Balance copper(ii)sulfate+ammonium sulfide= copper(ii) sulfide + ammonium sulfate

The balanced chemical equation is written below.

Explanation:

Every balanced chemical equation follows law of conservation of mass.

A balanced chemical equation is defined as the equation in which total number of individual atoms on the reactant side is equal to the total number of individual atoms on the product side.

The balanced chemical equation for the reaction of copper (II) sulfate and ammonium sulfide follows:

By Stoichiometry of the reaction:

1 mole of copper (II) sulfate reacts with 1 mole of ammonium sulfide to produce 1 mole of copper (II) sulfide and 1 mole of ammonium sulfate

Hence, the balanced chemical equation is written above.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.