A Sample Contains MgNH₄(PO₄)₂, Sb₂S₃,KBr,Cr(OH)₃,and PbCl₂

question 111

Multiple Choice

A sample contains MgNH₄(PO₄) ₂, Sb₂S₃,KBr,Cr(OH) ₃,and PbCl₂.Identify the precipitate after the addition of 6 M HCl; then H₂S and 0.2 M HCl; then OH^- to a pH of 8; and then (NH₄) ₂HPO₄ with NH₃.

• A) MgNH₄(PO₄)₂
• B) Sb₂S₃
• C) KBr
• D) Cr(OH)₃
• E) PbCl₂

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