32g of O2, 2g of H2 and 28g of N2 at STP, occupy separately a vol

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 Multiple Choice QuestionsMultiple Choice Questions

91.

Commercial 11.2 volume H2O2 solution has a molarity of :

  • 1.0

  • 0.5

  • 11.2

  • 1.12


92.

100 g CaCO3 is treated with 1 L of 1N HCl. What would be the weight of CO2 liberated after the completion of the reaction ?

  • 55 g

  • 11 g

  • 22 g

  • 33 g


93.

Law of multiple proportions is illustrated by one of the following pairs :

  • N2O and NO

  • H2S and SO2

  • NH3 and Na2O

  • BeO and BeCl2


94.

Avogadro's hypothesis states that :

  • the ideal gas consists of a large number of small particles called molecules

  • under the same conditions of temperature and pressure equal volumes of gases contain the same number of molecules

  • volume of a definite quantity of gas at constant pressure is directly proportional to absolute temperature

  • a given mass of gas at constant pressure is directly proportional to absolute temperature


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95.

If 117 gm NaCl is dissolved in 1000 g of water the concentration of the solution is said to be :

  • 2 molar

  • 2 molal

  • 1 normal

  • 1 molal


96.

A solution of 4.5 g of a pure non-electrolyte in 100 g of water was found to freeze at 0.465°C. The molecular weight of the solute is closest to (kf =1.86)

  • 180.0

  • 135.0

  • 172.0

  • 90.0


97.

Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11 % mass of hydrogen. This is explained by the law of; 

  • conservation of mass

  • constant composition

  • multiple proportion

  • Gay-Lussa


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98.

32g of O2, 2g of H2 and 28g of N2 at STP, occupy separately a volume of:

  • 1L

  • 2L

  • 22.4L

  • 2.24L


C.

22.4L

Gram molecular weight (= 1 mol) of any gas contains the volume = 22.4 L


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99.

Identify the incorrect statement :

  • The molarity of a solution is independent of temperature

  • The tendency for catenation is much higher for carbon than for silicon

  • Nitriles and iso nitriles constitute metamers

  • t-butyl 1-carbocation has planar carbons and is very reactive


100.

The pH of 0.005 M H2SO4 is :

  • 2.5

  • 1.5

  • 1.0

  • 2.0


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