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Subject: Chemistry, asked on 21/4/18

Q. A crystal made of particles A and B . A forms FCC packing and B occupies all the octahedral voids . If all the particles along the plane as shown in figure are removed then the formula of the crystal would be :  (A)  AB  (B)  A5B7  (C) A7B5  (d) none of these 

Subject: Chemistry, asked on 20/4/18

​what is the difference btw annealing and transistion 

Subject: Chemistry, asked on 20/4/18

why transistion cannot b done in ordinary glass

Subject: Chemistry, asked on 20/4/18

What does the interfacial seperation between atoms at the edge means in a bcc latice?
Please explain with the help of diagram of a bcc lattice showing which distance in lattice is referrred here as?

Subject: Chemistry, asked on 18/4/18

The coordinates of the three corners of a shaded face on a cubic unit cell are 12,12,1, 0, 1, 12 and 1, 1, 12 as shown below in the figure. Determine the Miller indices of the plane.

Subject: Chemistry, asked on 18/4/18

Solve this:

Subject: Chemistry, asked on 18/4/18

Q). Diamond has ZnS type. Edge length 100 pm. Calculate bond length of CC bond and effective number of carbon atoms in one unit cell.

Subject: Chemistry, asked on 17/4/18

why mercury doesnot exist as solid in room temperature

Subject: Chemistry, asked on 17/4/18

10g of hydrogen and 64g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be ???
1) 1mol     2) 2mol     3) 3 mol    4) 4 mol.

Subject: Chemistry, asked on 17/4/18

solve no.03 and explain it please.
Q.3. How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl? (Atomic wt. of Pb = 207)
(1) 0.011
(2) 0.029
(3) 0.044
(4) 0.333

Subject: Chemistry, asked on 17/4/18

Solve no.02 and explain it please.
Q.2. Volume occupied by one molecule of water (density = 1 gcm-3) is :-
(1) 3.0×10-23 cm3
(2) 5.5×10-23 cm3
(3) 9.0×10-23 cm3
(4) 6.023×10-23 cm3

Subject: Chemistry, asked on 16/4/18

Solve this:
Q.9. Sodium metal crystallizes in B.C.C. lattice with edge length of 4.29 Å. The radius of sodium atom is
(1) 2.857 Å
(2) 1.601 Å
(3) 2.145 Å
(4) 1.857 Å

Subject: Chemistry, asked on 16/4/18

Solve this:
Q.38. The radii of Na+ and Cl- ions are 95 pm 181 pm respectively. The edge length of NaCl unit cell is
1) 276 pm
2) 138 pm
3) 552 pm
4) 415 pm

Subject: Chemistry, asked on 15/4/18

A compound made up of three particles A,B and C forms a ccp lattice. Ions A are 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 find the formula of the compound ????
No link only answer with explanation.

Subject: Chemistry, asked on 14/4/18

Some of the molecular solids upon heating produces small amount of electricity, hence solid is (1) Piezoelectric (2) Pyroelectric (3) Ferrielectric (4) Ferroelectric Ans given is Pyroelectric...but aren't Peizoelectric solids the ones that produce electricity?

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