Haemoglobin Contains 0.33% Of Iron By Weight. The Molecular Weight Of Haemoglobin Is Approximately 67200. The Number Of Iron Atoms (at Wt. Of Fe = 56) Present In One Molecule Of Haemoglobin Is 

One litre of a gas is at a pressure of 10^–6 mm of Hg at 25^oC. How many molecules are present in the vessel?

27 g of Al (at mass = 27) will react with oxygen equal to

2.76 g of silver carbonate (at mass of Ag = 108) on being heated strongly yields a residue weighing 

If 0.5 mol of BaCl₂ is mixed with 0.2 mol of Na₃PO₄, the maximum number of moles of Ba₃(PO₄)₂ that can be formed is

If 10²¹ molecules are removed from 200 mg of CO₂, then the number of moles of CO₂ left are

The  number of gram molecules of oxygen in  molecules is

The molecular weight of O₂ and SO₂ are 32 and 64 respectively. If onelitre of O₂ at 15^oC and 750 mm contains N molecules, the number of molecules in two litres of SO₂ under the same conditions of temperature and pressure will be

Five grams of each of the following gases at 87^oC and 750 mm pressure are taken. Which of them will have the least volume?

In the reaction, 4 NH₃ (g) + 5 O₂ (g) → 4 NO (g) + H₂O (l), when 1 mole of ammonia and 1 mole of O₂ are made to react to completion 

50mL 10 N H₂SO₄, 25mL 12 N HCl and 40 mL 5 N HNO₃ were mixed together and the volume of the mixture was made 1000mL by adding water. The normality of the resultant solution will be :