QuestionApril 14, 2026

Which of the following is not a synthesis reaction? a Mg+2HClarrow MgCl_(2)+H_(2) b 2CO+O_(2)arrow 2CO_(2) C 3H_(2)+N_(2)arrow 2NH_(3) d 2H_(2)+O_(2)arrow 2H_(2)O

Which of the following is not a synthesis reaction? a Mg+2HClarrow MgCl_(2)+H_(2) b 2CO+O_(2)arrow 2CO_(2) C 3H_(2)+N_(2)arrow 2NH_(3) d 2H_(2)+O_(2)arrow 2H_(2)O
Which of the following is not a synthesis reaction? a Mg+2HClarrow MgCl_(2)+H_(2) b 2CO+O_(2)arrow 2CO_(2) C 3H_(2)+N_(2)arrow 2NH_(3) d 2H_(2)+O_(2)arrow 2H_(2)O

Solution
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Answer

a Mg + 2HCl \rightarrow MgCl_{2} + H_{2} Explanation 1. Identify synthesis reaction definition Synthesis reaction: two or more reactants combine to form one product. 2. Analyze each option a: Mg + 2HCl \rightarrow MgCl_{2} + H_{2} → metal + acid → salt + hydrogen gas; this is a single displacement, not synthesis. b: 2CO + O_{2} \rightarrow 2CO_{2} → two reactants → one product → synthesis. c: 3H_{2} + N_{2} \rightarrow 2NH_{3} → synthesis. d: 2H_{2} + O_{2} \rightarrow 2H_{2}O → synthesis.

Explanation

1. Identify synthesis reaction definition <br /> Synthesis reaction: two or more reactants combine to form one product. <br /><br />2. Analyze each option <br /> a: $Mg + 2HCl \rightarrow MgCl_{2} + H_{2}$ → metal + acid → salt + hydrogen gas; this is a single displacement, not synthesis. <br /> b: $2CO + O_{2} \rightarrow 2CO_{2}$ → two reactants → one product → synthesis. <br /> c: $3H_{2} + N_{2} \rightarrow 2NH_{3}$ → synthesis. <br /> d: $2H_{2} + O_{2} \rightarrow 2H_{2}O$ → synthesis.
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