Question

In Kjeldahl’s method, nitrogen present is estimated as :

Solution

Correct option is

NH3

In this method the nitrogen present is quantitatively converted into (NH4)2SO4 on heating with conc. H2SO4. The (NH4)2SO4 is then treated with standard alkali solution to liberate NH3, which is absorbed in H2SO4to obtain percentage of nitrogen.

SIMILAR QUESTIONS

Q1

On heating 0.32 g of an organic compound with concentrated nitric acid and barium chloride, 0.932 g barium sulphate was obtained. Calculate the percentage of sulphur in the given compound.

Q2

6 g of an organic compound containing oxygen is heated with graphite and carbon monoxide formed is quantitatively converted to 8.8 g CO2 on reaction with I2O5. Calculate percentage of oxygen in the compound.

Q3

 

For the reaction,

            

5 moles of X and 9 moles of Y will produce

Q4

The function of boiling the sodium extract with conc. HNO3 before testing for halogen is:

Q5

If 0.5 mole of  is mixed with 0.2 mole of  the maximum number of moles of  that can be formed is

Q6

Sodium nitroprusside when added to an alkaline solution of sulphide ions produces a colouration :

Q7

276 g of silver carbonate on being strongly heated yields a residue weighing

Q8

An organic compound contains 20.0% C, 6.66% H, 47.33% N and the rest was oxygen. Its molar mass is 60 . The molecular formula of the compound is

Q9

 

In the following reaction,

            

2 mol MnO2 reacts with 4 mol of HCl to form 11.2 L  at STP. Thus, per cent yield of  is 

Q10

Two elements X (at. wt. 75) and Y (at. wt.16) combine to give a compound having 75.8% of X. the formula of compound will be