Order Acid catalyzed ester hydrolysis

Order Acid catalyzed ester hydrolysis
96. A crystalline substance has molar mass of 75 g mol–1, and it belongs to bcc structure and edge length 500 pm. Its
density in g cm–3 is its
(a) 5 (b) 2 (c) 3.5 (d) 4.8
97. r = 45 pm in a compound with zinc blende structure. The ideal magnitude of r
”
(a) 0.78 Å (b) 0.68 Å (c) 0.87 Å (d) 0.59 Å
99. Silver (at wt 108) crystallizes in the cubic system. The number of unit cells per mole = 1.48 × 1023. Calculate the side
length of the unit cell density = 10.6 g cm–3.
(a) 3.5 Å (b) 5.1 Å (c) 4.1Å (d) 4.9 Å
100. In a hypothetical isolated unit cell of NaCl the number of Na and Cl–
ions present are
(a) 4 and 4 (b) 6 and 6 (c) 13 and 14 (d) 27 and 27
101. In a bcc lattice what is (i) the nearest and (ii) the next nearest number of atoms for a given atom?
(a) 8, 8 (b) 8, 6 (c) 6, 8 (d) 6, 6
8.52 Chemical Kinetics and Solid State
102. Aluminium crystallizes in the cubic system. a = 4.05 Å density = 2.70 g cm–3 [At. wt = 27 g] what is the unit cell type.?
(a) fcc (b) sc (c) bcc (d) rhombohedral
103. What is the ratio of void space percentage in bcc and fcc unit cells.
(a) 1.231 (b) 1.414 (c) 1.33 (d) 1.5
Order Acid catalyzed ester hydrolysis
104. Ag, has the same structure as ZnS, density of silver iodide = 5.67 g cm–3[At. wt: Ag:108 g, I:127 g] calculate the length
of the unit cell edge.
(a) 5.16 Å (b) 6.02 Å (c) 6.51 Å (d) 7.22 Å
105. At room temperature sodium has a bcc structure a = 4.2906 Å. At 195qC, the density is only 4% larger but a is now
5.35 Å. What is the unit cell type at 195qC.?
(a) sc (b) trigonal (c) bcc (i.e., no change) (d) fcc
106. A first order reaction is 50% completed in 30 minutes at 27°C and in 10 minutes at 47°C. Calculate the rate constant
of the reaction at 27°C and the activation energy of the reaction in kJ mol–1.
(a) k = 0.0231 min–1 (b) k = 0.04385 min–1
Ea
= 43.85 kJ mol–1 Ea = 23.1 kJ mol–1
(c) k = 0.0462 min–1 (d) k = 0.0693 mol–1
Ea = 43.85 kJ mol–1 Ea
= 12.5 kJ mol–1
107. For the reaction 2A B o D E, the following mechanism is proposed. A B o C D (slow)
A C o E (fast).
The rate law expression for the reaction is
(a) r = k[A]2
[B] (b) r = k[A][B] (c) r = k[A]2 (d) r = k[A][C]
108. 50% of a first order reaction is complete in 346 s. The time required to complete 90% of the reaction in seconds is
(a) 796.8 (b) 499.2 (c) 115.15 (d) 1151.5
109. A metallic conductor among the following is
(a) ReO3
(b) CrO2 (c) VO (d) all the above