Excess of carbon dioxide is passed through 50 mL of 0.5 M calcium

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171.

The volume of 10 N and 4 N HCl required to make 1 L of 7 N HCl are

  • 0.50 L of 10 N HCl and 0.50 L of 4 N HCl

  • 0.60 L of 10 N HCl and 0.40 L of 4 N HCl

  • 0.80 L of 10 N HCl and 0.20 L of 4 N HCl

  • 0.75 L of 10 N HCl and 0.25 L of 4 N HCl


172.

An oxide of the element contains 20% O2 by weight. Calculate the equivalent weight of the element.

  • 8

  • 16

  • 32

  • 12


173.

For the reaction Fe2O3 + 3CO → 2Fe + 3CO2, the volume of carbon monoxide required to reduce one mole of ferric oxide is

  • 22.4 dm3

  • 44.8 dm3

  • 67.2 dm3

  • 11.2 dm3


174.

10 cm3 of 0.1 N monobasic acid requires 15 cm3 of sodium hydroxide solution whose normality is

  • 1.5 N

  • 0.15 N

  • 0.066 N

  • 0.66 N


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175.

Mass of 0.1 mole of methane is

  • 1 g

  • 16 g

  • 1.6 g

  • 0.1 g


176.

80 g of oxygen contains as many atoms as in

  • 80 g of hydrogen

  • 1 g of hydrogen

  • 10 g of hydrogen

  • 5 g of hydrogen


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177.

Excess of carbon dioxide is passed through 50 mL of 0.5 M calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with 0.1 N hydrochloric acid. The volume of hydrochloric acid required is (Atomic mass of calcium = 40)

  • 300 cm3

  • 200 cm3

  • 500 cm3

  • 400 cm3


C.

500 cm3

No. of millimoles of Ca(OH)2 = 50 × 0.5 = 25

No. of millimoles of CaCO3 = 25

No. of milliequivalents of CaCO3 = 50

 Volume of 0.1 N HCl = 500.1 = 500 cm3


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178.

A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is

  • 182

  • 168

  • 192

  • 188


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179.

A mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca2+ ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of Cao. The percentage of NaCl in the mixture (atomic mass of Ca = 40) is

  • 75

  • 30.6

  • 25

  • 69.4


180.

A mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the calcium ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture is (atomic mass of Ca = 40)

  • 75

  • 31.5

  • 40.2

  • 25


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