which of the following is not a double - replacement reaction? a ni(no3)2 + naoh → nano3 + ni(oh) b zn +…

which of the following is not a double - replacement reaction? a ni(no3)2 + naoh → nano3 + ni(oh) b zn + cu(ch3coo)2 → zn(ch3coo)2 + c hi + ba(oh)2 → bai2 + h2o d nh4cl + koh → kcl + nh3 + h2o

which of the following is not a double - replacement reaction? a ni(no3)2 + naoh → nano3 + ni(oh) b zn + cu(ch3coo)2 → zn(ch3coo)2 + c hi + ba(oh)2 → bai2 + h2o d nh4cl + koh → kcl + nh3 + h2o

Answer

Explanation:

Step1: Recall double - replacement reaction definition

A double - replacement reaction has the general form (AB + CD\rightarrow AD+CB), where two compounds exchange ions.

Step2: Analyze option a

(Ni(NO_3)_2+NaOH\rightarrow NaNO_3 + Ni(OH)_2) (balanced: (Ni(NO_3)_2 + 2NaOH\rightarrow 2NaNO_3+Ni(OH)_2)) is a double - replacement reaction as the nitrate and hydroxide ions are exchanged.

Step3: Analyze option b

(Zn + Cu(CH_3COO)_2\rightarrow Zn(CH_3COO)_2+Cu) is a single - replacement reaction. Here, zinc replaces copper in the copper acetate compound. A single - replacement reaction has the form (A + BC\rightarrow AC + B).

Step4: Analyze option c

(HI+Ba(OH)_2\rightarrow BaI_2 + H_2O) (balanced: (2HI + Ba(OH)_2\rightarrow BaI_2+2H_2O)) is a double - replacement reaction. The hydrogen and barium ions exchange places.

Step5: Analyze option d

(NH_4Cl+KOH\rightarrow KCl + NH_3+H_2O) is a double - replacement reaction where the ammonium and potassium ions exchange places and ammonia and water are formed as products due to the decomposition of ammonium hydroxide.

Answer:

B. (Zn + Cu(CH_3COO)_2\rightarrow Zn(CH_3COO)_2+Cu)