Help on chemistry?

Question

Is it A B C D or E

These ?'s are not HW, its suppose to help me for the test, the #'s are going to b different but in the same format. so how do u solve them?

1) it would require ____ ml of 0.300 M hydrochloric acid solution to neutralize 30.0 ml of 0.300M sodium hydroxide solution

A 15,0

B 40.0

C 30.0

D 10.0

E 20.0

2) acid rain is a problem because ___

A it reacts with metals

B it reacts with marble

C it changes the pH of lakes

D none of the above

E all of the above

3) If the oxidation number of an element changes from -1 to +1, the element has been reduced

A true

B false

Thanks a lot :)

Answer 1

1)The neutralization reaction is

HCl + NaOH ------> NaCl + H2O

1 mol HCl neutralizes 1 mol NaOH

Since the molarity(concentration) of both HCl and NaOH solutions are the same, their volumes must also be the same in order for them to neutralze completely. So volume of HCl is 30.0mL. The corect choise is C.

2) E

3)Oxidaton can be defined as the increase in oxidation number, and reduction is the decrease in oxidation number. If the oxidation number of an element changes from -1 to +1, the oxidation number increases from -1 to +1. So the element has been oxidized. The statement is false. Answer is B.

5)

Answer 2

sorry no idea