STRUCTURE OF ATOM Quiz-17

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 is the correct combination? Change in Emission Atomic Mass Neutron Number number number

•   α -2 -2 -2
•   β- +1 0 -1
•  γ 0 0 -1
•  β^+ -1 0 0

Solution
Part B

Q2.

•   ^18 Ois in ester
•   ^18 Ois in water
•   ^18 Ois in both
•   ^18 Ois in none

Solution

Q3.  Constituents of wine are carbon, hydrogen and oxygen. Half-lives of ^13 C,^15 Oand ^3 Hare respectively 5730 yr, 124 s and 12.5 yr. A bottle of wine was sealed about 6 years ago. To confirm its age, which of the isotopes would you choose to determine its age?

•   _6^13 C
•   _8^15 O
•   _1^3 H
•  Any of these

Solution
Part C

Q4.   Which of the following is true?

•  The electron density in the xy-plane in 3d_xy orbital is zero
•  The electron densities in the xy- and xz-plane in 3d_yz orbital are zero
•  The electron density in the xy-plane in 3d_(z^2 ) orbital is zero
•  Pauli exclusion principle is followed by bosons which have integral spin

Solution

Q5.Atomic weight of Th is 232 and its atomic number is 90. The number of α- and β-particles which will be lost so that an isotope of lead (atomic weight 208 and atomic number 82) is produced is

•  4α+6β
•  6α+4β
•  8α+2β
•  10α+2β

Solution
 

Q6.  _90^234 th(IIIB) emits particles such that new element is in IIA. Particles emitted is/are

•  One α,one β
•  One β,one α
• Only one β
•  Only one α

Solution
(d) _90^234 th□(→┴( -α_1 ) ) _88^230 Rn Note Element with atomic number 88 belongs to IIA

Q7.The radius of the first Bohr orbit for He^⊕ is

•  0.529 Å
•  0.264 Å
•  0.132 Å
•  0.176 Å

Solution
Part B

Q8.The age of rocks on earth or the samples of rocks and dust brought back form the moon can be found by determining the proportion of radioactive ………. In the rock of dust.

•  Potassium and stable calcium
•  Uranium and stable lead
•  Carbon and stable carbon
•  Radium and stable lead

Solution
Part B

Q9.Which of the following has magic number of neutrons?

•   _13 Al^27
•   _13 Al^27
•  〖 _92 U〗^238
•   _26 Fe^56

Solution
Part B

Q10. The chemist who helped in the discovery of the maximum number of transuranic element is:

•  Sir Robert Robinson
•  Sir J.J. Thomson
•  Professor Sea Borg
• Sir N.C. Hishel-wood

Solution
Part C

Written by: AUTHORNAME

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