Which of the following pairs of reactants will react together to produce water (h2o) as one of the products? fe(oh)3 and cuo cu(oh)2 and h2s mgo and ca(oh)2 so3 and h2o based on reactivity, which of the following elements can replace aluminum (al) in a compound during a single replacement reaction? b ca zn fe

1. Option (b) is the correct answer.

              2. Option (b) is the correct answer.

Explanation:

1. The reaction between the given reactants will be as follows.

(a)

(b)

(c)

(d)

Thus, out of the given options, the reaction results in the formation of water.

2.  Base on reactivity series, the reactivity of some metals in the decreasing order is as follows.

                  K, Na, Ca, Mg, Al, Zn, Fe

Whereas B is a metalloid so, it will have properties of both metals and non-metals. Thus, boron (B) will also be less reactive than Al.

Therefore, out of the given options, Ca is more reactive than Zn and Fe.

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.