19quite obviously, ans 1 looks to be (d)...isn't it ?
11Ans 6) When particles are close-packed resulting in either ccp or hcp structure, two types of voids are generated. While the no. of octahedral voids present in a lattice is equals to the no. of colse packed structure, the no. of tetrahedral voids generated is twice this number.
Now, the total no. of tetrahedral voids formed is equals to twice the no. of atoms of element B and only 25 % = (1/4) of these are occupied by the atoms of element A. Hence the ratio of no. of atoms of A and B is 2 X (1/4) = (1/2) and thus the formula of the compound is A B 2.
Ans 8) 74 % ??????
106HCP arrangement ... is the one i have drawn.. This is also FCC (face centred cubic) corner atom is the blue one
24in Q7...whats meaning of FCC corner atom ??
24
eureka123
·2009-12-04 09:51:51
ans6=AB2
tush explain how u got this
ans7=6
24
eureka123
·2009-12-03 23:10:13
thx asish....
@debo..
arre yaar main kya karron..main khud confused hoon in answers mein...
ans1=a,c,d
106
Asish Mahapatra
·2009-12-03 23:08:21
Q4. [1 1 1] means the reciprocal of the intercepts simplified to the lowest ration is (1,1,1) .i.e. the intercepts are (1,1,1)..
So the plane parallel to this plane is x+y+z=c where c is a const..
19
Debotosh..
·2009-12-03 23:07:32
what is that ?
can any of CO2 or SiO2 be ionic ????
....you say its not (c) nor (d)...then its going to be (m) or (n) or.....[4]
24
eureka123
·2009-12-03 23:05:17
@debo
No debo...ans is diff
@asish
i suppose u r answering Q4...
i dont have answer for that ques...can u xplain how ?
24
eureka123
·2009-12-03 22:51:15
@uttara
ans 7 rite...plz explain
and edited Q6,deleted Q3...
@tush,ans 8 is wrong
@saket,ans 1 is wrong
4Diamond ≡ Zns Structure So I think C occupies 1/2
4
UTTARA
·2009-12-03 19:12:13
In silica glass SiO2 exists as a polymer (SiO2)n
11
Tush Watts
·2009-12-03 10:48:26
Oh yeah SORRY [2]
CORRECTED
24
eureka123
·2009-12-03 10:39:39
thx for image...
ans 5 =3 6 1
11
Tush Watts
·2009-12-03 10:32:29
Ans 5) coeff of a,b, and c are 0.5, 0.25 and 1.5
Reciprocal of coeff of a,b and c are 2 , 4 , 2/3
Therefore, multiplying the reciprocal of coefficients of a,b, and c by 3 , we have (6 , 12 , 2)
Hence Miller Indices are (3,6,1) and this face is represented as (3 6 1). [Taking 2 common]
24
eureka123
·2009-12-03 10:23:48
ya its rite...do u have image ??
