Question

Q6. From the list of all the followinng salts choose the salt that most appropriately fits the decription given in the following : [ AgCl, MgCl2 , NaHSO4 , PbCO2 , ZnCO2 , KNO3 , Ca(NO3)2]
(i) A deliquescenet salt.
(ii) An insoluble chloridet f.
(iii) On heating , this salt gives a yellow residue when hot and white when cold.
(iv) On heating this salt, a brown coloured gas is evolved.

Answer 1

Dear Student,

1) MgCl₂- Deliquescent substances are those which absorbs water from the atmosphere and turns into a solution.
2) AgCl - Silver chloride does not dissolve in water
3) ZnCO₃- When zinc carbonate is heated, it releases carbon dioxide and oxygen. A residue of zinc oxide is left behind which is yellow in colour but turns white on cooling.
4) Ca(NO₃)₂- When calcium nitrate is heated, brown coloured gas which is nitrogen oxide is released and the solid calcium oxide is left behind.

Regards,