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 11 of 27
- A. 1
- B. 2
- C. 4
- D. 5
Explanation: The ferrous ion, Fe²⁺, has the electron configuration [Ar]3d⁶. In the 3d subshell, there are 4 unpaired electrons.
Correct answer: 4- A. Zn
- B. Sn
- C. Ni
- D. Any of the above
Explanation: This option indicates that all of the listed elements-zinc, tin, and nickel-can be used to coat iron surfaces for the purpose of…
Correct answer: Any of the above- A. Transition elements have low melting points
- B. Transition elements do not have catalytic activity
- C. Transition elements exhibit variable oxidation states
- D. Transition elements exhibit inert pair effect
Explanation: Transition elements exhibit variable oxidation states: This statement is correct.
Correct answer: Transition elements exhibit variable oxidation states- A. 10
- B. 14
- C. 28
- D. 30
Explanation: This is the correct option because inner transition elements are those elements that have their outermost electrons in the f orbitals.
Correct answer: 28- A. 5
- B. 4
- C. 3
- D. 2
Explanation: A is correct because Mn2+ (Z=25) has a 3d5 electron configuration. In a d5 configuration, there are 5 electrons in the d orbital, and…
Correct answer: 5- A. 5
- B. 6
- C. 3
- D. 4
Explanation: When Fe loses three electrons to form Fe3+, it loses its 4s2 and one 3d electron, leaving behind five unpaired electrons in the 3d orbitals.
Correct answer: 5- A. CaSiO3
- B. FeSiO3
- C. MnSiO3
- D. All
Explanation: This option of all is correct because during the steelmaking process, various oxides such as CaO, FeO, MnO, SiO2, and others are present…
Correct answer: All- A. 10
- B. 5
- C. 6
- D. 2
Explanation: The correct answer is option B, 5. This is because the balanced chemical equation for the reaction between acidified FeSO4 solution and…
Correct answer: 5209. An element in +3 oxidation state has the electronic configuration (Ar)3d3. Its atomic number is:
- A. 24
- B. 23
- C. 22
- D. 21
Explanation: The element with atomic number 24 is chromium (Cr), which has an electronic configuration of (Ar) 3d5 4s1.
Correct answer: 24- A. Zn, Cd, Hg
- B. Fe, Fu, Os
- C. Cr, Mo, W
- D. Mn, Te, Re
Explanation: Chromium (Cr), molybdenum (Mo), and tungsten (W) belong to Group VI B of transition elements.
Correct answer: Cr, Mo, W- A. Cr2OCl2
- B. CrO2Cl2
- C. Cr2OCl3
- D. CrOCl2
Explanation: This is the correct formula for chromyl chloride. It consists of one chromium atom, two oxygen atoms, and two chlorine atoms.
Correct answer: CrO2Cl2- A. Octahedral
- B. Square planar
- C. Tetrahedral
- D. Trigonal bipyramidal
Explanation: In PCl5, phosphorus pentachloride, the central phosphorus atom is surrounded by five chlorine atoms.
Correct answer: Trigonal bipyramidal- A. I-A
- B. I-B
- C. II-A
- D. II-B
Explanation: The coinage metals, also known as Group 11 elements, consist of copper (Cu), silver (Ag), and gold (Au).
Correct answer: I-B- A. sp
- B. dsp2
- C. spd2
- D. dsp3
Explanation: Phosphorus pentachloride (PCl5) has a dsp hybridization. In dsp hybridization, one s orbital, one d orbital, and three p orbitals are…
Correct answer: dsp3- A. Fe2O3
- B. Fe3O4
- C. FeO
- D. Fe2O3.3H2O
Explanation: This is the correct chemical formula for hematite. Hematite is composed of iron (Fe) and oxygen (O) atoms in a 2:3 ratio, so the formula…
Correct answer: Fe2O3- A. 2
- B. 3
- C. 6
- D. 7
Explanation: Option a suggests that there are two types of ligands in the complex. In [PtCl(NO2)(NH3)4]-2, the ligands present are chloride (Cl-) and…
Correct answer: 2- A. Zinc
- B. Iron
- C. Scandium
- D. Copper
Explanation: Iron is paramagnetic because it has unpaired electrons in its d orbitals, which align with an external magnetic field, causing it to be…
Correct answer: Iron- A. Wrought iron
- B. Pig iron
- C. Cast iron
- D. Steel
Explanation: Wrought iron contains very low carbon content (less than 0.08%) and is known for its fibrous structure, making it highly malleable and…
Correct answer: Wrought iron- A. Coordination number
- B. Coordination sphere
- C. Chelates
- D. None of these
Explanation: Option b is the correct answer. It refers to the central metal atom/ion along with its attached ligands in a coordination complex.
Correct answer: Coordination sphere- A. 0.1 to 0.2%
- B. 0.2 to 0.7%
- C. 0.2 to 0.6%
- D. 0.1 to 0.6%
Explanation: Mild steel with a carbon content ranging from 0.1% to 0.2% is characterized by its relatively low carbon content, making it softer and…
Correct answer: 0.1 to 0.2%