Question

4. a) A white salt on heating decomposes to give brown fumes and a residue is
left behind.
(1) Name the salt.
(ii) Write the equation for the decomposition reaction.
(b) Which of the following statements is correct and why copper can displace silver from
silver nitrate and silver can displace copper from copper sulphate solution.​

Answer 1

Answer:

The given white salt is lead nitrate Pb(NO

3

)

2

It decomposes to give brown fumes(NO

2

) and yellow residue(PbO). The reaction can be given as follows:

2Pb(NO

3

)

2

→2PbO+4NO

2

+O

2

December 20, 2019

Answer 2

Answer:

a) (i) LEAD NITRATE [Pb(NO3)2]

(ii) EQUATION  :   2Pb(NO3)2(S) ----HEAT----> 2Pbo(S)+4NO2(G)+O2(G)

b)Copper can displace silver from silver nitrate is a correct statement because copper is more reactive than silver and lies above silver in reactivity series.

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