Respuesta :

We can use any solution containing chloride ions as NaCl solution or even dilute HCl due to mercurous Hg₂²⁺ is from group I cations which precipitated as chloride while Sr²⁺ is from group V 
Net ionic equation:
Hg₂²⁺ + 2 Cl⁻  → Hg₂Cl₂ (white precipitate)
while SrCl₂ is soluble salt
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