11. When a stream of electrons strikes a metal target, the resulting radiation is
(a) 𝛾− Rays
(b) Electron reemission
(c) 𝑋− Rays
(d) Neutrons
Answer: (c)
12. What is the correct order of boiling points for the following hydrides?
Answer: (b)
13. 2-electron, 3-centered bond is found in
Answer: (d)
14. Which of the following pair of species is isoelectronic and isostructural?
Answer: (d)
15. Which of the following molecule have highest percentage of 𝑝-character in the hybrid orbitals of the central atom?
Answer: (c)
16. The crystal structure of ice has
(a) Octahedral geometry
(b) Tetrahedral geometry
(c) Square planar geometry
(d) Trigonal bipyramidal geometry
Answer: (b)
17.
Answer: (b)
18. Consider the following reactions:
Which of the above reactions will occur spontaneously?
(a) 1, 2 and 3
(b) 1, 3 and 4
(c) 1, 2 and 4
(d) 2, 3 and 4
Answer: (b)
19. Schottky defect in solids arises from:
1. An excess charge generation
2. A pair of holes formed due to absence of ions
3. Presence of interstitial electrons
(a) 1 only
(b) 2 only
(c) 3 only
(d) 1, 2 and 3
Answer: (b)
20. Consider the following statements about chirality:
1. Molecules which are not super-imposable on their mirror images are chiral
2. Chiral molecule can have simple axis of symmetry
3. A carbon atom to which four different groups are attached is a chiral centre
4. A compound whose molecules are achiral exhibits optical activity
Which of the above statements are correct?
(a) 1 and 3
(b) 2 and 3
(c) 1 and 4
(d) 2 and 4
Answer: (b)