Question

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

Solution

Correct option is

 

Element

Percentage

At. wt.

  Moles

Simplest

  ratio

    X

    Y

    75.8

    24.2

   75

   16

  

   

    2

    3

∴ The formula of the compound is 

SIMILAR QUESTIONS

Q1

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

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

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

Q8

 

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 

Q9

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

Q10

One atom of an element weighs  Its atomic mass is