A metal nitrate “ A" on heating gives yellow / brown residue along with the evolution of a brown gas “B” and a colourless gas “ C”. Aqueous solution of “A” on heating with potassium iodide forms a yellow precipitate of compound “D”. Identify A , B, C, D.
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CHEMISTRY
A metal nitrate A on heating gives yellowish brown coloured metal oxide along with brown gas B and a colourless gas C. An aqueous solution of A on reaction with potassium iodide forms a yellow precipitate of compound D. Identify A, B, C and D. Also, identify the types of reactions taking place. Metal present in A is used in an alloy which is used for soldering purposes.
December 20, 2019
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The metal nitrate (A) is lead nitrate (Pb(NO
3
)
2
) on heating it produces lead oxide, Nitrogen dioxide (B) and oxygen gas (C)
(1) 2Pb(NO
3
)
2
→2PbO+4NO
2
+O
2
on reaction with potassium iodide mixture of lead iodide and potassium nitrate forms
(2) Pb(NO
3
)
2
+2KI→PbO
2
+2kNO
3
Alloy made of using lead is used in Soldering purpose.
Therefore A=[Pb(NO
3
)
2
),B=NO
2
C=O
2
D=PbI+KNO
3
(2) Decompostion type Reaction
(2) Double displacement type Reaction.