1311. The coordination number of Na+ & Cl ions in NACL are :

A. 8,8
B. 8,4
C. 4,8
D. 6,6 *

1312. The number of atoms per unit cell of simple cubic body-centered cubic and face centered cubic cells are respectively :

A. 1,2,3
B. 1,4,2
C. 1,2,4 *
D. 1,3,2

1313. Number of atoms in unit cell of Na (BCC) and mg (FCC) are respectively :

A. 4,4
B. 2,2
C. 2,4 *
D. 1,4

1314. Which of the following is not Allotrope of carbon :

A. Graphite
B. Diamond
C. Amorphous carbon
D. All are allotropes *

1315. Which of the following undergoes a chemical change when conduct electricity :

A. Graphite
B. Aluminum
C. Molten Nacl *
D. All

1316. Transition temperature of polymorphs of a substance is _________ than melting point :

A. Always higher
B. Always lower *
C. Equal
D. All are possible

1317. Which of the following has high lattice energy:

A. Naf *
B. Nacl
C. Nabr
D. Nal

1318. Lattice energy depends upon :

A. Charges of Ions
B. Sizes of Ions
C. Both *
D. None

1319. A reversible rxns is said to have attain equilibrium when :

A. Backward reactions stops
B. Forward reactions stops
C. Both Forward and Backward rxns stops
D. Both backward and forward rxns occurs with same speed *

1320. The equilibrium between water and its vapor is a :

A. Chemical equilibrium
B. Physical equilibrium *
C. Mechanical equilibrium
D. None of these