Mole Concept Quiz 8 – Punjab Meritorious School Preparation Portal

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An aqueous solution of 6.3 g oxalic acid dihydrate is made up to 250 mL. The volume of 0.1 N NaOH required to completely neutralised 10 mL of this solution is:

40 mL

20 mL

10 mL

4 mL

In a compound C, H, N atoms are present in 9 : 1 : 3.5 by weight. Molecular weight of compound is 108, its molecular formula is:

The amount of oxalic acid (hydrated) required to prepare 500 mL of its 0.1 N solution is:

0.315 g

6.3 g

3.15 g

63.0 g

Which of the followings changes with increase in temperature?

Molality

Weight fraction of solute

Fraction of solute present in water

Mole fraction

The number of atoms in 558.5 g of Fe (at.wt. 55.85) is:

5.85 g of NaCl dissolved in H₂O and solution is made upto 500 mL. The molarity is:

0.1

0.2

1.0

0.117

The normality of 0.3 M phosphorous acid (H₃PO₃) is:

0.1

0.9

0.3

0.6

How many moles of electrons weigh one kilogram?

The least number of molecules are contained in :

2 g hydrogen

8 g oxygen

4 g nitrogen

16 g CO2

What volume of H₂ at 273 K and 1 atm will be consumed in obtaining 21.6 g of elemental boron (at. mass 10.8) from the reduction of boron trichloride with H₂?

44.8 L

22:4L

89.6 L

67.2 L

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