
Which metal bicarbonates do not exist in solid state ?
(i) $LiHC{O_3}$
(ii) $Ca{(HC{O_3})_2}$
(iii) $Zn{(HC{O_3})_2}$
(iv) $NaHC{O_3}$
(v) $AgHC{O_3}$
a.) (i), (iii), (iv)
b.) (i), (ii), (iii)
c.) (i), (ii), (v)
d.) (i), (ii), (iii), (v)
Answer
466.2k+ views
Hint: We all know the trend of the periodic table that only alkali metals form the stable bicarbonates that exist in the solid state. There is an exception to this trend. If an atom has a very small size, then it may be stable in an aqueous state.
Complete Solution :
As we know that in the periodic table, only alkali metals form the stable bicarbonates that exist in a solid state. There is an exception to the above trend also because of size and other properties.
Let us see the options given to us one by one as -
- The first option given to us is $LiHC{O_3}$. The lithium bicarbonate belongs to alkali metals. It is an element of s-block. It should exist in the solid state but it does not do that. It is an exception because it has a very small size compared to other elements. Thus, it has a very high hydration enthalpy. As a result, it is more stable in an aqueous state than in the solid state. So, it could be the correct answer.
- The second option is $Ca{(HC{O_3})_2}$. The Calcium is alkaline earth metal. It belongs to the second group. It is thermodynamically more stable in an aqueous state. So, it exists in an aqueous state. Thus, it can be the correct answer.
- The third option is $Zn{(HC{O_3})_2}$. The Zn like Calcium is alkaline earth metal. It belongs to the second group. It is thermodynamically more stable in an aqueous state. So, it exists in an aqueous state. Thus, it may be the correct answer.
- The fourth option is $NaHC{O_3}$. The Sodium is alkali metal. It belongs to s-belong. It is thermodynamically stable in the solid state. So, it exists in a solid state. Thus, it can not be the correct answer.
- The fifth option is $AgHC{O_3}$. The silver is not alkali metal. It is more stable thermodynamically in aqueous form than in solid form. So, it exists more in an aqueous state. Thus, it can be the answer.
Thus, the correct answer should contain options (i), (ii), (iii) and (v).
So, the correct answer is “Option D”.
Note: It must be noted that bicarbonate is an intermediate formed when carbonic acid is deprotonated. It is isoelectronic with nitric acid. It has a formal charge of -1. It is an amphoteric species that has both acidic and basic properties.
Complete Solution :
As we know that in the periodic table, only alkali metals form the stable bicarbonates that exist in a solid state. There is an exception to the above trend also because of size and other properties.
Let us see the options given to us one by one as -
- The first option given to us is $LiHC{O_3}$. The lithium bicarbonate belongs to alkali metals. It is an element of s-block. It should exist in the solid state but it does not do that. It is an exception because it has a very small size compared to other elements. Thus, it has a very high hydration enthalpy. As a result, it is more stable in an aqueous state than in the solid state. So, it could be the correct answer.
- The second option is $Ca{(HC{O_3})_2}$. The Calcium is alkaline earth metal. It belongs to the second group. It is thermodynamically more stable in an aqueous state. So, it exists in an aqueous state. Thus, it can be the correct answer.
- The third option is $Zn{(HC{O_3})_2}$. The Zn like Calcium is alkaline earth metal. It belongs to the second group. It is thermodynamically more stable in an aqueous state. So, it exists in an aqueous state. Thus, it may be the correct answer.
- The fourth option is $NaHC{O_3}$. The Sodium is alkali metal. It belongs to s-belong. It is thermodynamically stable in the solid state. So, it exists in a solid state. Thus, it can not be the correct answer.
- The fifth option is $AgHC{O_3}$. The silver is not alkali metal. It is more stable thermodynamically in aqueous form than in solid form. So, it exists more in an aqueous state. Thus, it can be the answer.
Thus, the correct answer should contain options (i), (ii), (iii) and (v).
So, the correct answer is “Option D”.
Note: It must be noted that bicarbonate is an intermediate formed when carbonic acid is deprotonated. It is isoelectronic with nitric acid. It has a formal charge of -1. It is an amphoteric species that has both acidic and basic properties.
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