Some properties to differentiate between the minerals include:
Ductility
Malleability
Luster
Particle Size
Ability to react with chemicals
etc....
Answer : The [α] for the solution is, -118.8
Explanation :
Enantiomeric excess : It is defined as the difference between the percentage major enantiomer and the percentage minor enantiomer.
Mathematically,
![\%\text{ Enantiomer excess}=\%\text{ Major enantiomer}-\%\text{ Minor enantiomer}](https://tex.z-dn.net/?f=%5C%25%5Ctext%7B%20Enantiomer%20excess%7D%3D%5C%25%5Ctext%7B%20Major%20enantiomer%7D-%5C%25%5Ctext%7B%20Minor%20enantiomer%7D)
Given:
% major enantiomer = 86 %
% minor enantiomer = 14 %
Putting values in above equation, we get:
![\%\text{ Enantiomer excess}=86\%-14\%=72\%](https://tex.z-dn.net/?f=%5C%25%5Ctext%7B%20Enantiomer%20excess%7D%3D86%5C%25-14%5C%25%3D72%5C%25)
![\text{ Enantiomer excess}=\frac{72}{100}=0.72](https://tex.z-dn.net/?f=%5Ctext%7B%20Enantiomer%20excess%7D%3D%5Cfrac%7B72%7D%7B100%7D%3D0.72)
Now we have to calculate the [α] for the solution.
![[\alpha]=\text{Enantiomer excess}\times [\alpha]_{Pure}](https://tex.z-dn.net/?f=%5B%5Calpha%5D%3D%5Ctext%7BEnantiomer%20excess%7D%5Ctimes%20%5B%5Calpha%5D_%7BPure%7D)
![[\alpha]=0.72\times -165](https://tex.z-dn.net/?f=%5B%5Calpha%5D%3D0.72%5Ctimes%20-165)
![[\alpha]=-118.8](https://tex.z-dn.net/?f=%5B%5Calpha%5D%3D-118.8)
Thus, the [α] for the solution is, -118.8
:
Option (c) is the correct answer.
Explanation:
It is known that when we move down a group then there is increase in size of atom. This is because there occurs increase in number of shells in the atom.
Also, when an atom loses electrons then it acquires a positive charge and size of the atom decreases. On the other hand, when an atom gain electrons then it acquires a negative charge and size of the atom increases.
Since, both Rb and K are same group elements and Rb has larger atomic size than K.
Hence, we can conclude that out of the given options K^{+}
+ has the smallest size.
A solution is acidic if it’s pH is below 7