## Structure of Atoms Quiz-18

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 set of quantum numbers is an impossible arrangement?
•  n=3,m=-2,s=(+1)⁄2
•  n=4,m=3,s=(+1)⁄2
•  n=5,m=2,s=-1⁄2
•  n=3,m=-3,s=-1⁄2
Solution
Q2.Rutherford’s Î±-particle scattering experiment eventually led to the conclusion that
•  Mass and energy are related
•  Electrons occupy space around the nucleus
•  Neutrons are buried deep in the nucleus
•  The point of impact with matter can be precise determined
Solution
Q3.  How many electrons in an atom with atomic number 105 can have (n+l)=8?
•  30
•  17
•  15
•  Unpredictable
Solution

Q4. Weight of 142Cto have radioactivity 1 curie [Î»(disintegration constant =4.4×10(-12) s(-1)] is
•  2×10(-4) kg
•  0.9×10(-4) kg
•  1.7×10(-4) kg
•  3.7×10(-10) kg
Solution
Q5.Which of the following nuclear changes is incorrect?
•   20 Ca40+0 n119 K40+1 H1
•   48 Mg24+Î±→14 Si27+0 n1
•   48 Cd113+0 n148 Cd112+(-1) e0
•   20 Co43+Î±→21 Si46+1 H1
Solution
Q6. The total number of p-electrons are
•  6
•  12
• 18
•  24
Solution
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Q7.The triad of nuclei that are isotonic is
•   614 C 715 N 617 F
•   612 C 714 N 919 F
•   614 C 714 N 617 F
•   614 C 714 N 919 F
Solution

Q8.Consider the following nuclear reactions
I. 714 N+ 24 He→ 817 O+ 11 H
II. 49 Be+ 11 H→ 36 Li+ 24 He
III. 1224 Mg+ 24 He→ 1427 Si+ 01 n
IV. 510 B+ 24 He→ 713 N+ 01 n
Examples of induced radioactivity would include reactions
•  III and IV
•  I and II
•  I, III and IV
•  I, II, III and IV
Solution
Q9.The radius of an atomic nucleus is of the order of
•  10(-10) cm
•  10(-13)cm
•  10(-15)cm
•  10(-8)cm
Solution
Q10. Among the following transitions in hydrogen and hydrogen-like ion spectrum, which one emits light of longest wavelength?
•  n=2 to n=1 for H
•  n=4 to n=3 for Li(2+)
•  n=4 to n=3 forHe
• n=5 to n=2 for H
Solution

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