20 volume H2O2 solution has a strenght of about from Chemistry S

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 Multiple Choice QuestionsMultiple Choice Questions

371.

When 10g of 90% pure lime stone is heated completely, the volume (in litres) of CO2 is liberated at STP is

  • 22.4

  • 2.24

  • 20.16

  • 2.016


372.

Which one of the following has unit positive charge and 1 amu mass ?

  • Electron

  • Neutron

  • Proton

  • None of these


373.

Law of constant composition is same as the law of

  • conservation of mass

  • conservation of energy

  • multiple proportion

  • definite proportion


374.

By dissolving 5 g substance in 50 g of water, the decrease in freezing point is 1.2°C. The gram molal depression is 1.85°C. The molecular weight of substance is :

  • 105.4

  • 118.2

  • 137.2

  • 154.2


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375.

If molecular weight of KMnO4 is M, then its equivalent weight in acidic medium would be

  • M

  • M/2

  • M/5

  • M/3


376.

The volume of oxygen necessary for the complete combustion of 20 L of propane is :

  • 40 L

  • 60 L

  • 80 L

  • 100 L


377.

A gaseous mixture contains 56 g of N2, 44 g of CO2 and 16 g of CH4. The total pressure of mixture is 720 mm of Hg. The partial pressure of methane is :

  • 75 atm

  • 160 atm

  • 180 atm

  • 215 atm


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378.

20 volume H2O2 solution has a strenght of about

  • 30%

  • 6%

  • 3%

  • 10%


B.

6%

20 volumes of H2O2 means 20 L of oxygen is obtained at STP by the decomposition of 1L H2O2 solution

   2H2O22mol 2H2O +O21mol  68g                 22.4 L at STP

22.4 L oxygen is obtained from 68g H2O2.

20 L oxygen is obtained from                  = 6822.4×20= 60.7g H2O21000mL of H2O2 solution contain 60.7g H2O2100mL(100g) solution conatins 60.71000×100strenght of H2O2 solution = 6.07g H2O2 = 6.07%


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379.

74.5 g of a metallic chloride contains 35.5 g of chlorine, the  quivalent weight of the metal is

  • 19.5

  • 35.5

  • 39

  • 78.0


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