mixture is approximately (Given: molar mass of BaO = 158)

  • 52.6

  • 55.1

  • 44.9

  • 47.4


200.

Impure copper containing Fe, Au, Ag as impurities is electrolytically refined. A current of 140 A for 482.5 s decreased the mass of the anode by 22.26 g and increased the mass of cathode by 22.011 g. Percentage of iron in impure copper is (Given molar mass Fe = 55.5 g mol-1, molar mass Cu = 63.54 g mol-1)

  • 0.95

  • 0.85

  • 0.96=7

  • 0.90


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