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Nirav
Subject: Chemistry
, asked on 14/4/18
On applying high pressure 6:6 coordination of NaCl structure changes to 8:8 coordinaton of CsCl structure and on supplying heat coordination of CsCl type changes to that of NaCl type. Will this be considered as a defect? Explain.
Answer
1
Ipsita Dash
Subject: Chemistry
, asked on 14/4/18
A compound made upof particles A,B and C forms ccp lattice. Ions A at lattice points, B occupy tetrahedral voids and C occupy octahedral voids. If all the ions along one of the edge axis are removed, then the formula of the compound is ?????
Explain this and please don't send any link.
Answer
1
Arpita Dua
Subject: Chemistry
, asked on 13/4/18
schottky defect is present when difference in size of cation and anion is small or large
Answer
2
Alok Singh
Subject: Chemistry
, asked on 12/4/18
Please solve this one.
Q.5. In a sample of hard water supplied in homes, the degree of hardness was determined to be 65 ppm. After analysis of the sample it was found that the hardness was entirely due to
$MgS{O}_{4}$
. Calculate the amount of
$MgS{O}_{4}$
present in 15 L of supplied water. Given density of water: 1 g/
$c{m}^{3}$
.
A. 1.11 g
B. 1.14 g
C. 1.17 g
D. 1.20 g
Answer
1
Alok Singh
Subject: Chemistry
, asked on 12/4/18
Please solve these:
Q. Sodium crystallises in a g/cc arrangement with interfacial separation between the atoms at the edge length is 53 pm. The density of solid is:
(A) 1.23 g/cc (B) 485 g/cc
(C) 4.85 g/cc (D) 123 g/cc
Answer
5
Sonia Ghodke
Subject: Chemistry
, asked on 12/4/18
Atoms A, B, C and D are present at corners, face centres, body centres and edge centres resp. in a cubic unit cell. If the atoms touching one of the 2-fold, 3-fold and 4-fold axis of symmetry are removed, then formula of compound is_____?
Answer
1
Shreya Choudhary
Subject: Chemistry
, asked on 11/4/18
Solve this:
Q. In a face-centred cubic lattice, by how many unit cells is a unit cell shared equally?
(A) 8
(B) 4
(C) 2
(D) 6
Answer
3
Sanjukta Biswas
Subject: Chemistry
, asked on 10/4/18
What is the difference between quartz and quartz glass?
Answer
1
Hrushikesh Badgujar
Subject: Chemistry
, asked on 9/4/18
A metallic element exists in simple cubic structure.Each edge length of unit cell is 3A^0. The density of a metal is 10 gm/cm^3. How many unit cells will be there in 16.2 gm of metal?
Answer
2
Hrushikesh Badgujar
Subject: Chemistry
, asked on 9/4/18
Q. A metallic element exists in simple cubic structure. Each edge length of the unit cell is 3
${A}^{0}$
.The density of metal is 10 gm
$c{m}^{-3}$
. How many unit cells will be there in 16.2 gm of the metal?
(A) 16 x
${10}^{22}$
(B) 16 x
${10}^{31}$
(C) 28
(D) 42
Answer
1
Hrushikesh Badgujar
Subject: Chemistry
, asked on 9/4/18
Q.No.24
Q24. Ar crystallizes in a F.C.C lattice one atom at each lattice point, If the edge length is 5.311A° at OK, the distance between nearest neighbouring atoms in Ar at 'O'K is
(A) 3. 755A° (B) 7.355 A° (C) 5.735 A° (D) 1.877 A°
Answer
2
Royel Ghost
Subject: Chemistry
, asked on 9/4/18
pls solve QUESTION number 8..:
8. Lithium borohydride crystallizes in an orthorhombic system with 4-molecules per unit cell the unit cell of dimension are a=6.8A
^{o}
, b=4.4A
^{o}
and c=7.2A
^{o}
. If the molar mass in 21.54 calculate the density of the crystal.
Answer
1
Royel Ghost
Subject: Chemistry
, asked on 9/4/18
Solve this:
10. Metallic gold crystallizes in the face centred cubic lattice. The edge length of the cubic unit cell , a=4A
^{o}
. Calculate the closest distance between gold atom and the density of gold. (Ans=197 amu).
11. Niobium crystallises in a body-centred cubic (bcc) structure. If the density is 8.55gcm-
^{3}
, calculate the atomic radius of niobium. (Nb=93 amu)
12. The radius of Zn++ ion is 74pm and that of S2- is 190pm. then find C.N and structure.
Answer
1
Shreya Choudhary
Subject: Chemistry
, asked on 8/4/18
Solve this:
37. Select the graph that correctly represents an equilibrium whose K
_{p}
> 1
Answer
1
Nura Mohammad
Subject: Chemistry
, asked on 7/4/18
The structure of amorphous solids is similar to that of liquids justify
Answer
1
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Explain this and please don't send any link.

Q.5. In a sample of hard water supplied in homes, the degree of hardness was determined to be 65 ppm. After analysis of the sample it was found that the hardness was entirely due to $MgS{O}_{4}$. Calculate the amount of $MgS{O}_{4}$ present in 15 L of supplied water. Given density of water: 1 g/$c{m}^{3}$.

A. 1.11 g

B. 1.14 g

C. 1.17 g

D. 1.20 g

Q. Sodium crystallises in a g/cc arrangement with interfacial separation between the atoms at the edge length is 53 pm. The density of solid is:

(A) 1.23 g/cc (B) 485 g/cc

(C) 4.85 g/cc (D) 123 g/cc

Q. In a face-centred cubic lattice, by how many unit cells is a unit cell shared equally?

(A) 8

(B) 4

(C) 2

(D) 6

(A) 16 x ${10}^{22}$

(B) 16 x ${10}^{31}$

(C) 28

(D) 42

Q24. Ar crystallizes in a F.C.C lattice one atom at each lattice point, If the edge length is 5.311A° at OK, the distance between nearest neighbouring atoms in Ar at 'O'K is

(A) 3. 755A° (B) 7.355 A° (C) 5.735 A° (D) 1.877 A°

8. Lithium borohydride crystallizes in an orthorhombic system with 4-molecules per unit cell the unit cell of dimension are a=6.8A

^{o}, b=4.4A^{o}and c=7.2A^{o}. If the molar mass in 21.54 calculate the density of the crystal.10. Metallic gold crystallizes in the face centred cubic lattice. The edge length of the cubic unit cell , a=4A

^{o}. Calculate the closest distance between gold atom and the density of gold. (Ans=197 amu).11. Niobium crystallises in a body-centred cubic (bcc) structure. If the density is 8.55gcm-

^{3}, calculate the atomic radius of niobium. (Nb=93 amu)12. The radius of Zn++ ion is 74pm and that of S2- is 190pm. then find C.N and structure.

37. Select the graph that correctly represents an equilibrium whose K

_{p}> 1