## Chemistry Aptitude Quiz

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1. One curie of activity is equivalent to
•  3.7×10^7 disintegrations per second
•  3.7×10^10 disintegrations per second
•  3.7×10^4 disintegrations per second
•  None
Solution
Part B

Q2.The ratio of the energy of photon of 2000 â„« wavelength radiation to that of 4000 A radiation is
•  1⁄4
•  4
•  1⁄2
•  2
Solution
(d)
E=hvand ∆E=hc/Î»
E1/E2 =Î»2/Î»1 =4000/2000=2

Q3.  The correct ground state electronic configuration of chromium atom is
•  [Ar]3d^5 4s^1
•  [Ar]3d^4 4s^2
•  [Ar]3d^6 4s^0
•  [Ar]3d^5 4s^2
Solution
(a)
Cr(Z=24)
[Ar]3d^5 4s^1
This is because d^5 is a more stable half-filled configuration. Reasons for the stability of half-filled and fully filled orbitals are symmetry and exchange energy
Q4.   Which reaction shows artificial transmutation by Î±-bombardment?
•   _7^14 N+ _2^4 He→ _8^17 O+ _1^1 H
•   92^238 U→ 90^234 Th+ 2^4 He
•   6^14 C→ 7^14 N+(-1^0)e
•  None of the above
Solution

(a)
7^14 Nis bombarded by Î±-particle
Q5.When 〖 _92 U〗^238 decays it emits an Î±-particle. The new nuclide in turn emits a Î²-particle to give another nuclide X. The mass number and atomic number of X are, respectively
•  234 and 91
•  234 and 96
•  232 and 88
•  234 and 88
Solution

Q6. Among the following nuclides, the highest binding energy per nucleon is found for
•
•
•
Solution
Part C

Q7. 6 C^14 in the upper atmosphere is formed by the action of neutron on
•  〖_7 N〗^14
•  〖 _8 O〗^17
•  〖 _6 C〗^12
•  〖 _8 O〗^18
Solution
(a)
〖 _7 N〗^14→〖 _1 n〗^0+〖 _6 C〗^14

Q8.The kinetic energy of the photoelectrons does not depend upon
•  Wave number of incident radiation
Solution
Part A

Q9.In uranium mineral, the atomic ratio N_(U-238)/N_(Pb-206) is nearly equal to one. The age (in years) of the mineral is nearly (half-life period of U-238 is 4.5×10^9 yr)
•  3.0×10^8
•  4.5×10^9
•  3.0×10^9
•  4.5×10^8
Solution

Q10. Hydrogen bomb is based on the principle of
•  Nuclear fission
•  Nuclear fusion
•  Nuclear explosion
• Chemical reaction
Solution
Part B

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