Answers Chemistry Reactions in Aqueous Solutions — QuizQuestion 22

22

QuizMultiple Choice

Reactions in Aqueous Solutions — Quiz

Question 22 • Chemistry

Which formula represents a double displacement reaction?

Answer

A

Pb open paren NO sub 3 close paren sub 2 aq plus 2 HCl aq rightarrow 2 HNO sub 3 aq plus PbCl sub 2 times s

B

Zn times s plus 2 HCl aq rightarrow ZnCl sub 2 times aq plus cap h sub 2 of g

C

Ca OH sub 2 s rightarrow CaO times s plus cap h sub 2 cap o g

D

cap c sub 2 cap h sub 5 OH l plus cap o sub 2 times g rightarrow CO sub 2 times g plus cap h sub 2 cap o g

Explanation

A double displacement reaction occurs when two compounds exchange ions to form two new compounds. In A, lead nitrate and hydrochloric acid exchange ions, producing nitric acid and lead chloride. Choice C is a single-displacement reaction, while B is combustion and D is decomposition.

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