This document contains a 17 question chemistry test covering topics like fluids, solids, crystal lattices, reaction rates, reaction orders, activation energy, and crystal structures. The test asks students to define terms, calculate rates of change, differentiate between amorphous and crystalline solids, derive expressions, and determine properties based on given unit cell information. It covers a wide range of concepts in chemistry and tests students' understanding of these concepts through calculations and explanations.

1. SURE SUCCESS
Class Test-1 Time-1hrs
CBSE Class XII F.M-35
1. What are fluids? Give examples. [1]
2. Solids are rigid why? [1]
3. What are the characteristics of rate constant? [1]
4. Define the term: Crystal lattice [1]
5. Give one example of each – Tetragonal and hexagonal crystal system. [1]
6. A chemical reaction 2A 4B+C in gas phase occurs in a closed vessel. The concentration of B is found to
be increased by 5 X 10-3 mole L-1 in 10 second. Calculate (i) the rate of appearance of B (ii) the rate of
disappearance of A? [2]
7. Differentiate Schottky defect and Frankel defect. Name the compound which exhibits both. [2]
8. Define pseudo-first order reaction. Give an example of pseudo – first order reaction? [2]
9. What is a Zero’th-order reaction? [2]
10. For the following reactions, write the rate of reaction expression in terms of reactants and products?[2]
i) 4NH3 (g) + 5O2 (g) 4NO (g) + 6H2O (g)
ii) 2N2O5 2NO2 + O2
11. How many atoms are there in a unit cell of a metal crystallizing in a: [2]
(a) FCC structure
(b) BCC structure
12. Derive the expression establishing the relationship between radius and edge length in a body
centered cubic structure. [3]
13. Differentiate between amorphous and crystalline solids with reference to [3]
(1) Melting point
(2) Cleavage property
(3) Nature
14. In general it is observed that the rate of a chemical reaction doubles with every 10˚ rise in
temperature. If this generalization holds for a reaction in the temperature range295K to 305K, what
would be the activation energy for this reaction? (R=8.314Jk-1 mol-1) [3]
15. The compound CuCl has ZnS structure and the edge length of the unit cell in 500pm. Calculate the
density. (Atomic masses: Cu = 63, Cl = 35.5, Avogadro no = 6.02´1023 mol-1) [3]
16. The rate of a particular reaction quadruples when the temperature changes from 293 K to 313 K.
Calculate activation energy for such a reaction. [2]
17. What is the contribution of an atom per unit cell if the atom is: [3]
(a) At the corner of the cube.
(b) On the face of the cube.
(c) In the centre of the cube.