One Mole Of Calcium phosphide on Reaction With Excess Of Water Gives

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?

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 

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 : 

The number of atoms in 4.25 g of NH₃ is approximately

A 100mL solution of 0.1 N HCl was titrated with 0.2 N NaOH solution. The titration was discontinued after adding 30mL of NaOH solution. The remaining titration was completed by adding 0.25 N KOH solution. The volume of KOH required for completing the titration is 

Number of g of oxygen in 32.2 g Na₂SO₄. 10H₂O is

The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight = 78.4). Then minimum molecular weight of peroxidaseanhydrous enzyme is

 The percentage of nitrogen in urea is about