Basic Chemistry Mcqs with Answers

Our collections of Multiple choice questions and answers focuses on study of Basics of Chemistry. These questions are chosen from a collection of most authoritative and best reference books on Chemistry. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams and tests and Chemical industry job interviews. One should practice our Mcqs to assimilate Basic Chemistry Topics comprehensively.

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3.
Mass spectrometer is used to determine Mass number of isotopes and

Atomic number

Relative abundance

Electronic configuration

All of the above

4.
Molecular ions are formed by passing

High energy electron beam

? - particle

X-rays

All of the above

5.
The number of peaks obtained in mass spectrometry shows

Relative abundance

Average mass of element

Number of isotopes

Relative isotopic mass

7.
Which one is true about isotope?

Same number of neutrons

Same mass number

Same physical properties

Same chemical properties

9.
Which of the following ion formation is always exothermic?

Uni-negative

Uni-positive

Di-negative

Di-positive

10.
Which of the following statements about isotopes is correct?

Isotopes with odd atomic number are abundant

Isotopes with odd atomic number and even mass number are abundant

Isotopes with even atomic number and even mass number are abundant

Isotopes with even atomic number and odd mass no are abundant

11.
The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer

Gas

Liquid

Volatile solid

All

12.
One mole of CO2 contains.

6.022 x 1023 atoms of oxygen

22-gram electrons

6.022 x 1023 atms of carbon

Both b & c

13.
Avogadros number may represent

Volume of particles

Number of particles

Mass of particles

All of the above

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