64 g of an organic compound contains 24 g of carbon, 8 g of hydro

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 Multiple Choice QuestionsMultiple Choice Questions

141.

If an organic compound has C = 40%, H = 13.3% and N = 46.67%, then the empirical formula of this compound is

  • CH4N

  • C2H8N2

  • CH3N

  • None of these


142.

Which of the following units of energy, represents maximum amount of energy?

  • Calorie

  • Joule

  • Erg

  • Electron volt


143.

A compound has the empirical formula CH2O. Its vapour density is 30. Its molecular formula is

  • C2H4O2

  • C2H6O

  • C2H6O2

  • C2H4O


144.

Combustion of liquid benzene in oxygen occurs as 2C6H6 + 15O2 → 12CO2 + 6H2O. At STP, what volume (in litre) of oxygen is required for the full combustion of 3.9 g liquid benzene?

  • 11.2 L

  • 22.4 L

  • 8.4 L

  • 7.4 L


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145.

64 g of an organic compound contains 24 g of carbon, 8 g of hydrogen and the rest oxygen. The empirical formula of the compound is

  • CH2O

  • C2H4O

  • CH4O

  • C2H8O


C.

CH4O

Weight of organic compound = 64 gm

Weight of carbon = 24 gm

Weight of hydrogen = 8 gm

Weight of oxygen = 64 - (24 + 8) gm = 32 gm

Percentage of carbon = 2464 × 100%

 Percentage of carbon = 37.5%

Percentage of hydrogen = 864 × 100 %

 Percentage of hydrogen = 12.5%

Percentage of oxygen = 3264 × 100 %

 Percentage of oxygen = 50 %

% of element C (37.5%) H (12.5%+) O (50%)
Mole 37.512 12.51 5016
relative number of atoms 3.125 12.5 3.125
Simplest atomic ratio 3.1253.125 = 1 12.53.125 = 4 3.1253.125= 1

Hence, the empirical formula of compound is CH4O.


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146.

1f 20 mL of 0.4 N NaOH solution completely neutralises 40 mL of a dibasic acid, the molarity of the acid solution is

  • 0.1 M

  • 0.2 M

  • 0.3 M

  • 0.4 M


147.

Molality of a solution is equal to

  • number of moles of solutenumber of litres of solution

  • number of g-equivalents of solutenumber of litres of solution

  • number of moles of solutenumber of kilogram of solvent

  • number of moles of a componenttotal number of moles of all components


148.

The sample with largest number of atoms is

  • 1g O2(g)

  • 1g Ni(s)

  • 1g B(s)

  • 1g N2(g)


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149.

An organic compound containing C, H and N gives the following on analysis : C = 40%, H = 13.33% and N = 46.67%. What would be its empirical formula?

  • C2H7N

  • C2H7N2

  • CH4N

  • CH3N


150.

The normality of 0.2M H3PO2 is

  • 0.2 N

  • 0.4 N

  • 0.6 N

  • 0.06 N


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