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

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.

For the reaction,

5 moles of X and 9 moles of Y will produce

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

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

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

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

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

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 

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

One atom of an element weighs  Its atomic mass is