Fundamental Concepts of Chemistry Mcqs | stoichiometry MCQs according to PMDC Syllabus 

1. The diameter of an atom is in the order of

A. 0.2m
B. 0.2mm
C. 0.2nm
D. 0.2pm

Answer: Option C

Q2. Which of the following are isoelectronic species?
A. H+ HH-
B. Li+ Na+ K+
C. C1- Br- I
D. F- Ne Na+


Answer: Option D

3. The mass spectrometer is used to determine the Mass number of isotopes and
A. Atomic number
B. Relative abundance
C. Electronic configuration
D. All of the above

Answer: Option B

4. Molecular ions are formed by passing
A. High energy electron beam
B.  – particle
C. X-rays
D. All of the above

Answer: Option D

5. The number of peaks obtained in mass spectrometry shows
A. Relative abundance
B. The average mass of the element
C. Number of isotopes
D. Relative isotopic mass

Answer: Option C

6. The empirical formula of chloroform is
A. CH2 C12
B. CH3C1
C. CC14
D. CHC13

Answer: Option D

7. Which one is true about isotope?
A. Same number of neutrons
B. Same mass number
C. Same physical properties
D. Same chemical properties

Answer: Option D

8. The molecular mass of water (18g) means
A. 1-mole molecules of water
B. 1-gram molecule of water
C. 3-gram atoms
D. all

Answer: Option D

9. Which of the following ion formation is always exothermic?
A. Uni-negative
B. Uni-positive
C. Di-negative
D. Di-positive

Answer: Option A

10. Which of the following statements about isotopes is correct?
A. Isotopes with the odd atomic number are abundant
B. Isotopes with the odd atomic number and even mass number are abundant
C. Isotopes with an even atomic number and even mass number are abundant
D. Isotopes with an even atomic number and odd mass no are abundant

Answer: Option C


11. The sample of isotopes of an element which needs not to be vaporized in the vaporization chamber
A. Gas
B. Liquid
C. Volatile solid
D. All

Answer: Option A

12. One mole of CO2 contains.
A. 6.022 x 1023 atoms of oxygen
B. 22-gram electrons
C. 6.022 x 1023 atoms of carbon
D. both b & c

Answer: Option D

13. Avogadro’s number may represent
A. volume of particles
B. number of particles
C. mass of particles
D. All of the above

Answer: Option D

14. The number of isotopes of elements with even mass number and an even atomic number is.
A. 280
B. 300
C. 154
D. 54

Answer: Option C

15. Size of a molecule depends upon
A. Atomicity
B. The shape of a molecule
C. Both a and b
D. Difficult to predict

Answer: Option C

16. Which of the following terms is not used for the ionic compound?
A. Formula unit
B. Empirical formula
C. Molecular formula
D. Formula mass

Answer: Option C

17. 0.36 moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is
A. 0.18 mole
B. 0.27 mole
C. 0.24 mole
D. 0.09 mole

Answer: Option A

18. Which of the following terms is used for the mass of chlorine 35.5?
A. Relative atomic mass
B. Mass number
C. Atomic weight
D. Relative isotopic mass

Answer: Option A

19. Which one of the following has the maximum number of isotopes?
A. Oxygen
B. Carbon
C. Tin
D. Chlorine

Answer: Option C

20. Which one of the following is not the monoisotopic element?
A. Arsenic
B. Uranium
C. Iodine
D. Nickel

Answer: Option B