How many unpaired electrons are in the following complex ions?
1 answer:
Solution :
A complex ion may be defined as a metal ion that is located at the center with other molecules or ions surrounding the center ion.
In the context, the number of the unpaired electrons for the following complex ions are :
1. (low spin)
Here all the d-electrons are paired. Therefore, there are no unpaired electrons.
2. (high spin)
Therefore, it has two unpaired electrons.
3. (high spin)
It has 2 unpaired electrons
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Explanation:
- Evaporation is defined as a process in which liquid state of water is changing into vapor state.
So, we need to break the bonds of liquid substance in order to convert it into vapor state. And, energy is absorbed for breaking of bonds which means that evaporation is an endothermic process.
Hence, the statement evaporation of water is an exothermic process is false.
- When a hydrocarbon reacts with oxygen and leads to the formation of carbon dioxide and water then this type of reaction is known as combustion reaction.
A combustion reaction will always release heat energy. Hence, combustion reaction is exothermic in nature.
- When energy is transferred as heat from the surroundings to the system then it means energy is being absorbed by the system. And, absorption of heat is an endothermic process for which
is positive.
- Whereas when energy is transferred from system to the surrounding then it means energy is released by the system which is an exothermic process.
Hence, for an exothermic process value of is negative.
Thus, we can conclude that statements which are true are as follows.
- A combustion reaction is exothermic.
- When energy is transferred as heat from the system to the surroundings,
- For an endothermic reaction Deta H is positive.