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