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Q. Number of 90degree angle in PCl5 is

Q. 37. A crystalline solid ab has nacl type structure with b having radius. 250 pm. Which of following cation can be made slip into tetrahedral site of Crystal AB.? A. P (radius 180pm) B. Radius 56 pm. C. Radius 200pm D. Radius 150pm

Q.

Which has more lattice energy? NaF or NaCl.

1. 

2. Data Insufficient

3. 

4. Same

Q. The difference between the value of Cp of H2 and the Cv of He will be

Q. Total number of voids per unit cell if a metal crystallises into hcp is (1) 4 (2) 12 (3)18 (4) 8

Q. in a hexagonal closest packing in two layers one above the other the coordeination number of each sphere wil b

Q. 28. Maximum possible numbers of two and three dimensional lattices are respectively 1) 5 and 14 2) 7 and 14 3) 14 and 4 4) 5 and 13

Q. 37. How to find maximum possible no. Of two dimensional lattice and 3 dimensional lattice

Q. what is the shape of CCl3-

Q. What is hcp and ccp?

Q. how many monochlorostructural product is formed in CH3-CH(CH3)CH2-CH3

Q. what is NTP and STP

Q. Calculate the amount of 90 percent H2SO4 required for the preparation of 420 kg HCl as per te following equation 2NaCl+H2SO4→ Na2SO4+2HC

Q. What is difference in between Torsional strain , angle strain and steric strain?

Q. 42. Explain (i) The basis of similarities and differences between metallic and ionic crystals. (ii) Ionic solids are hard and brittle.

Q. How much should the pressure be increased in order to decreased the volume of a gas by 5% at a constant temperature? 1)5% 2) 5.26% 3)10% 4)4.26% Explain briefly

Q.

How many number of atoms are present in each unit cell in ccp structure?

Q.

The distance between an octahedral and tetrahedral void in fcc lattice would be

1. $\frac{\mathrm{a}}{\sqrt{3}}$

2. $\mathrm{a}\sqrt{3}$

3. $\frac{\mathrm{a}\sqrt{3}}{2}$

4. $\frac{\mathrm{a}\sqrt{3}}{4}$

Q. The ratio of the distances with the nearest neighbours in a body centered cubic (BCC) and a face centered cubic (FCC) crystals with the same unit cell edge length is:

1. $\sqrt{\frac{3}{2}}$
2. $\frac{\sqrt{3}}{2}$
3. $\frac{1}{\sqrt{2}}$
4. $\frac{1}{2}$

Q. What is Mercks method?

Q. 16.find the percentage of ionic character of HCl givent that observed dipole moment is 1.30D and bond lenghth is 1.275 Angstrom

Q. what is fajans rule ?

Q. Q. What is path function

Q.

How many unit cells are present in a cubic -shaped ideal crystal of NaCl of mass 1.00 g [Atomic masses: Na= 23, Cl = 35.5]

1. $2.57\times {10}^{21}$ unit cells

2. $5.14\times {10}^{21}$ unit cells

3. $1.28\times {10}^{21}$ unit cells

4. $1.71\times {10}^{21}$ unit cells

Q. Explain in an easier way what is a functional group?

Q. What is Drago Rule and what are its applications?

Q. What volume of CCl_4 (d = 1.6 g/cc) contains 6.02 × 10^{25} CCl_4 molecules (Cl = 35.5)?

Q. A solid has a BCC structure. If the distance of closest approach between the two atoms is $1.73\stackrel{\circ }{A}$. The edge length of the cell is-
($\sqrt{3}=1.73$)

1. $200pm$
2. $\frac{\sqrt{3}}{\sqrt{2}}pm$
3. $142.2pm$
4. $\sqrt{2}pm$

Q. A sample of ammonium phosphate contain 3.18 miles of hydrogen atoms.thr number of moles of oxygen atoms in the sample is

Q. The unit cell of a metallic element of atomic mass $108gmo{l}^{-1}$and density $10.5g/c{m}^3$ is a cube with edge length of $410pm$. The structure of the crystal lattice is:

1. bcc
2. fcc
3. hcp
4. None of these