STRUCTURE OF ATOM Quiz-2

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. After the emission of a β-particle followed by α-particle from 〖_83^214〗Bi;the number of neutrons in the atom is

•  130
•  129
•  128
•   127

Solution

Q2.In the Schrodinger’s wave equation Ψ represents

•  Orbit
•  Wave function
•  Wave
•  Radial probability

Solution
(b)
Ψ=wave function

Q3.   Which of the following has the maximum penetrating power?

•  α-particle
•  Proton
•  γ-particle
•  Positron

Solution
Part C

Q4.   Which of the following projectiles is the best for bombarding the nuclide?

•  α-particle
•  Proton
•  Deuteron
•  Neutron

Solution
(d) Neutron is the best projectile

Q5.Which of the following is false?

•  The energy of an electron in an orbital of a hydrogen-like species depends only on the principal quantum number n
•  The energy of an electron in an orbital of a hydrogen-like species depends only on the principal quantum number n
•  The expression of angular momentum of an electron in an orbital is given as √(l(l-1) ) (h/2π)
•  The z-component of angular momentum of an electron in an orbital is given as m(h/2π)

Solution
 (b)
1. True
2. False. The angular momentum depends only on the azimuthal quantum number
3. True
4. True

Q6. Which of the following elements belongs to 4n-series?

•  Pb-207
•  Bi-209
• Pb-208
•  Pb-206

Solution
(c) Pb-208 belongs to 4n series

Q7.The radius of second Bohr’s orbit is

•  0.053 nm
•  0.053/4 nm
•  0.053×4 nm
•  0.053×20 nm

       

Solution

Q8.Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

•  Low ionization energy of sodium
•  Sublimation of metallic sodium to give yellow vapour
•  Emission of excess energy absorbed as a radiation in the visible region
•  Photosensitivity of sodium

Solution
Part C

Q9.When n/p ratio of an isotope is greater than the stable isotope of that element, it emits

•  β-particles
•  α-particles
•  Neutron
•  Positron

Solution
(a)
Isotope must have some number of proton, therefore β-particle will be emitted

Q10. The electronic configuration of a diapositive ion M^(2+)is 2, 8,14 and its mass number is 56. The number of neutrons present is

•  32
•  42
•  30
• 34

Solution
(c)
Electronic configuration of M^(2+)=2+8+14=24e^-
Since two e^- has been lost in forming M^(2+) ion from metal, so total number of protons should be =24+2=26
Hence, number of neutrons =56-26=30

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