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Nithyashrri Saravanan
Subject: Chemistry
, asked on 8/3/18
Dear.experts in question2.(ii) when se calculate we get a=564pm and then we divide by 2 to get the distance between the ions but why cant we use the formula r=a/root2 which is the distance between nearest neighbour in fcc ? When do we use this formula then? NO LINKS PLS
Q2. (i) What are intrinsic semiconductors? Give an example.
(ii) What is the distance between Na
+
and Cl¯ ions in NaCl crystal if its density is 2.165 g cm
–3
?
[ Atomic Mass of Na = 23u, Cl = 35.5 u; Avogadro's number = 6.023× 10
23
]
Answer
1
Nithyashrri Saravanan
Subject: Chemistry
, asked on 7/3/18
Account for: Dielectric properties of BaTiO3 and PbZrO3 are different.
Answer
1
Nithyashrri Saravanan
Subject: Chemistry
, asked on 7/3/18
On what important factor the formation of interstitial depends?
Answer
1
Nithyashrri Saravanan
Subject: Chemistry
, asked on 7/3/18
Which stoichiometric defect is observed in solids with high co-ordination number.
Answer
2
Nithyashrri Saravanan
Subject: Chemistry
, asked on 7/3/18
KBr has a rock salt type structure.what is the coordination number of K^+ and Br- in KBr. Is there a formula. How do we know. Should we memorise.
Answer
1
Nithyashrri Saravanan
Subject: Chemistry
, asked on 7/3/18
What are the componentsof magnetic moment of an electron?
Answer
1
Nithyashrri Saravanan
Subject: Chemistry
, asked on 7/3/18
What is a photovoltaic cell and a photo diode?
Answer
1
Nithyashrri Saravanan
Subject: Chemistry
, asked on 7/3/18
Dear experts how is the coordination no of each ion found out here. Is there a method to know them? Or do we havr to memorise
Answer
1
Shreya Choudhary
Subject: Chemistry
, asked on 6/3/18
Q.Explain the meaning of angular node. As well.as how angular node of 3dz2 is zero thoudh l for d =2
15. A : The number of angular nodes in
3
d
z
2
is zero.
R : Number of angular nodes of atomic orbitals is equal to value of l.
Answer
1
Aishwarya Trivedi
Subject: Chemistry
, asked on 1/3/18
please answer the ques encircled
Q1. Radii of A
+
and that of X
–
and Y
–
have been given as
A
+
= 1.00 pm
X
–
= 1.00 pm
Y
–
= 2.00 pm
Assign structure of AX and AY crystals and also determine the volume of unit cells of AX and AY crystals.
Ans. Volume (a
3
) = 216 pm
3
Answer
1
Chaitanya Kapoor
Subject: Chemistry
, asked on 25/2/18
B PART 1ST N 2ND
Q.(b) Give reasons:
(i) In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.
(ii) Silicon on doping with Phosphorous forms n-type semiconductor.
Answer
2
Chaitanya Kapoor
Subject: Chemistry
, asked on 25/2/18
25th A PART
Q.25. (a) An element has atomic mass 93 g
m
o
l
-
1
and density 11. 5 g
c
m
-
3
. If the edge length of its unit cell is 300 pm, identify the type of unit cell.
Answer
1
Kurian J
Subject: Chemistry
, asked on 23/2/18
What is the easiest and best way to study chemistry ??
Answer
1
Shivam Sharma
Subject: Chemistry
, asked on 23/2/18
Q. How can we find the cube roots of such numbers? Will these be provided to us in the qn?
a
3
=
4
.
71
×
10
-
23
c
m
3
⇒
a
=
4
.
71
×
10
-
23
c
m
=
3
.
6
×
10
-
8
c
m
Answer
3
Alifa
Subject: Chemistry
, asked on 20/2/18
In a compound XY, which crystallizes in cubic structure. Y occupies the corners and X the centre of the cube. If one Y^- from corner is replaced by a Z^-, what is the simplest formula of resulting compound?
Answer
2
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What are you looking for?
Q2. (i) What are intrinsic semiconductors? Give an example.
(ii) What is the distance between Na+ and Cl¯ ions in NaCl crystal if its density is 2.165 g cm–3?
[ Atomic Mass of Na = 23u, Cl = 35.5 u; Avogadro's number = 6.023× 1023]
15. A : The number of angular nodes in is zero.
R : Number of angular nodes of atomic orbitals is equal to value of l.
Q1. Radii of A+ and that of X– and Y– have been given as
A+ = 1.00 pm
X– = 1.00 pm
Y– = 2.00 pm
Assign structure of AX and AY crystals and also determine the volume of unit cells of AX and AY crystals.
Ans. Volume (a3 ) = 216 pm3
Q.(b) Give reasons:
(i) In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.
(ii) Silicon on doping with Phosphorous forms n-type semiconductor.
Q.25. (a) An element has atomic mass 93 g and density 11. 5 g . If the edge length of its unit cell is 300 pm, identify the type of unit cell.