CBSE Guess > Papers > Important Questions > Class XII > 2007 > Chemistry > Solid States

Solid States

Q. 1. A sample of solid scatters a beam of Xrays from a crystal plane at an angle of 11.8⁰. Find the wave length of e crystal if inter planar distance is 0.3nm and it is a first order diffraction.

Q. 2. A sample of crystalline solid scatters a beam of Xrays of λ = 2.3A⁰ at an angle of 2θ=27⁰8’. If it is a first order diffraction find the interplanar distance.

Q. 3. Iron(II) oxide crystallize as Fe _0.93O. Find the %Fe²⁺ and Fe³⁺ in this compound.

Q. 4. A solid AB has Nacl structure. If the radius of cation is 100pm, what is the possible maximum and minimum radius of anion B.

Q. 5. If the radius of Mg²⁺, Cs⁺, O^2-,S^2- and Cl^- ion are 0.65A⁰, 1.69A⁰,1.40A⁰,1.84A⁰ and 1.81A⁰ respectively. Find the Coordination numbers of cation in MgO,MgS, and CsCl.

Q. 6. In corundum, Oxide ion are in hcp and Al³⁺ ion occupy 2/3 of the Octahedral void.What is the formula of corundum?

Q. 7. A Cubic solid is made up of 2 elements P and Q .Q occupies the corners of the cube and P at the body centre.What is the formula of the compound?. What are the coordination Numbers of Pand Q?

Q. 8. In a crystalline solid anion C occupies Ccp,cation A occupy 50% tetrahedral void and cation B occupies 50% octahedral void. What is the formula of the solid?

Q. 9. If Nacl is doped with 10^-3mole% of Srcl₂. What is the concentration of Cation Vacancies?

Q. 10. Sodium metal crystallizes in bcc. a = 4.3A⁰ What is the radius of Sodium atom?

Q. 11. Copper crystallize in Fcc with a density of 9 g/cm³. Calculate the radius of Copper atom (Atomic mass of copper = 63).

Q. 12. Chromium crystallize in bcc with an atomic diameter of 250 pm. Determine the density of unit cell. (Atomic mass of Cr=52).

Q. 13. Calculate the value of Avagadronumber D of Nacl =2.165g/cm³. Distance between Na⁺ and Cl^- is 281pm (Molar mass of Nacl = 58.5.).

Q. 14. Cs Br has bcc structure. a = 400pm. Calculate the distance between Cs⁺ and Br^-.

Q. 15. KF has Nacl structure . Find the distance between K⁺ and F^-- D = 2.5 g/cm³. Molar mass of KF = 58.

Q. 16. An element crystallizes as bcc. a=288pm. D = 7.2g/cm³. How many atoms are there in 208g of this element?

Q. 17. CuCl has ZnS structure. D=3.4g/cm³ Find the edge length of the unit cell ( molar mass of CuCl=99)

Q. 18. An element crystallizes in FCC with an edge length of 200pm. Calculate its density if 200g of this element contains 24 x 10²³ atoms.

Q. 19. Unit cell of an element has atomic mass 108. D=10.5 g /cm³. Edge length =409pm. Find the structure of the crystal lattice .

Q. 20. An element crystallizes into a structure which is a cubic type unit cell having one atom at each corner and two atoms in one of its diagonal. Volume of unit cell is 24 x 10^-24cm³ D = 7.2g/cm³. Find the number of atoms in 200g of this element.