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Which of the following demonstrates a double-replacement reaction?

A: Na3PO4 + MnCl2 > Mn3(PO4)2 + NaCl
B: CaCO3 > CaO + CO2
C: 2Mg + O2 > 2MgO
D: 2AgNO3 + Cu > 2Ag + Cu(NO3)2

User COYG
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2 Answers

3 votes
A: Na3PO4 + MnCl2 > Mn3(PO4)2 + NaCl
User Phil Moorhouse
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8.2k points
2 votes

Answer: The correct answer is Option A.

Step-by-step explanation:

For the given options:

Option A:
Na_3PO_4+MnCl_2\rightarrow Mn_3(PO_4)_2+NaCl

This reaction is considered as a double displacement reaction because here exchange of ions takes place.

Option B:
CaCO_3\rightarrow CaO+CO_2

This reaction is considered as a decomposition reaction because here one substance is breaking into two smaller substances.

Option C:
2Mg+O_2\rightarrow 2MgO

This reaction is considered as a synthesis reaction because here two smaller substances are combining in their elemental state to form a single large substance.

Option D:
2AgNO_3+Cu\rightarrow 2Ag+Cu(NO_3)_2

This reaction is considered as a single displacement reaction because here more reactive element displaces a less reactive element from its chemical reaction.

Hence, the correct answer is Option A.

User Fandi Susanto
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