I. The reaction between solid copper and aqueous zinc(II) hydroxide (in basic so
ID: 545905 • Letter: I
Question
I. The reaction between solid copper and aqueous zinc(II) hydroxide (in basic solution) produces copper(II) hydroxide (which is insoluble) and something else. For the balanced reaction, which of the following is NOT true?
a. The coefficient of all products and reactants is 1.
b. The state of copper(II) hydroxide product is (s).
c. Copper is the reducing agent.
d. The “something else” is of Zn(aq).
e. The balanced reaction and the net ionic reaction are the same.
II. The reaction between solid copper and aqueous zinc(II) hydroxide (in basic solution) produces copper(II) hydroxide (which is insoluble) and something else is an example of both:
a. a double displacement and an oxidation-reduction reaction.
b. a single displacement and an acid-base reaction.
c. a double displacement and an acid-base reaction.
d. a decomposition and an oxidation-reduction reaction.
e. a single displacement and an oxidation-reduction reaction.
III. The bond between two atoms with a very small difference in electronegativity would be mostly:
a. ionic.
b. polar covalent.
c. non-polar covalent.
d. magic.
e. All of these are correct.
Explanation / Answer
balanced equation : Cu(s) + Zn(OH)2(aq) ----> Cu(OH)2(s) + Zn(s)
i. not true : d. The “something else” is of Zn(aq).
ii. e. a single displacement and an oxidation-reduction reaction.
(Cu incolves in oxidation , Zn^2+ involves in reduction)
iii. c. non-polar covalent. (if difference in electronegativity between 2 atoms < 0.5)