Solid State
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New answer posted
2 months agoContributor-Level 10
For the dissociation of K? [Fe (CN)? ]? 4K? + [Fe (CN)? ]? , the number of ions produced (n) is 5.
The degree of dissociation (α) is related to the van't Hoff factor (i) by α = (i-1)/ (n-1).
Given α = 0.4: 0.4 = (i - 1) / (5 - 1) => 1.6 = I - 1 => I = 2.6
Using the depression in freezing point formula (ΔTf = i·Kf·m), and equating the ΔTf for two different solutions:
ΔTf (K? [Fe (CN)? ]) = ΔTf (A)
i? ·Kf·m? = i? ·Kf·m?
(2.6) * [ (18.1 / M) / (100-18.1)/1000] = (1) * [ (w? /M? ) / (W? /1000)]
The problem simplifies to finding the molar mass M of solute A:
2.6 * [18.1 / (M * 81.9)] * 1000 = [w? /M? ] * [1000/W? ]
Assuming the secon
New answer posted
2 months agoContributor-Level 10
ρ = M/V
∴ 6.17 = (2 x MX? ) / (N? x (300 x 10? ¹? )³)
Solving MX? = 50 g
∴ No. of molecules in 200 g
= (200/50) x N? = 4 N?
New answer posted
2 months agoContributor-Level 10
In the ccp lattice of oxide ions effective number of O? ² ions = 8 *? + 6 * ½ = 4
In the ccp lattice,
No. of octahedral voids = 4
No. of tetrahedral voids = 8
Given M? atoms occupies 50% of octahedral voids and M? atoms occupies 12.5 of tetrahedral voids
No. of M? metal atoms = 4 *? /? = 2
No. of M? metal atoms = 8 * ¹²·? /? = 1
∴ Formula of the compound = (M? )? (M? )O?
∴ Oxidation states of metals M? & M? respectively are +2 and +4 .
New answer posted
2 months agoContributor-Level 9
For AB? compound possible geometry are
S. No. | Bond pair | Lone pair | Total | Hybridisation | Geometry | Polarity |
1 | 4 | 0 | 4 |
| Tetrahedral | non polar |
2 | 4 | 1 | 5 |
| Sea-saw | Polar |
3 | 4 | 2 | 6 |
| Square Planar | non polar |
Square pyramidal can be polar due to lone pair moment as the bond pair moments will get cancelled out.
New answer posted
2 months agoContributor-Level 10
In FCC octahedral voids are present at the edge centers and body center
Consider a diagonal projected form edge centre passing through the body centre
Distance between octahedral voids = √2a/2 = a/√2
New answer posted
2 months agoContributor-Level 10
In Monoclinic crystal system, a ≠ b ≠ c and α = 90°, γ = 90° and β=120°.
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