1.

A sodium salt of an unknown anionwhentreates with MgCI_(2)gives whiteprecipitate onlyon boling .The anion is

Answer»

`SO_(4)^(2-)`
`HCO_(3)^(Θ)`
`CO_(3)^(2-)`
`NO_(3)^(Θ)`

Solution :It must be a bicarbonate ionbecausefirst magnesiumbeicarbonate isformed which is soluble , then onheating , magnesiumcarbonate is formed which is a insoluble and FORMS a precipitate
`MgCI_(2) + 2NaHCO_(3) RARR underset("soluble")((Mg(HCO_(3))_(2)) + 2NaCI`
`Mg(HCO_(3))_(2) OVERSET(Delta)(to) underset(white)(MgCO_(3) darr) + H_(2)o + co_(2)`


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