## Structure of Atoms Quiz-19

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. In what ratio should 17 Cl37 and 17 Cl35 be present so as to obtain 17 Cl35.5?
•  1:2
•  1:1
•  1:3
•  3:1
Solution
Q2.If the wavelength of the first line of the Balmer series of hydrogen atom is 656.1 nm, the wavelength of the second line of this series would be
•  218.7 nm
•  328.0 nm
•  486.0 nm
•  640.0 nm
Solution
Q3.  The half-life of 99 Tcis 6.0 h. Hence, average-life is
•  4.17 h
•  3.0 h
•  8.66 h
•  8.00 h
Solution

Q4. Which equation is true for transient equilibrium? (Î»= disintegration constant; t= half-life)
•  N1 Î»1=N2 Î»2
•  N1 t2=N2 t1
•  Both (a) and (b)
•  None of these
Solution
Q5. 92238 U(III B, actinide series) emits one Î±- particle. New element will be a/an
•   Alkali metal
•   Alkaline earth metal
•   Actinide
•   Chalcogen
Solution
Q6. Which reaction is an example of chain reaction?
•   92235 U→ 24 He+ 90231 Th
•   3475 Se→ 3575 Br+(-10)e
• 53123 I→ 53123 I+energy
•   92235 U+ 01 n→ 56142 Ba+ 3691 Kr+3 01 n
Solution

Q7.The nucleus of an atom is made up of pprotons and nneutrons. For the most stable and abundant nuclei
•   peven, n odd
•   p,nboth odd
•   podd, neven
•   p,nboth even
Solution

Q8.Eka-Hg will have IUPAC nomenclature as Uub. Its atomic number is
•  80
•  110
•  111
•  112
Solution
Q9.The shortest and longest wave number in H spectrum of Lyman series is (R=Rydberg constant)
•  3/4 R,R
•  1/R,4/3 R
•  R,4/3 R
•  R,3/4 R
Solution
Q10. Which of the following properties of an element is a whole number?
•  Atomic mass
•  Atomic volume
• Mass number
Solution

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STRUCTURE OF ATOM Quiz-19