In the following transition metals, the maximum number of oxidation states are exhibited by
- chromium (Z = 24)
- manganese (Z = 25)
- iron (Z = 26)
- titanium (Z = 22)
The Correct Option is B
Solution and Explanation
Other metals show the following oxidation states $Cr = +2 +3 +4 +5 +6 , Fe = +2 +3$ and $Ti = +2 +3 + 4$
Top NEET Chemistry Questions
Which of the following statements are true?
A. Unlike Ga that has a very high melting point, Cs has a very low melting point.
B. On Pauling scale, the electronegativity values of N and C are not the same.
C. $Ar, K^{+}, Cl^{–}, Ca^{2+} and S^{2–}$ are all isoelectronic species.
D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is Si $>$ Al $>$ Mg $>$ Na.
E. The atomic radius of Cs is greater than that of Li and Rb.
Choose the correct answer from the options given below:- NEET (UG) - 2025
- Chemistry
- Inorganic chemistry
- Given below are two statements:
Statement I: Like nitrogen that can form ammonia, arsenic can form arsine.
Statement II: Antimony cannot form antimony pentoxide.
In the light of the above statements, choose the most appropriate answer from the options given below:- NEET (UG) - 2025
- Chemistry
- Inorganic chemistry
For the reaction A(g) $\rightleftharpoons$ 2B(g), the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500, at 1000 K.
[Given: R = 0.0831 atm $mol^{–1} K^{–1}$]
$K_p$ for the reaction at 1000 K is:- NEET (UG) - 2025
- Chemistry
- Law Of Chemical Equilibrium And Equilibrium Constant
Among the following, choose the ones with an equal number of atoms.
- 212 g of Na2CO3 (s) [molar mass = 106 g]
- 248 g of NaNO3 (s) [molar mass = 62 g]
- 240 g of NaOH (s) [molar mass = 40 g]
- 12 g of H2 (g) [molar mass = 2 g]
- 220 g of CO2 (g) [molar mass = 44 g]
Choose the correct answer from the options given below:
- NEET (UG) - 2025
- Chemistry
- Stoichiometry and Stoichiometric Calculations
Identify the suitable reagent for the following conversion: $Ph-C(=O)-OCH_3$ $\longrightarrow$ $Ph-CHO$
- NEET (UG) - 2025
- Chemistry
- Organic Chemistry
Top NEET d -and f -Block Elements Questions
- Zr (Z=40) and Hf (Z=72) have similar atomic and ionic radii because of
- NEET (UG) - 2021
- Chemistry
- d -and f -Block Elements
- Match List-I with List-II. Choose the correct answer from the options given below.
- NEET (UG) - 2021
- Chemistry
- d -and f -Block Elements
- When neutral or faintly alkaline KMnO4 is treated with potassium iodide, iodide ion is converted into 'X'. 'X' is -
- NEET (UG) - 2019
- Chemistry
- d -and f -Block Elements
- Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :
Column I Column II a. $Co^{3+}$ i. $\sqrt{8} B.M$ b. $Cr^{3+}$ 11. $\sqrt{35} B.M$ c. $Fe^{3+}$ iii. $\sqrt{3} B.M$ d $Ni^{2+}$ iv $\sqrt{24} B.M$ v $\sqrt{15} B.M$ - NEET (UG) - 2018
- Chemistry
- d -and f -Block Elements
- Which one of the following ions exhibits $d-d$ transition and paramagnetism as well ?
- NEET (UG) - 2018
- Chemistry
- d -and f -Block Elements
Top NEET Questions
- Which of the following enzyme(s) are NOT essential for gene cloning?
A. Restriction enzymes
B. DNA ligase
C. DNA mutase
D. DNA recombinase
E. DNA polymerase- NEET (UG) - 2025
- Molecular Biology
A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :
- NEET (UG) - 2025
- Current electricity
- Frogs respire in water by skin and buccal cavity and on land by skin, buccal cavity and lungs.
- NEET (UG) - 2025
- Animal Physiology
Which of the following statements are true?
A. Unlike Ga that has a very high melting point, Cs has a very low melting point.
B. On Pauling scale, the electronegativity values of N and C are not the same.
C. $Ar, K^{+}, Cl^{–}, Ca^{2+} and S^{2–}$ are all isoelectronic species.
D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is Si $>$ Al $>$ Mg $>$ Na.
E. The atomic radius of Cs is greater than that of Li and Rb.
Choose the correct answer from the options given below:- NEET (UG) - 2025
- Inorganic chemistry
AB is a part of an electrical circuit (see figure). The potential difference \(V_A - V_B\), at the instant when current \(i = 2\) A and is increasing at a rate of 1 amp/second is:
- NEET (UG) - 2025
- Electromagnetic Induction and Inductance
Concepts Used:
D and F Block Elements
The d-block elements are placed in groups 3-12 and F-block elements with 4f and 5f orbital filled progressively. The general electronic configuration of d block elements and f- block elements are (n-1) d 1-10 ns 1-2 and (n-2) f 1-14 (n-1) d1 ns2 respectively. They are commonly known as transition elements because they exhibit multiple oxidation states because of the d-d transition which is possible by the availability of vacant d orbitals in these elements.
They have variable Oxidation States as well as are good catalysts because they provide a large surface area for the absorption of reaction. They show variable oxidation states to form intermediate with reactants easily. They are mostly lanthanoids and show lanthanoid contraction. Since differentiating electrons enter in an anti-penultimate f subshell. Therefore, these elements are also called inner transition elements.
Read More: The d and f block elements