In which one of the following sets of substances are all members of the set able to undergo a spontaneous redox reaction with pure water?
A - VCE - SSCE Chemistry - Question 8 - 2004 - Paper 1
Question 8
In which one of the following sets of substances are all members of the set able to undergo a spontaneous redox reaction with pure water?
A. Fe, Co²⁺, Cl₂
B. F₂, Mg... show full transcript
Worked Solution & Example Answer:In which one of the following sets of substances are all members of the set able to undergo a spontaneous redox reaction with pure water?
A - VCE - SSCE Chemistry - Question 8 - 2004 - Paper 1
Step 1
A. Fe, Co²⁺, Cl₂
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Answer
Iron (Fe) can react with water under certain conditions, but cobalt(II) ions (Co²⁺) and chlorine gas (Cl₂) do not react spontaneously with water.
Step 2
B. F₂, Mg, Au²⁺
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Answer
Fluorine (F₂) is highly reactive and can react with water. Magnesium (Mg) will react with water, particularly hot water or steam. However, gold(II) ions (Au²⁺) do not have a strong reactivity with water.
Step 3
C. H⁺, Na⁺, Br₂
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Answer
Protons (H⁺) and sodium ions (Na⁺) are stable in water, but bromine (Br₂) does not undergo a redox reaction with water.
Step 4
D. Li, F₂, Ag⁺
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Answer
Lithium (Li) will react with water to produce lithium hydroxide and hydrogen gas. Fluorine (F₂) can react with water, and silver ions (Ag⁺) do not react readily with water. Thus, not all members react spontaneously.
