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CHEMISTRY Q.1.
In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005 %. Certainity with which the the position position of the electron can be located is position of the electron an be located is position of the electron can b located (h 2 =6.6 m mass of the electron, e m= 9.1 (a) 1.52 (c)
(b) m (d)
(c) 3 (e) (a)4
Q.7. The ionization enth lpy of hydrogen atom is 1.312 J . The energy required to excite the electron in th atom from n = 1 to n = 2 is
J (b) 6.56 J (c) 7.56 J (d) 9.84 J (a) 8.51
Q.2. Calculate the wavelength (in nanometer) associated with a proton movi ng at 1.0
(Mass of proton = 1.6 7 kg Js.) (a) 0.032 nm (c) 2.5 nm
Q.8.
(b) 0.40 n (d) 14.0 n
Q.3. Which of the following sets of quant um number is correct? (a)
Q.9.
(b) (c)
Q.10.
(d)
QThe correct set of four quantum num bers for outer most electron of potassium (Z = 19) i
(a) 4, 1, 0,
(c) 4, 0, 0,
(d) 3, 0, 0, (b)3, 1, 0,
Q.5. A body of mass x kg is moving with a velocity is -1 100 ms . Its de-Broglie wavelen th is 6.62
m. Hence, x is (h =6.62 (a) 0.1 kg (b) 0.25 kg (c) 0.15 kg (d) 0.2 kg
(d)2 ( ) 1.5
Q.11.
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Q.12.
Q.13.
Q.18.
Q.19.
Q.14.
Q.20.
Q.15.
Q.21.
Q.16.
Q.17.
Q.22.
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Q.29. Q.23.
Q.24. Q.30.
Q.25. Q.31.
Q.32. Q.26.
Q.33. Q.27.
Q.28.
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Q.34.
For a Bohar atom momentum M of the electron is (n=0, 1, 2,…..)
(c) (a)
(d) (b)
Q.39. An isotone of is (a)
(b)
(c)
(d)
Q.40. The phenomenon of emission of visible light as a result of chemical change is known as
Q.35.
The H-sepectrum show
(a) chemiluminesscene
(a) Heisenberg’s uncertainty principle
(b)florescence
(b) differaction
(c) phosphorescence
(c)polarisation
(d) photosensitization photosensitization
(d) presence of quantized energy level Q.41. The uncertainty in the momentum of an electron Q.36. Which of the following statements does not form a part of Bohr’s model of hydrogen atom?
position will be
(a) Energy of the electrons in the orbit is
(a) 1.50× 10 m
(b) 1.0× 10 m
quantized
(c) 5.27× 10 m
(d) 5.25. × 10 m
(b) The electron in the orbit nearest the nucleus has the lowest energy (c)Electrons revolve in different orbits around the nucleus (d) The position and velocity of the electrons in the orbit cannot cannot be determined determined simultaneously
Q.37.
is 1.0× 10 kg . The uncertainty in its
Electrons will first enter into the set of quantum numbers n=5, l= 0 or n =3, l =2
= 5, = 0
(a
(b) both possible
(c) = 3, = 2
(d) data insufficient
Q.38. Which of the following is non-permissible? (a) = 4, = 3, = 0
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ANSWER KEY Q.NO
1
2
3
4
5
6
7
8
9
10
ANS
C
B
A
C
A
D
D
B
C
C
Q.NO
11
12
13
14
15
16
17
18
19
20
ANS
C
A
A
C
B
B
D
A
B
D
Q.NO
21
22
23
24
25
26
27
28
29
30
ANS
C
E
A
C
D
D
A
D
B
D
Q.NO
31
32
33
34
35
36
37
38
39
40
ANS
A
A
A
D
D
D
C
C
B
A
Q.NO
41
ANS
C
