21.

If the molecular wt. of Na₂SO₃ and I₂ are M₁ and M₂ respectively then what will be the equivalent weight of Na₂SO₃ and I₂ in the following reaction?

2S₂O${}_3^{2-}$ + I₂ → S₄O${}_6^{2-}$ + 2I^-

• M₁, M₂

• M₁, M₂ /2

• 2M₁, M₂

• M₁, 2M₂

The normality of 30 volume H₂O₂ is

• 2.678 N

• 5.336 N

• 8.034 N

• 6.685 N

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

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

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

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

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

• 3.45g 

• 3.0g

• 1.36g

• 2.16g

The volume strenght  of 1.5 N H₂O₂ solution is 

• 16.8L

• 8.4L

• 4.2L

• 5.2L

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

Which has the maximum number of molecules among the following?

• 44 g CO₂

• 48 g O₃

• 8g H₂

• 64g SO₂