What happens when Na2Co3 is heated at 300K and above 300K? Give equations
Answers
Explanation:
When ammonium dichromate is heated, it gives nitrogen gas, green residue of chromium trioxide and water.
(NH
4
)
2
Cr
2
O
7
heat
N
2
+Cr
2
O
3
+4H
2
O
When ammonium dichromate is heated with NaOH, ammonia gas is obtained which reacts with HCL to form white fumes of ammonium chloride.
(NH
4
)
2
Cr
2
O
7
+2NaOH→2NH
3
+Na
2
Cr
2
O
7
+2H
2
O
NH
3
+HCl→NH
4
Cl
When nitrogen is heated with aluminum, aluminum nitride is obtaned.
N
2
+2Al
heat
2AlN
AlN on hydrolysis forms aluminum hydroxide and releases ammonia gas.
AlN+3H
2
O→Al(OH)
3
+NH
3
Chromium oxide on acidification with conc. HCl forms Chromium(III) chloride.
Cr
2
O
3
+6HCl→2CrCl
3
+3H
2
O
Chromium(III) chloride on oxidation with alkaline hydrogen peroxide forms yellow sodium chromate.
CrCl
3
+2NaOH+H
2
O
2
→Na
2
CrO
4
+3HCl
Sodium chromate reacts with lead acetate in presence of acetic acid to form lead chromat which is also yellow in colour.
Na
2
CrO
4
+Pb(CH
3
COO)
2
CH
3
COOH
PbCrO
4