9. The unit cell below is best described as what type of crystal structure? (1)
ID: 1083198 • Letter: 9
Question
9. The unit cell below is best described as what type of crystal structure? (1) body-centered cubic (2) simple cubic (3) trigonal (4) face-centered cubic 10. Which of the following characteristics indicates the presence of weak intermolecular forces in a liquid? (1) a low heat of vaporization pressure (4) a high boling point (2) a high critical temperature (3) a low vapor 11. The intermolecular forces present in CHsOH include which of the following? 1. dipole-dipole 11, ion-dipole m' dispersion . hydrogen bonding (1) I, I,II, and IV (2) 1 and Ill (3)1. m, and IV (4)1 and KBr, crystallizes like NaCl in a face-centered lattice. The ionic radi of K and Br ons are 133 pm and 195 pm, respectively. Assuming that all Br ions are positioned in the face and corners of the unit cell, while the K ions are positioned along the edge alternating between anions calculate the length, d, of a unit cell edge. Br (3) 523 pm (4) 658 pm (1) 230 pm (2) 328 pm 13. The number of atoms in a body-centered cubic unit cellis (1)1 (2)2 (3)4 (4)8Explanation / Answer
9)
It has 8 atoms at the corners and 1 at bode center
So, it is body centered cubic unit cell
Answer: 1
10)
low heat of vapourisation is correct answer
weaker bond implies that the substance can be vapourised easily
So, heat of vapourisation will be small
Answer: 1
11)
Since there is H attached to O, it has hydrogen bonding
Because of presence of O and lone pair on O, it has dipole-dipole interaction
dispersion force is present in all molecules
Here there are no ion so, there is no ion-dipole force
Answer: 3
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