4.9 g of H2SO4 is present in 100 mL solution. The molarity and no

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 Multiple Choice QuestionsMultiple Choice Questions

151.

How many moles of O2 can be obtained by electrolysis of 90 g H2O?

  • 5.0 mol

  • 0.5 mol

  • 2.5 mol

  • 0.25 mol


152.

An organic compound A contains 20% C, 46.66% N and 6.66% H. It gives NH3 gas on heating with NaOH. A can be

  • CH3CONH2

  • C6H5CONH2

  • NH2CONH2

  • CH3NHCONH2


153.

The empirical formula of a compound is CH2. One mole of this compound has a mass 42g. Its molecular formula is

  • C3H6

  • C2H6

  • CH2

  • C2H2


154.

Aqueous solutions of hydrogen sulphide and sulphur dioxide when mixed together, yield

  • sulphur trioxide and water

  • hydrogen and sulphurous acid

  • sulphur and water

  • hydrogen peroxide and sulphur


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155.

3 g of oxide of a metal is converted to chloride completely and it yielded 5 g of chloride. The equivalent weight of metal is

  • 12

  • 20

  • 33.25

  • 2.325


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156.

4.9 g of H2SO4 is present in 100 mL solution. The molarity and normality of the solution will be

  • Molarity = 1M, Normality= 0.5N

  • Molarity = 1M, Normality= 0.25N

  • Molarity = 0.5M, Normality= 1N

  • Molarity = 2M, Normality= 3N


C.

Molarity = 0.5M, Normality= 1N

Given, Mass of H2SO4(w) = 49GVolume of solution (V) = 100 mL Molar mass (M) = 98Molarity(C) =w×1000M ×V   C =4998×1000100Molarity = 0 .5 mol/L ,0 .5 MNormality (N) = Z × molarity (C) Where, Z = equivalent factorFor H2SO4(Z=2) = 0.5MNormality =2 ×0. 5 = 1 N


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157.

0.0833 mole of a carbohydrate of empirical formula CH2O contains 1.00 g of hydrogen. The molecular formula of the carbohydrate is.

  • C5H10O5

  • C3H4O3

  • C12H22O11

  • C6H12O6


158.

When 50cm3 of 0.2N H2SO4 is mixed with 50 cm3 of 1N KOH, the heat liberated is

  • 11.46 kJ

  • 57.3 kJ

  • 573 kJ

  • 573 J


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159.

Heat liberated with 100 mL of 1 N NaOH is neutralised by 300 mL of 1 N HCl

  • 11.56 kJ

  • 5.73 kJ

  • 22.92 kJ

  • 17.19 kJ


160.

A solution contains 1.2046 x 1024 hydrochloric acid molecules in one dm3 of the solution. The strength of the solution is

  • 6N

  • 2N

  • 4N

  • 8N


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