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.
2. Which of the following are isoelectronic species?
H+ H H-
Li+ Na+ K+
C1- Br- I
F- Ne Na+
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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
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4. Molecular ions are formed by passing
High energy electron beam
? - particle
X-rays
All of the above
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5. The number of peaks obtained in mass spectrometry shows
Relative abundance
Average mass of element
Number of isotopes
Relative isotopic mass
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6. Empirical formula of chloroform is
CH2 C12
CH3C1
CC14
CHC13
7. Which one is true about isotope?
Same number of neutrons
Same mass number
Same physical properties
Same chemical properties
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8. Molecular mass of water (18g) means
1-mole molecules of water
1-gram molecule of water
3-gram atoms
All
9. Which of the following ion formation is always exothermic?
Uni-negative
Uni-positive
Di-negative
Di-positive
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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
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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
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13. Avogadros number may represent
Volume of particles
Number of particles
Mass of particles
All of the above
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14. The number of isotopes of elements with even mass number and even atomic number are.
280
300
154
54
15. Size of molecule depends upon
Atomicity
Shape of molecule
Both a and b
Difficult to predict
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