Important Questions of Some Basic Concepts of Chemistry Chemistry | Zigya

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21.

If the molecular wt. of Na2SOand I2 are M1 and Mrespectively then what will be the equivalent weight of Na2SO3 and I2 in the following reaction?

2S2O32- + I2 → S4O62- + 2I-

  • M1, M2

  • M1, M2 /2

  • 2M1, M2

  • M1, 2M2


22.

The normality of 30 volume H2O2 is

  • 2.678 N

  • 5.336 N

  • 8.034 N

  • 6.685 N


23.

The weight of oxalic acid that will be required to prepare a 1000 mL (N/20) solution is

  • 126/100 g

  • 63/40 g

  • 63/20 g

  • 126/20 g


24.

Gaseous benzene reacts with hyodrogen gas in presence of a nickel catalyst to form gaseous cyclohexane according to the reaction, 

C6H6 (g) + 3H2 (g) → C6H12 (g)

A mixture of C6H6 and excess H2 has a pressure of 60 mm of Hg in an unknown volume. After the gas had been passed over a nickel catalyst and all the benzene converted to cyclohexane, the pressure of the gas was 30 mm of Hg in the same volume at the same temperature. The fraction of C6H6 (by volume) present in the original volume is

  • 1/3

  • 1/4

  • 1/5

  • 1/6


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25.

The dissolution of Al(OH)3 by a solution of NaOH results in the formation of

  • [Al(H2O)4(OH)2]+

  • [Al(H2O)3(OH)3]

  • [Al(H2O)2(OH)4]-

  • [Al(H2O)6(OH)3


26.

The molarity of NO3- in the solution after 2L of 3M AgNO3 is mixed with 3L of 1M BaCl2 is

  • 1.2 M

  • 1.8 M

  • 0.5 M

  • 0.4 M


27.

2.76 g of silver carbonate on being strongly heated yields a residue weighing

  • 3.45g 

  • 3.0g

  • 1.36g

  • 2.16g


28.

The volume strenght  of 1.5 N H2O2 solution is 

  • 16.8L

  • 8.4L

  • 4.2L

  • 5.2L


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29.

19.85 mL of 0.1 N NaOH reacts with 20 mL of HCl solution for complete neutralisation. The molarity of HCl solution is

  • 9.9

  • 0.99

  • 0.099

  • 0.0099


30.

Which has the maximum number of molecules among the following?

  • 44 g CO2

  • 48 g O3

  • 8g H2

  • 64g SO2


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