## Question

### Solution

Correct option is 0.5%  by weight means 0.5 g Se is present in 100 g of peroxidaseanhydrous enzyme. As at least one atom of Se must be present in the enzyme and atomic weight of Se = 78.4, therefore 1 g atom of Se, i.e.,78.4 g will be present in enzyme #### SIMILAR QUESTIONS

Q1

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

Q2

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

Q3

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 :

Q4

The number of atoms in 4.25 g of NH3 is approximately

Q5

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

Q6

One mole of calcium phosphide on reaction with excess of water gives

Q7

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

Q8

The percentage of nitrogen in urea is about

Q9

How much of NaOH is required to neutralize 1500 cm3 of 0.1 N HCl? (Na = 23)

Q10

10 dm3 of N2 gas and 10 dm3 of gas X at the same temperature contain the same number of molecules. The gas X is