Because it has to be an ionic substance, either by being molten or by being in solution.
When in the 1+ oxidation state, mercury does not occur as a lone Hg+ ion. Instead it forms the polyatomic ion Hg22+. As a result, this ion will bond with two bromide (Br-) ions.
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AgBr2 However, this would be an uncommon compound as silver ions most often occur in the +1 state.
Yes, Aluminum is more electrically active than both zinc and iron. It will become the cathode in the electrochemical reaction.
Rusting will only occur in the presence of both water and oxygen. In the presence of oxygen, water vapour in the air will cause rusting to occur. So unless you are talking about the iron coming into contact with water vapour but when there is no oxygen, the answer is yes.
no
Electrolysis
Because sodium reacts with air (and even more vigorously with water), it does not exist in elemental form on Earth. Its most common form is in salt (sodium chloride), from which it can be extracted by the electrolysis of molten salt.
Any reaction occur.
Any reaction occur.
contact
yes
yes. hydrogen and oxygen gas will be evolved
The planet must have a molten interior
Sodium is a very reactive metal. It doles not occur freely in nature. It is found in the form of its salts like sodium chloride, sodium bromide etc
When in the 1+ oxidation state, mercury does not occur as a lone Hg+ ion. Instead it forms the polyatomic ion Hg22+. As a result, this ion will bond with two bromide (Br-) ions.
it can make new land