intro
MCQs 1:
Which elements from the following list can be absorbed into the interstitial spaces of transition elements?
i. Hydrogen ii. Carbon iii. Nitrogen
Topic: Interstitial Compounds in Transition Elements
Correct Answer: D) All of the above
- Interstitial compounds or alloys are created when an atom of small enough size occupies an interstitial gap in a metal lattice.
- Elements such as Hydrogen, Carbon, and Nitrogen are prime examples of small atoms that can fit into these interstitial gaps.
- Industrial scenarios often utilize these compounds, especially certain transition metal carbides and nitrides.
- Therefore, the correct answer is D, "All of the above", as all the given elements (Hydrogen, Carbon, and Nitrogen) have the potential to be absorbed into the interstitial spaces of transition elements.
MCQs 2:
Which orbital primarily determines the valency of transition elements?
Topic: Valency Determination in Transition Elements
Correct Answer: C) d-block
- The d-block elements, also known as transition elements, derive their title from the fact that their valency is determined predominantly by the d orbital.
- Therefore, the correct answer is C, "d-block".
MCQs 3:
Which series of transition metal ions all share a 3d2 electronic configuration?
Topic: Electronic Configuration in Transition Metal Ions
Correct Answer: C) Ti2+, V3+, Cr4+, Mn5+
- When observing the electronic configuration of the given series of transition metal ions, we find that Ti2+, V3+, Cr4+, Mn5+ all share a 3d2 configuration.
- Therefore, the correct answer is C, "Ti2+, V3+, Cr4+, Mn5+".
MCQs 4:
Which of the following is a typical transition element?
Topic: Typical Transition Elements
Correct Answer: C) Co
- Out of the given options, Co (cobalt) is the typical transition element. It exhibits all the specific properties associated with the transition elements.
- Therefore, the correct answer is C, "Co".
MCQs 5:
Out of the following transition elements, which one has the lowest melting point?
Topic: Melting Point in Transition Elements
Correct Answer: A) Zn
- The melting point of transition elements is influenced by the binding energy, which is in turn dependent on the number of unpaired electrons.
- Among the transition elements given, Zn (Zinc) has no unpaired electrons, resulting in lower binding energy.
- Consequently, Zn has the lowest melting point amongst the given options.
- Therefore, the correct answer is A, "Zn".
MCQs 6:
Which statement about transition metals is not accurate?
Topic: Characteristics of Transition Metals
Correct Answer: A) All of their ions are colorless.
- Transition metals are renowned for their unique characteristics including variable oxidation states, partially filled d-orbitals, and complex formation.
- However, the statement "All of their ions are colorless" is not accurate. In fact, most of the ions of transition metals are colored due to their unpaired electrons.
- Therefore, the correct answer is A, "All of their ions are colorless".
MCQs 7:
Which of the following contains the lowest percentage of carbon?
Topic: Carbon Content in Iron Variants
Correct Answer: A) Wrought iron
- The carbon content varies in different forms of iron, influencing their properties.
- Wrought iron, known for its purity in commercial forms of iron, has the lowest percentage of carbon among the given options.
- Therefore, the correct answer is A, "Wrought iron".
Question 8:
Why do Cr and Cu have half-filled s-orbitals?
Topic: Electronic Configuration of Transition Elements
Correct Answer: C) This configuration provides stability to the d-orbitals.
- While evaluating the electronic configuration of Cr and Cu, one can observe that they have half-filled s-orbitals.
- This unique configuration is not due to them belonging to the s-block elements or being alkali or alkaline earth metals.
- Rather, the half-filled s-orbitals provide stability to the d-orbitals, contributing to their unique properties.
- Therefore, the correct answer is C, "This configuration provides stability to the d-orbitals".
Question 9:
Which property of transition elements varies according to a regular pattern?
Topic: Properties of Transition Elements
Correct Answer: A) Binding energy
- All the listed properties are associated with transition elements. However, not all of them vary in a predictable pattern.
- The binding energy of transition elements is known to change regularly from left to right in the periodic table.
- Therefore, the correct answer is A, "Binding energy".
Question 10:
Which pair of transition elements exhibit unusual electronic configurations?
Topic: Electronic Configuration Anomalies in Transition Elements
Correct Answer: C) Cu and Cr
- Certain transition elements, such as Cu and Cr, exhibit unusual electronic configurations.
- Unlike most transition elements, the 4s orbitals of Cu and Cr are half-filled.
- Therefore, the correct answer is C, "Cu and Cr".
Question 11:
What is the correct outer electronic configuration of transition elements?
Topic: Electronic Configuration of Transition Elements
Correct Answer: C) (n – 1)s2np6(n – 1)d1-10ns1,2
- Outer electronic configuration of transition elements varies, but one formula accurately represents this configuration.
- (n – 1)s2np6(n – 1)d1-10ns1,2 is the correct electronic configuration, emphasizing the unique orbital filling of transition elements.
- Therefore, the correct answer is C, "(n – 1)s2np6(n – 1)d1-10ns1,2".
Question 12:
What is another name for f-block elements?
Topic: Classification of Transition Elements
Correct Answer: B) Inner transition elements
- F-block elements occupy a specific position in the periodic table and are known by a particular name.
- They are also called inner transition elements, distinguishing them from other transition elements.
- Therefore, the correct answer is B, "Inner transition elements".
Question 13:
Which metal is combined with iron to form stainless steel?
Topic: Composition of Alloys
Correct Answer: D) Cr
- Stainless steel is an alloy primarily composed of iron but also contains another crucial metal.
