[meenu]

When compound A is treated with HNO3 , no gas is evolved but the solution has yellow colour. Identift the compound.

1 -  NaCL     2-   KI       3-  Na2CO3        4-   Na2HPO4   5 -  Na2SO4   6 - not any of above
 
I know
     NaCL + HNO3 -------> NaNO3 aq +    HCL gas
     KI  + HNO3 ----->    KNO3 aq  +  HI
 this option is possible but question say  ' no gas is evolved  ' so  how the solution turns yellow. does HI give the yellow color to solution ?
   Na2CO3 + 2HNO3 ----> NaNO3 aq  + H2O (l) + CO2 gas
Na2HPO4 + HNO3------>   NaNO3 aq + H3PO4 aq
                                    i dont know color of resulting solution
  Na2SO4 + HNO3   ------->NaNO3 aq  +  H2SO4 aq
                                 again i dont know color of solution
 
or the answer is not any of above mentioned compounds


 

[Arkcon]

OK, try to look at the products, if they're the same every time (most of the time,) and you're looking for a yellow color, would this reaction work to differentiate them?  Afterward, you will have to look up some of these compounds, to see what color they give in solution.

[AWK]

HI is a strong reductor, HNO3 is an oxidizer

[firedamage]

HNO3 act as an oxidizer?what is an oxidizer?

[Adamcp898]

HNO3 act as an oxidizer?what is an oxidizer?

An oxidizer or oxidzing agent is the chemical that is reduced in a redox reaction, i.e. it gains electrons

[firedamage]

Na2HPO4 + HNO3------>   NaNO3 aq + H3PO4 aq(colourless solution)
                                   
  Na2SO4 + HNO3   ------->NaNO3 aq  +  H2SO4 aq(colouless solution)