Answer
Verified
405.9k+ views
Hint – In this question use the concept that in $Ca{F_2}$ cations are present at ccp sites and anions are present at tetrahedral voids whereas in $CsCl$ cations are present at corners of cubes and anions are present at the central cubic void. This will help getting the ratio of coordination numbers in the respective fluorite.
Complete answer:
In $Ca{F_2}$ cations are present at ccp sites and anions are present at tetrahedral voids, and coordination number of cations and anions in $Ca{F_2}$ are 8 and 4 respectively.
In $CsCl$ cations are present at corners of cubes and anions are present at the central cubic void, and coordination number of cations and anions in $CsCl$ are 8 and 8 respectively.
So the ratio of cations and anion in $Ca{F_2}$ is (8:4).
And the ratio of cations and anion in $CsCl$ is (8:8).
So this is the required answer.
Hence option (C) is the correct answer.
Note – Calcium fluoride ($Ca{F_2}$) is an (8, 4) structure, meaning that each cation $C{a^{2 + }}$ is surrounded by eight ${F^ - }$anion neighbors, and each ${F^ - }$ anion by four $C{a^{2 + }}$. So coordination numbers of $C{a^{2 + }}$ and ${F^ - }$ ions in $Ca{F_2}$ crystal are 8 and 4 respectively. The formula unit for cesium chloride is CsCl, also a 1:1 ratio or (8: 8) as each Cl − ion is also surrounded by eight $C{s^ + }$ ions.
Complete answer:
In $Ca{F_2}$ cations are present at ccp sites and anions are present at tetrahedral voids, and coordination number of cations and anions in $Ca{F_2}$ are 8 and 4 respectively.
In $CsCl$ cations are present at corners of cubes and anions are present at the central cubic void, and coordination number of cations and anions in $CsCl$ are 8 and 8 respectively.
So the ratio of cations and anion in $Ca{F_2}$ is (8:4).
And the ratio of cations and anion in $CsCl$ is (8:8).
So this is the required answer.
Hence option (C) is the correct answer.
Note – Calcium fluoride ($Ca{F_2}$) is an (8, 4) structure, meaning that each cation $C{a^{2 + }}$ is surrounded by eight ${F^ - }$anion neighbors, and each ${F^ - }$ anion by four $C{a^{2 + }}$. So coordination numbers of $C{a^{2 + }}$ and ${F^ - }$ ions in $Ca{F_2}$ crystal are 8 and 4 respectively. The formula unit for cesium chloride is CsCl, also a 1:1 ratio or (8: 8) as each Cl − ion is also surrounded by eight $C{s^ + }$ ions.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Difference Between Plant Cell and Animal Cell
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
How do you solve x2 11x + 28 0 using the quadratic class 10 maths CBSE
Select the correct plural noun from the given singular class 10 english CBSE
What organs are located on the left side of your body class 11 biology CBSE
The sum of three consecutive multiples of 11 is 363 class 7 maths CBSE
What is the z value for a 90 95 and 99 percent confidence class 11 maths CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
How many squares are there in a chess board A 1296 class 11 maths CBSE