Question

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 

Solution

Correct option is

4

 

SIMILAR QUESTIONS

Q1

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

Q2

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

Q3

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

Q4

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

Q5

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

Q6

The  number of gram molecules of oxygen in  molecules is

Q7

The molecular weight of O2 and SO2 are 32 and 64 respectively. If onelitre of O2 at 15oC 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

Q8

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

Q9

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 

Q10

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 :