Medical College Admission Test (Bangladesh) · Chemistry

Qualitative Analysis, Chemical Bonding and Periodic Trends

35 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 35 questions

  1. What characteristic flame color is produced by Sodium salts during a flame test?
  2. What characteristic flame color is observed for Potassium salts viewed through blue cobalt glass?
  3. Which reagent is used as a sensitive wet test to detect Ammonium ions (NH4+) through the formation of a brown precipitate?
  4. What is the chemical formula of the brown coordination complex formed in the confirmatory ring test for Nitrate ions (NO3-)? (Hard)
  5. Which precipitating reagent is added to test for the presence of Sulfate ions (SO4 2-) forming a white precipitate insoluble in dilute HCl?
  6. Why are transition metal complexes generally colored in aqueous solution? (Hard)
  7. Which property explains why Sc3+ and Zn2+ ions form colorless solutions in water?
  8. Which transition metal ion exhibits the maximum number of unpaired (Hard) d-electrons and highest paramagnetism?
  9. What is the coordination number of the central Cobalt ion in the complex [Co(NH3)6]Cl3?
  10. What is the oxidation state of Nickel in the neutral coordination compound Nickel Tetracarbonyl [Ni(CO)4]?
  11. Which pair of elements demonstrates a classic diagonal relationship in the periodic table?
  12. Why do heavy p-block elements like Thallium (+1) and Lead (+2) favor oxidation states 2 units lower than their group valency? (Hard)
  13. How many hydrogen bonds connect an Adenine-Thymine (A-T) base pair (Hard) compared to a Guanine-Cytosine (G-C) pair in DNA?
  14. Which secondary protein structural motif is stabilized by intramolecular hydrogen bonds between peptide carbonyl (C=O) and amino (N-H) groups?
  15. Which property of noble gases explains why they exist strictly as monoatomic gases under standard conditions?
  16. What is the geometry of the Triiodide anion (I3-) according to VSEPR theory? (Hard)
  17. What is the bond order and magnetic property of Nitric Oxide (NO) molecule? (Hard)
  18. Which oxide of nitrogen is commonly known as 'laughing gas' and used as a mild anesthetic in clinical medicine?
  19. Which gas is a toxic, colorless byproduct of incomplete combustion that binds to hemoglobin with ~200 times higher affinity than oxygen?
  20. What is the hybrid state and spatial shape of the Carbonate ion (CO3 2-)?
  21. What is the hybrid state and shape of the Sulfate ion (SO4 2-)?
  22. Which compound is used as a clinical radio-contrast agent for gastrointestinal X-ray imaging because of its total water insolubility?
  23. Which property of water accounts for its ability to moderate body temperature during strenuous physiological exercise?
  24. What is the chemical composition of plaster of Paris used for orthopedic bone fracture casts?
  25. Which element exhibits the allotropes Diamond, Graphite, and Fullerenes?
  26. Why is Graphite an electrical conductor while Diamond is an electrical insulator?
  27. What is the shape and bond angle of the Ozone molecule (O3)?
  28. What type of hybridization is exhibited by the central Boron atom in Boric acid (H3BO3 or B(OH)3)?
  29. What is the formal charge of the central Nitrogen atom in the Nitrite ion (NO2-)? (Hard)
  30. Which compound exhibits coordinate covalent bonding in addition to ionic and covalent bonding?
  31. What is the oxidation number of Iron in Potassium Ferricyanide K3[Fe(CN)6]?
  32. What is the oxidation number of Iron in Potassium Ferrocyanide K4[Fe(CN)6]?
  33. Which property of heavy metals explains why Lead, Mercury, and Cadmium act as potent non-competitive enzyme inhibitors in the human body? (Hard)
  34. What is the geometry and bond angle of the Carbon Dioxide (CO2) molecule?
  35. Which intermolecular force accounts for the liquefaction of non-polar noble gases like Helium and Argon at cryogenic temperatures?

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