Free Transition Elements MCQs with Answers
531 Transition Elements MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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Read the Transition Elements notesFree MDCAT chapter notes with key terms531 questions · page 7 of 27
- A. Fluorine is restricted to -1 oxidation state
- B. The correct answer is (b) fluorine follows octet rule and as well as extended octet rule.
- C. Fluorine has the lowest dissociation energy among the halogens
- D. both b& c
Explanation: Incorrect statement:Fluorine cannot break the octet rule: It lacks d-orbitals in its valence shell, so it cannot accommodate more than 8…
Correct answer: The correct answer is (b) fluorine follows octet rule and as well as extended octet rule.- A. F2
- B. Cl2
- C. Br2
- D. Iodine
Explanation: Van der Waals forces generally increase as the size of the molecule increases.
Correct answer: Iodine- A. F₂ (Fluorine gas)
- B. Cl₂ (Chlorine gas)
- C. Br₂ (Bromine gas)
- D. I₂ (Iodine)
Explanation: Fluorine's exceptional reactivity: Among the halogens, only fluorine gas (F₂) is powerful enough to react directly with gold under normal…
Correct answer: F₂ (Fluorine gas)- A. Xe
- B. Kr
- C. Rn
- D. All of the above.
Explanation: Fluorine's exceptional reactivity:Fluorine is the most reactive element in the entire periodic table.
Correct answer: All of the above.- A. XeF4
- B. XeOF4
- C. XeOF2
- D. NaXeO6.
Explanation: Sodium is +1 and each oxygen has -2. Xenon's oxidation state is +6 (1 x +1 + 6 x -2 = -12).Therefore, only NaXeO6 has xenon with an…
Correct answer: NaXeO6.- A. Cl2
- B. I2 is a volatile solid
- C. Br2
- D. Cl2 is insoluble in water
Explanation: Iodine (I2) is a volatile solid. At room temperature, iodine sublimes directly from a solid to a purple-colored gas without passing…
Correct answer: I2 is a volatile solid- A. Small size
- B. High nuclear charge
- C. Both a and b
- D. No authorized justification yet
Explanation: Combining the effects of small size and high nuclear charge provides a more complete explanation.
Correct answer: Both a and b- A. 1s22s22p3
- B. 1s22s22p63s23p1
- C. 1s22s22p4
- D. 1s22s22p63s23p64s23d1
Explanation: (d) 1s2 2s2 2p6 3s2 3p6 4s2 3d1: This configuration includes a partially filled 3d orbital, which is not a characteristic of Group IIA…
Correct answer: 1s22s22p63s23p64s23d1- A. 4
- B. 2
- C. 1
- D. 6
Explanation: In the network of silica (SiO2), each silicon atom is surrounded by (a) 4 oxygen atoms.Therefore, remembering the basic stoichiometry of…
Correct answer: 4- A. 26%
- B. 37%
- C. 27%
- D. < 2.6%
Explanation: Orthoboric acid's solubility in water varies with temperature. At 40°C, it's given as 2.6%.
Correct answer: 37%- A. carbon is non-metal while silicon is semi-metal
- B. CO3 is an independent molecule while Si02 has network covalent structure
- C. CO2 forms multiple bond while silicon does not form multiple bonds
- D. Silicon has all sigma bonds.
Explanation: While all the listed options contain some truths about the differences between CO2 and SiO2, only one accurately explains their…
Correct answer: CO3 is an independent molecule while Si02 has network covalent structure- A. Al2O3.2H20
- B. Na3AlF6
- C. A2O3.3H20
- D. Al2O3.H20
Explanation: Among the options you provided, the chief ore of aluminum is:(d) Al2O3.H2OThis is the chemical formula for hydrated alumina, also known as…
Correct answer: Al2O3.H20- A. Pb20
- B. Pb2O4
- C. PbO2
- D. All of the above
Explanation: Litharge (PbO) is the most common and stable oxide of lead in its lower oxidation state (+2).
Correct answer: Pb20- A. Beryllium
- B. Carbon
- C. Silicon
- D. Aluminium
Explanation: Aluminium: Aluminium commonly forms a tripositive ion (Al³⁺) by losing three electrons.Therefore, the correct answer to the question…
Correct answer: Aluminium- A. Increases on dilution slightly
- B. Does not change on dilution
- C. Decreases on dilution
- D. Depends on density of electrolyte itself
Explanation: When a strong electrolyte (a compound that completely dissociates into ions in solution) is diluted, the number of ions per unit volume…
Correct answer: Decreases on dilution- A. It lies above in electrochemical series
- B. It lies below in the electrochemical series
- C. Cannot replace
- D. None
Explanation: The electrochemical series is a list of metals arranged in order of their standard electrode potentials.
Correct answer: It lies above in electrochemical series- A. Presence of unpaired electron in atom and molecule
- B. Weakly attracted by strong magnetic field
- C. Weakly repelled by strong magnetic field
- D. Both A and B are correct
Explanation: Overall, option D (Both A and B are correct) accurately describes the true statements about the paramagnetic property of transition…
Correct answer: Both A and B are correct- A. More carbon content in cutting tools
- B. More iron content in cutting tools
- C. More sulphur and phosphorous content in cutting tools
- D. None of the above options
Explanation: Tubes made of steel can be hammered while hot because they typically have a lower carbon content compared to cutting tools made of steel.
Correct answer: More carbon content in cutting tools- A. Electrons are tightly held by sigma bond in alkanes, thus less reactive
- B. Electrons cloud away from nuclei due to pi bond in alkenes, thus more reactive
- C. Pi bonds make alkenes reactive to electrophilic reagents
- D. All of the above
Explanation: Alkanes are less reactive compared to alkenes primarily because of the nature of the bonds present in their molecular structure.
Correct answer: Electrons are tightly held by sigma bond in alkanes, thus less reactive- A. They decompose when heated
- B. Become hard on heating and cannot be softened again
- C. Can be softened on heating and hardened when cooled with drastically different properties fromoriginal
- D. Can be softened repeatedly on heating and hardened when cooled with little change in property
Explanation: Polymers used in PVC pipes exhibit the property of thermoplasticity, which means they can be softened upon heating and hardened upon…
Correct answer: Can be softened repeatedly on heating and hardened when cooled with little change in property