07. THE P-BLOCK ELEMENTS (HM)
Explanation:
\(A]\, Na _2 CO _3( s ) \stackrel{\Delta}{\longrightarrow}\) No Reaction
\(B] \,Ag _2 CO _3 \stackrel{\Delta}{\longrightarrow} Ag ( s )+ CO _2( g )\)
\(C] \,Cu _2 CO _3 \stackrel{\Delta}{\longrightarrow} CuO ( s )+ CO _2( g )\)
\(D] \,\left( NH _4\right)_2 CO _3 \stackrel{\Delta}{\longrightarrow} NH _3( g )+ CO _2( g )\)
So, residue is not left in [\(D\)].