From the list of the following salts choose the salt that most appropriately fits the description in the following:
$[AgCl, {MgCl}_{2}, {NaHSO}_{4}, {PbCO}_{3}, {ZnCO}_{3}, {KNO}_{3}, Ca {({NO}_{3})}_{2}]$
(i) On heating this salt gives a yellow residue when hot and white when cold.
(ii) On heating this salt, a brwon-colored gas is evolved.

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Solution

(i) Salt on heating gives a yellow residue when hot and white when cold:
Zinc carbonate $({ZnCO}_{3})$ on heating undergoes a decomposition process to give zinc oxide $(ZnO)$ and carbon dioxide gas $({CO}_{2})$ . In a cold state, Zinc carbonate is a white powdery solid but on heating, it starts to turn yellow and decompose. Thus this process Carbon dioxide gas is evolved, which forms a white precipitate in limewater.
The chemical Reaction is as follows.
$\underset{Zinc carbonate}{{ZnCO}_{3} (s)} \overset{∆}{\to} \underset{Zinc oxide}{ZnO (s)} + \underset{Carbon dioxide gas}{{CO}_{2} (g)}$
(ii) Salt on heating brown-colored gas is evolved:
Calcium nitrate $(Ca {({NO}_{3})}_{2})$ on heating undergoes a decomposition process and leads to the formation of Calcium oxide $(CaO)$ , Nitrogen dioxide $({NO}_{2})$ which is brown color gas, and Oxygen $(O_{2})$
The chemical Reaction is as follows.
$\underset{Calcium nitrate}{2 Ca {({NO}_{3})}_{2} (s)} \overset{∆}{\to} \underset{Calcium oxide}{2 CaO (s)} + \underset{Nitrogen dioxide}{4 {NO}_{2} (g)} + \underset{Oxygen}{O_{2} (g)}$

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Similar questions

From the formula listed below, choose one, in each case, corresponding to the salt having the given description:-

$A g C l, C u C O_{3}, C u S O_{4} .5 H_{2} O, K N O_{3}, N a C l, N a H S O_{4}, P b (N O_{3})_{2} . Z n C O_{3}, Z n C O_{4} .7 H_{2} O .$

(a) an acid salt.

(b) an insoluble chloride.

(d) on heating, this salt changes from green to black.

(e) this salt given nitrogen dioxide on heating.

A white salt on heating decomposes to give brown fumes and a residue is left behind.

From the list of following salts choose the salt that most appropriately fits the descriptions given in the following:

[A g C l, M g C l_{2}, N a H S O_{4}, P b C O_{3}, Z n C O_{3}, K N O_{3}, C a (N O_{3})_{2}]

(i) A deliquescent salt.
(ii) An insoluble chloride
(iii) On heating, this salt gives a yellow residue when hot and white when cold.
(iv) On heating this salt, a brown coloured gas evolved.

Q. 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.

Q1 A white coloured salt 'X' on heating decomposes to give a brown coloured and a colourless gas leaving a white yellow residue . Name the salt 'X' and also write its reaction ?

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From the list of the following salts choose the salt that most appropriately fits the description in the following:[AgCl,MgCl2,NaHSO4,PbCO3,ZnCO3,KNO3,Ca(NO3)2](i) On heating this salt gives a yellow residue when hot and white when cold.(ii) On heating this salt, a brwon-colored gas is evolved.