STRUCTURE OF ATOM Quiz-16

Chemistry Aptitude Quiz

Dear Readers,

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. Which of the following is artificial radioactive series?

•  4n+1
•  4n+2
•  4n
•  4n+3

Solution
(a) Artificial series is (4n+1)

Q2.Radioactive disintegration differs from a chemical change in being

•  An exothermic change
•  A spontaneous process
•  A nuclear process
•  A unimolecular first-order reaction

Solution
(c) Radioactive disintegration is a nuclear process

Q3.  The instability of a nucleus is due to

•  High proton electron ratio
•  High electron neutron ratio
•  Low proton electron ratio
•  Low proton neutron ratio

Solution
(d) The nucleus is unstable, if p/n<>1

Q4.   The electronic configuration of an element is 1s^2 2s^2 2p^6 3s^2 3d^5 4s^1. This represents its

•  Excited state
•  Ground state
•  Cationic form
•  Anionic form

Solution

(b) _24 Cr=1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^1 This is the ground state electronic configuration for chromium. There is only one electron in the 4s orbital because d^5 is a more stable half-filled configuration. Reasons for the stability of the half-filled and fully filled orbitals are symmetry and exchange energy

Q5.The distance between nucleons in atomic nucleus is of the order of (1 Fermi = 10^(-13) cm)

•  2 Fermi
•  25 Fermi
•  100 Fermi
•  40 Fermi

Solution
 Part A

Q6. The decreasing order of energy for the electrons represented by the following sets of quantum numbers is: 1. n=4,l=0,m=0,s=±1⁄2 2.n=3,l=1,m=1,s=-1⁄2 3.n=3,l=2,m=0,s=+1⁄2 4.n=3,l=0,m=0,s=-1⁄2

•  1>2>3>4
•  2>1>3>4
• 3>1>2>4
•  4>3>2>1

Solution
Part C

Q7.The equipment used to carry out nuclear reaction in a controlled manner is called

•  Breeder reactor
•  Nuclear reactor
•  Thermonuclear fission
•  Cyclotron

Solution
Part B

Q8.The atomic mass and atomic number of lead are 208 and 82. The atomic mass and atomic number of bismuth are 209 and 83. The neutron/proton ratio in an atom

•  Is higher in lead than in bismuth
•  Is lower in lead than in bismuth
•  Is equal in both lead and bismuth
•  None

Solution

Q9.How many α-particles are emitted in the nuclear transformation: _84 Po^215 →_82 Pb^211+ ? _2 He^4

•  0
•  1
•  2
•  3

Solution

Q10. 

•  2
•  4
•  6
• 8

Solution

Written by: AUTHORNAME

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