A Buzz in the World of Chemistry Reading Answers. We covered all the A Buzz in the World of Chemistry Reading Answers in this post for free so that you can practice well for the exam.
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A Buzz in the World of Chemistry Objective Reading with Answers for Students
Which one of the following statements is not correct?
(a) Elements are defined by the number of protons they possess.
(b) Isobars are atoms having the same atomic number but different mass numbers.
(c) The mass number of an atom is equal to the number of nucleons in its nucleus.
(d) Valency is the combined capacity of an atom.
Option b – Isobars are atoms having the same atomic number but different mass numbers
In graphite, each carbon atom is bonded to three other carbon atoms:
(a) forming a three-dimensional structure
(b) in the same plane giving a hexagonal array
(c) in the same plane giving a square array
(d) in the same plane giving a pentagonal array
Option b – in the same plane giving a hexagonal array
Soap solution used for cleaning purposes appears cloudy. This is due to the fact that soap micelles can:
(a) refract light
(b) scatter light
(c) diffract light
(d) polarize light
Option b – scatter light
Employing Chromatography, one cannot separate:
(a) radio-isotopes
(b) colors from a dye
(c) pigments from a natural color
(d) drugs from blood
Option a – radio-isotopes
Consider the following statement: “The atomic number of an element is a more fundamental property than its atomic mass.” Who among the following scientists has made the above statement?
(a) Dmitri Mendeleev
(b) Henry Moseley
(c) J. J. Thomson
(d) Ernest Rutherford
Option b – Henry Moseley
Very small insoluble particles in a liquid may be separated from it by using:
(a) crystallization
(b) fractional distillation
(c) centrifugation
(d) decantation
Option d – decantation
Which one of the following statements about glass is not correct?
(a) Glass is often said to be a supercooled liquid.
(b) Glass has no definite melting point.
(c) Soda glass is harder than Pyrex glass.
(d) Boron is present in pyrex glass.
Option c – Soda glass is harder than Pyrex glass
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