Coordination Number

Q.

The number of atoms present in 120 amu of Ca are

Q. 25. If a is the length of the side of a cube the distance between the body centered atom and one corner atom in the Cube will be

Q. In CCP, there are 8 tetrahedral sites and all are present completely inside the unit cell.There are 13 octahedral sites out of which 1 is at the body centre and 12 are at edge centres.Like CCP, another packing is HCP, in which the number of tetrahedral sites that are completely inside one unit cell is x.find x

Q. No.of atoms in 8 g of oxygen

Q. ab has nacl type structure if all the atoms touching one of the triad axis is removed formula of unit cell will be a. A3B2 b. a4b5 c. a6b9 d.ab

Q.

On a humid summer day, the partial pressure of water in the atmosphere is 18 mm Hg. The barometric pressure on this day is as high as 766 mm Hg, Calculate the partial pressures of nitrogen and oxygen if 78.0% of the dry atmosphere is composed of nitrogen molecules and 21.0% of oxygen? (1% of the dry atmosphere is composed of all other gases)

1. 

2. 

3. 

4. 

Q. 60 CsBr crystallises in body centre cubic lattice.The unit cell length is 436.6 .given that mass of Cs is 133 and Br is 80amu.find density of CsBr?

Q. Q 33/75 Which among the following has highest number of atoms? 5 g of CO 24g of CO 1g of H 26g of O3

Q. 39. In P4O10 the no. of oxygen atoms attached to each phosphorus are

Q. 11. What is Kernel in Atomic structure? How many Kernel electrons found in Argon and Iron?

Q. In an alloy of copper, silver and gold, the copper atoms constitute the ccp lattice and silver atoms occupies half of the tetrahedral voids and gold is present at the octahedral voids of the unit cell.
What will be the formula of the compound if all the atoms from one of the faces of the cube are removed?

1. $C{u}_{3}A{g}_{3}A{u}_4$
2. $C{u}_{8}A{g}_{4}A{u}_3$
3. $C{u}_{8}A{g}_{3}A{u}_3$
4. $C{u}_{3}A{g}_{4}A{u}_3$

Q. 6. For which element (IP-IP2<11eV) is found 1) Al 2)Mg 3) Ar 4) none of these

Q. the number of atoms in 88g CO2 is

Q. draw the stucture of the following atom 40/20 ca 23/11na 40/18ar 35/17 cl 30/15p 4/2 he

Q. 44. In a unit cell, atomsA, B, CandD are present at half of total corners, all face centers, body centre and one third of all edge centers respectively.Then formula of unit cell is

Q. why do carbocations have sp2 hybridisation?

Q. 3.Which of the following molecules are paramagnatic?? Ko2, Na202, cao, KF, No2, No (1)4 (2)5 (3)3 (4)2

Q. How to know that CCP lattice contains 4 atoms per unit cell

Q.

The coordination number of a metal crystallising in a simple cubic structure is

1. 12

2. 4

3. 8

4. 6

Q. total number of atoms in 44 g of Carbon dioxide is ?

Q.

Number of atoms present in 22g of CO2 is

Q. In which of the following pairs, the cations occupy, same type of site?

1. $NaCl,CsCl$
2. Zinc blende $\left(ZnS\right),N{a}_{2}O$
3. $N{a}_{2}O,Ca{F}_2$
4. $CsCl,$ Zinc blende $\left(ZnS\right)$

Q. In Calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion $\left(C{a}^{2+}\right)$ and fluoride ion $\left(F^{-}\right)$ are

1. 8 and 4
2. 4 and 8
3. 4 and 2
4. 6 and 6

Q. Consider a cube with atom 'M' occupying the body centre, atom 'A' occupying the corners of the cube, atom 'B' occupying the edges of the cube and atom 'C' occupying the face centres.
Mark the correct options when the formula is $M_m{A}_a{B}_b{C}_c$, if:

1. Plane is drawn diagonally, atoms in the plane vanish, ratio of $c:a$ is 4
2. Plane is drawn diagonally, atoms in the plane vanish, $a+b=8$
3. Line is drawn along an edge, atoms on the line vanish, $a+b=14$
4. Line is drawn along an edge, atoms on the line vanish, ratio of $c:a$ is 4

Q.

Potassium crystallizes in a bcc lattice, hence the coordination number of potassium in potassium metal is

[KCEE 1993]

1. 0

2. 4

3. 6

4. 8

Q. The coordination number of a metal crystallizing in a hexagonal close packed structure is

[NCERT 1978; IIT 1999]

1. 4

2. 12

3. 8

4. 6

Q. Titanium crystallizes in a face centred cubic lattice. It reacts with carbon or hydrogen interstitially by allowing atoms of these elements to occupy holes in the host lattice. Hydrogen occupies tetrahedral holes but carbon occupies octahedral holes the formula of titanium carbide and hydride are

Q.

In H.C.P. arrangement in three dimensions, the overall coordination number of each sphere is

1. 4

2. 6

3. 9

4. 12

Q. 13. Sodium crystallize in a face centre cubic lattice the approximate no.of unit cell in 5.0g of sodium is

Q. Q 6/30 What will be the longestwavelength line in Balmer series ofspectrum of H-atom?