A Problem on Salt Analysis!

Chemistry Level 4

A colourless salt $(A)$ ,soluble in water,gives a mixture of three gases $(B),(C),(D)$ along with water vapours. $(C)$ is not oxidisable. $(B)$ turns red litmus blue, $(C)$ turns blue litmus red and gas $(D)$ is neutral towards litmus paper. Gas $(B)$ is also obtained when $(A)$ is heated with $\ce{NaOH}$ and gives brown ppt with $\ce{{K}_{2}Hg{I}_{4}}$ . Solution thus obtained gives white ppt $(E)$ with $\ce{Ca{Cl}_{2}}$ solution in presence of $\ce{C{H}_{3}COOH }$ . $(E)$ decolourises $\ce{{Mn{O}_{4}}^{-}/{H}^{+}}$ . Gas $(C)$ turns lime water milky while gas $(D)$ burns with blue flame and is fatal when inhaled. Find the molecular mass of salt $(A)$ .

Two more problems on Salt Analysis are as follows:

A Problem on Salt Analysis! 2
A Problem on Salt Analysis! 3

The answer is 124.

1 solution

Nitish Joshi
Apr 19, 2016

The compounds are:

$A$ : $(NH_4)_2C_2O_4$

$B$ : $NH_3$

$C$ : $CO_2$

$D$ : $CO$

$E$ : $CaC_2O_4$

I still can't figure out why the colour of compound C is given as red though.

Yes correct. And $C{O}_{2}$ is acidic in nature, so it gives red colour in litmus paper test.

Saarthak Marathe - 5 years, 1 month ago

It would be good if you can edit the problem statement a little bit. What I thought you meant to say was that the colour of compound C is red.

Nitish Joshi - 5 years, 1 month ago

Ok. I'll edit the problem statement

Saarthak Marathe - 5 years, 1 month ago

@Saarthak Marathe – A good problem, but should it not be mentioned when the three gases are produced?

Milind Blaze - 5 years, 1 month ago

You should clarify that C is non oxidizable
Otherwise it can be inferred as SO2 also .

AYUSH JAIN - 4 years, 10 months ago

Thank you very much

Saarthak Marathe - 4 years, 10 months ago

A Problem on Salt Analysis!

The answer is 124.

1 solution

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