1.

Compound X is tested and the results are shown in the table : Which ions are present in compound X?

Answer»

Ammonium ions and sulphite ions
Ammonium ions and carbonate ions
Sodium ions and carbonate ions
Ammonium ions and sulphate ions.

Solution :In the first test , in PRESENCE of alkali , a gas with basic nature is evolved . This is possible with `overset(+)(N)H_(4)` salts .
`overset(+)(N)H_(4) + NaOH_((aq)) overset(Delta)(to) NH_(3) + H_(2)O + Na^(+)`
For the second test , effervescence and turning lime water milky GENERALLY gives the IDEA of two gases : `CO_(2)` and `SO_(2)` . But as the gas turns acidified `K_2 Cr_2 O_7` PAPER green so the gas should be `SO_2` . Sulphite salts on reaction with dil. HCl evolves `SO_(2)` .
`K_(2) underset("(orange)")(Cr_(2) O_(7)) + SO_(2) + H_(2) SO_(4) to underset("(green)") (Cr_(2) (SO_(4))_(3)) + K_(2) SO_(4) + H_(2)O`


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