Identify the external indications in the below chemical reactions 5M
1) Zn + 2HCl (dil) → ZnCl2 + H2 [g]
2) AgNO3 + HCl → HNO3 + AgCl
3) CaO + H2O → Ca (OH)2 +
4) 2HgO (Red) → 2Hg (Silver) + O2[g]
5) NH3 (g) + HCl (g) → NH4Cl (s)
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