IB myp 4-5 Chemistry – Practice Questions- All Topics
Topic :Types of chemical reaction-Reactivity Series
Topic :Types of chemical reaction-Weightage : 21 %
All Questions for Topic :acids and bases,neutral solutions,acid/base reactions,$\mathrm{pH}$ and indicators,formation of salts,uses of salts,redox reactions,reactivity series,extraction of metals and corrosion,electrochemical cells
Question:
For each of the following word equations, use the reactivity series to decide if the reaction will proceed spontaneously, as written.
a) magnesium + hydrochloric acid ➝ magnesium chloride + hydrogen
b) aluminium + iron(III) oxide ➝ iron + aluminium oxide
c) magnesium oxide + copper ➝ copper(II) oxide + magnesium
d) potassium nitrate + zinc ➝ zinc nitrate + potassium
e) sodium + water ➝ sodium hydroxide + hydrogen
f) iron(III) oxide + carbon ➝ iron + carbon dioxide
▶️Answer/Explanation
Ans: a) Spontaneous
b) Spontaneous
c) Non–spontaneous
d) Non–spontaneous
e) Spontaneous
f) Spontaneous
Question:
Why does gold not react with an acid such as hydrochloric acid?
▶️Answer/Explanation
Ans: Gold will not react with an acid such as hydrochloric acid as gold is the least reactive metal in the series and will not displace hydrogen ions from an acid.
Question:
Why does magnesium replace hydrogen when it reacts with hydrochloric acid?
▶️Answer/Explanation
Ans: Magnesium is higher in the reactivity series than hydrogen.