- Among the provided options, Chromium (Cr) is the correct metal, which is combined with iron to form stainless steel.
- Therefore, the correct answer is D, "Cr".
Question 14:
Why can't Zn exhibit variable valency?
Topic: Valency of Transition Elements
Correct Answer: B) Due to its fully filled d-subshell
- Variable valency in elements is typically due to the presence of incompletely filled d or f orbitals.
- In the case of Zn, its d-subshell is complete, hence it's unable to show variable valency.
- Therefore, the correct answer is B, "Due to its fully filled d-subshell".
Question 15:
Which of the following can be a coordination sphere?
Topic: Coordination Chemistry
Correct Answer: D) All of the above
- In coordination compounds, central metal ions are surrounded by a set of molecules or ions, called ligands, which is the coordination sphere.
- A coordination sphere can be cationic, anionic, or neutral depending on the charge of the ligands and the central metal ion.
- Therefore, the correct answer is D, "All of the above".
Question 16:
Which statement about transition metals is incorrect?
Topic: Properties of Transition Metals
Correct Answer: D) They are unable to exhibit variable valency
- Transition metals are characterized by various unique properties, including the ability to form colorful compounds, paramagnetism, and the formation of both ionic and covalent compounds.
- However, the statement that they cannot exhibit variable valency is incorrect as the presence of vacant d orbitals allows for this.
- Therefore, the correct answer is D, "They are unable to exhibit variable valency".
Question 17:
Which block does an outer transition element belong to?
Topic: Classification of Transition Elements
Correct Answer: C) d-block
- Transition elements are divided into inner and outer transition elements based on their electron configurations and their positions in the periodic table.
- Outer transition elements are those whose d orbitals are progressively filled. These elements belong to the d-block.
- Therefore, the correct answer is C, "d-block".
Question 18:
What classifications are applicable to Inner Transition elements?
Topic: Categories of Inner Transition Elements
Correct Answer: A) Lanthanides and Actinides
- Inner transition elements are categorized into two series, based on their atomic numbers and similar properties.
- These include elements 57-71 (lanthanides) and 89-103 (actinides). Both series are typically positioned below the main body of the periodic table.
- Therefore, the correct answer is A, "Lanthanides and Actinides".
Question 19:
Why are Transition elements referred to as such?
Topic: Naming Origins of Transition Elements
Correct Answer: C) Their properties serve as a bridge between the metallic elements of the s block and non-metallic elements of the p block.
- The term 'transition' in transition elements is due to their positioning and behavior in the periodic table.
- These elements bridge or 'transition' between the properties of the s-block (metals) and the p-block (non-metals).
- Therefore, the correct answer is C, "Their properties serve as a bridge between the metallic elements of the s block and non-metallic elements of the p block".
Question 20:
What is the term used to refer to the count of lone pairs of electrons donated by the ligand to the central atom or ion in a complex?
Topic: Understanding Coordination Number
Correct Answer: A) Coordination count
- In the realm of chemistry and crystallography, one often encounters the concept of a 'coordination number’.
- This number refers to the count of the nearest neighbors of a central atom within a molecule or crystal structure.
- The way to determine the coordination number in molecules varies from the method used in crystals.
- Hence, the correct response is A, "Coordination count".
Question 21:
Identify the non-typical transition element amongst the following:
Topic: Identifying non-typical Transition Elements
Correct Answer: A) Zinc (Zn)
- Among the listed elements, Zinc (Zn) stands out as a non-typical transition element.
- This unique status arises from its full outermost d-orbital.
- Zinc does not share many properties with the other transition elements within its family.
- It's important to note that both groups IIB and IIIB contain non-typical transition elements.
- Therefore, the correct answer is A, "Zinc (Zn)".
Question 22:
What property does an atom or molecule exhibit when all its orbitals are completely filled?
Topic: Behaviour of Fully Filled Orbitals
Correct Answer: C) Diamag2tism
- The presence or absence of unpaired electrons profoundly influences the magnetic behaviour of atoms or molecules.
- If unpaired electrons are present, the atom or molecule exhibits paramagnetism.
- On the other hand, if all electrons are paired in an orbital, then magnetic moments cancel each other out and the substance becomes diamagnetic.
- Therefore, the correct answer is C, "Diamag2tism".
Question 23:
Which period in the periodic table contains the 3-d series elements?
Topic: Locating 3-d Series Elements
Correct Answer: B) Fourth period
- The location of elements in the periodic table is essential in understanding their properties, and the 3-d series elements are no exception.
- The 3-d series elements are found in the fourth period of the periodic table.
- Therefore, the correct answer is B, "Fourth period".
Question 24:
Which transition metal ion with the given outer electronic configuration will exhibit the least magnetic moment?
Topic: Understanding Magnetic Moments
Correct Answer: D) 3d9
- The magnetic moment of a transition metal ion is a crucial characteristic that facilitates understanding of its magnetic properties.
- This moment is calculated using the formula √(n(n+2)), where n is the number of unpaired electrons.
- The 3d9 configuration has one unpaired electron, which results in the least magnetic moment compared to the other configurations.
- Therefore, the correct answer is D, "3d9".
Question 25:
Which element marks the end of the first transition series?
Topic: Identifying the End of the First Transition Series
Correct Answer: C) Zinc (Zn)
- The beginning and ending of a transition series are defined by specific elements. For the first transition series, it starts with Scandium (Sc) and ends with Zinc (Zn).
- The positioning of these elements is determined by the arrangement of their outermost electrons in the 3d subshell.
- Therefore, the correct answer is C, "Zinc (Zn)".