Last seen: May 1, 2022
Potassium dichromate is prepared from chromite ore (FeCr2O4) in the following steps. Step (1): Preparation of sodium chromate 4FeCr2O4 + 16NaOH + ...
In transition elements, the oxidation state can vary from +1 to the highest oxidation state by removing all its valence electrons. Also, in transition...
Transition metals are large in size and contain lots of interstitial sites. Transition elements can trap atoms of other elements (that have small atom...
(i) Transition metals show paramagnetic behaviour. Paramagnetism arises due to the presence of unpaired electrons with each electron having a magnetic...
In the lanthanide series, +3 oxidation state is most common i.e., Ln(III) compounds are predominant. However, +2 and +4 oxidation states can also be f...
Transition metals have a partially filled d-orbital. Therefore, the electronic configuration of transition elements is (n - 1)d1-10ns0-2. The non-tr...
Transition elements are those elements in which the atoms or ions (in stable oxidation state) contain partially filled d orbital. These elements lie i...
As we move along the lanthanoid series, the atomic number increases gradually by one. This means that the number of electrons and protons present in a...
(i) Vanadate, VO3- Oxidation state of V is +5. (ii) Chromate, CrO42- Oxidation state of Cr is +6. (iii) Permanganate, MnO3- Oxidation state ...
The elements in the first-half of the transition series exhibit many oxidation states with Mn exhibiting maximum number of oxidation states (+2 to +7)...
The oxidation states displayed by the first half of the first row of transition metals are given in the table below. figure.png It can be easil...
Electronic configuration of Mn2+ is [Ar]18 3d5. Electronic configuration of Fe2+ is [Ar]18 3d6. It is known that half-filled and fully-filled or...
(i) Cr3++: 1s22s22p63s23p63d3 Or, [Ar]18 3d3 (ii) Pm3+: 1s22s22p63s23p63d104s24p64d105s25p64f4 Or, [Xe]54 3d3 (iii) Cu+: 1s22s22p63s23p63d10 ...
In actinoids, 5f orbitals are filled. These 5f orbitals have a poorer shielding effect than 4f orbitals (in lanthanoids). Thus, the effective nuclear ...
In an aqueous medium, Cu2+ is more stable than Cu+. This is because although energy is required to remove one electron from Cu+ to Cu2+, high hydratio...
Z = 27 ⇒ [Ar] 3d74s2 ∴ M2+ = [Ar] 3d2 3d7 = figure.png i.e., 3 unpaired electrons ∴ n = 3 ⇒ = μ ⇒ = μ ⇒ = μ = 3.87 B.M
The following reactions are involved when Cr2+ and Fe2+ act as reducing agents. Cr2+ → Cr3+ Fe2+ → Fe3+ The Eo Cr3+/Cr2+ value is - 0.41 V and E...
Both oxide and fluoride ions are highly electronegative and have a very small size. Due to these properties, they are able to oxidize the metal to its...
Ionization enthalpies are found to increase in the given series due to a continuous filling of the inner d-orbitals. The irregular variations of ioniz...
The Eθ (M2+/M) value of a metal depends on the energy changes involved in the following: 1. Sublimation: The energy required for converting one mole...