Which one of the following statements is correct when \ce{SO2} is passed through acidified \ce{K2Cr2O7} solution?
The electronic configurations of Eu (Atomic no. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are:
Which one of the following statements related to lanthanons is incorrect?
The reason for greater range of oxidation states in actinoids is attributed to
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 (a) \ce{Co^3+} (b) \ce{Cr^3+} (c) \ce{Fe^3+} (d) \ce{Ni^2+} Column II (i) $\sqrt{8}$ BM (ii) $\sqrt{35}$ BM (iii) $\sqrt{3}$ BM (iv) $\sqrt{24}$ BM (v) $\sqrt{15}$ BM Choose the correct answer:
Which one of the following ions exhibits d-d transition and paramagnetism as well?
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Which of the following reactions are disproportionation reactions? (a) \ce{2Cu+ -> Cu^2+ + Cu} (b) \ce{3MnO4^2- + 4H+ -> 2MnO4^- + MnO2 + 2H2O} (c) \ce{2KMnO4 -> K2MnO4 + MnO2 + O2} (d) \ce{2MnO4^- + 3Mn^2+ + 2H2O -> 5MnO2 + 4H+} Select the correct option from the following:
The manganate (\ce{MnO4^2-}) and permanganate (\ce{MnO4^-}) ions are tetrahedral, due to:
Identify the incorrect statement.
Match the catalyst with the process: Catalyst (i) \ce{V2O5} (ii) \ce{TiCl4 + Al(CH3)3} (iii) \ce{PdCl2} (iv) Nickel complexes Process (a) The oxidation of ethyne to ethanal (b) Polymerisation of alkynes (c) Oxidation of \ce{SO2} in the manufacture of \ce{H2SO4} (d) Polymerisation of ethylene Which of the following is the correct option?
When neutral or faintly alkaline \ce{KMnO4} is treated with potassium iodide, iodide ion is converted into 'X'. 'X' is
The oxidation state of \ce{Cr} in \ce{CrO5} is:
The calculated spin only magnetic moment of \ce{Cr^2+} ion is:
The calculated 'spin-only' magnetic moment of \ce{Ti^2+} (\ce{3d^2}) is:
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of:
The incorrect statement among the following is:
Gadolinium has a low value of third ionisation enthalpy because of
Given below are half cell reactions: \ce{MnO4^- + 8H+ + 5e^- -> Mn^2+ + 4H2O}, $E^\circ_{(\ce{MnO4^-}/\ce{Mn^2+})} = +1.510$ V \ce{1/2 O2 + 2H+ + 2e^- -> H2O}, $E^\circ_{(\ce{O2}/\ce{H2O})} = +1.223$ V Will the permanganate ion, \ce{MnO4^-}, liberate \ce{O2} from water in the presence of an acid?
In the neutral or faintly alkaline medium, \ce{KMnO4} oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from
The stability of \ce{Cu^2+} salts is more than \ce{Cu^+} salts in aqueous solution due to
Which of the following statements are INCORRECT? A. All the transition metals except scandium form MO oxides which are ionic. B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in \ce{Sc2O3} to \ce{Mn2O7}. C. Basic character increases from \ce{V2O3} to \ce{V2O4} to \ce{V2O5}. D. \ce{V2O4} dissolves in acids to give \ce{VO4^3-} salts. E. \ce{CrO} is basic but \ce{Cr2O3} is amphoteric. Choose the correct answer from the options given below:
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Ionisation enthalpy increases along each series of the transition elements from left to right. However, small variations occur. Reason (R): There is a corresponding increase in nuclear charge which accompanies the filling of electrons in the inner d-orbitals. In the light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Ionisation enthalpies of early actinoids are lower than for early lanthanoids. Reason (R): Electrons are entering 5f orbitals in actinoids which experience greater shielding from nuclear charge. In the light of the above statements, choose the correct answer from the options given below:
'Spin only' magnetic moment is same for which of the following ions? A. \ce{Ti^3+} B. \ce{Cr^2+} C. \ce{Mn^2+} D. \ce{Fe^2+} E. \ce{Sc^3+} Choose the most appropriate answer from the options given below:
The $E^\circ$ value for the \ce{Mn^3+}/\ce{Mn^2+} couple is more positive than that of \ce{Cr^3+}/\ce{Cr^2+} or \ce{Fe^3+}/\ce{Fe^2+} due to the change of
The pair of lanthanoid ions which are diamagnetic is
Given below are two statements: Statement I: Ferromagnetism is considered as an extreme form of paramagnetism. Statement II: The number of unpaired electrons in a \ce{Cr^2+} ion (Z = 24) is the same as that of a \ce{Nd^3+} ion (Z = 60). In the light of the above statements, choose the correct answer from the options given below:
Statement-I: Heating $\ce{NaCl}$ with concentrated $\ce{H2SO4}$ and $\ce{MnO2}$ results in oxidation of Mn. Statement-II: Heating $\ce{NaI}$ with concentrated $\ce{H2SO4}$ and $\ce{MnO2}$ results in reduction of Mn. Choose the most appropriate answer:
Assertion A: Generally, $3d$ transition metals have high melting points. Reason R: Involvement of $3d$-electrons in addition to $4s$-electrons in the interatomic metallic bonding. Choose the most appropriate answer:
The lanthanide ion having four unpaired electrons is: (Atomic numbers: Ce $=58$, Nd $=60$, Tb $=65$, Ho $=67$)
Match List I with List II: List I (Transition metal/compound/complex) (a) \ce{V2O5} (b) \ce{Fe} (c) \ce{PdCl2} (d) Ni complex List II (Catalytic Role) (i) Preparation of ammonia from \ce{N2}/\ce{H2} mixture (ii) Polymerisation of alkynes (iii) Preparation of \ce{H2SO4} and \ce{SO2} (iv) Oxidation of ethyne to ethanal Choose the correct answer from the options given below:
Although the +3 oxidation state is most common in lanthanoids, cerium still shows the +4 oxidation state because:
The green paramagnetic species formed by heating $\ce{KMnO4}$ at $513\,$K is:
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