The pair in which phosphorous atoms have a formal oxidation state of +3 is:
Pyrophosphorous and hypophosphoric acids
Orthophosphorous and hypophosphoric acids
Pyrophosphorous and pyrophosphoric acids
Pyrophosphorous and pyrophosphoric acids
Match the catalysis to the correct processes.
Catalyst | Process |
(A)TiCl3 | (i) Wacker Process |
(B) PdCl2 | (ii) Ziegler -Natta |
(C) CuCl2 | (iii) Contact process |
(D) V2O5 | (iv)Deacon's process |
(A)- (iii), (B)-(ii), (C)-iv, (D)- (i)
(A) - (ii), (B) - (i), (C) -(iv), (D) - (iii)
(A)- (ii), (B)- (iii), (C)- (iv), (D) - (i)
(A)- (ii), (B)- (iii), (C)- (iv), (D) - (i)
The equation which is balanced and represents the correct product(s) is
Li2O + 2KCl → 2LiCl + K2O
[COCl(NH3)5]+ + 5H+ → Co2+
[Mg(H2O)6]2+ + (EDTA)4- [Mg(EDTA)]2+ + 6H2O
[Mg(H2O)6]2+ + (EDTA)4- [Mg(EDTA)]2+ + 6H2O
Which of the following arrangements does not represent the correct order of the property stated against it?
V2+ < Cr2+<Mn2+<Fe2+: paramagnetic behaviour
Ni2+ < Co2+ < Fe2+ < Mn2+ ; Ionic size
Co3+ < Fe3+< Cr3+ < Sc3+ : stability in aqueous solution
Co3+ < Fe3+< Cr3+ < Sc3+ : stability in aqueous solution
Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect?
Ferrous oxide is more basic in nature than the ferric oxide.
Ferrous compounds are relatively more ionic than the corresponding ferric compounds.
Ferrous compounds are less volatile than the corresponding ferric compounds.
Ferrous compounds are less volatile than the corresponding ferric compounds.
The correct order of E°M2+/M values with negative sign for the four successive elements Cr, Mn, Fe and Co is
Cr > Mn > Fe > Co
Mn > Cr > Fe > Co
Cr > Fe > Mn > Co
Cr > Fe > Mn > Co
Sodium salt of an organic acid 'X' produces effervescence with conc. H2SO4. 'X' reacts with the acidified aqueous CaCl2 solution to give a white precipitate which decolourises acidic solution of KMnO4. 'X' is
C6H5COONa
HCOONa
Na2C2O4
Na2C2O4
Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements in incorrect
The ionic sizes of Ln (III) decrease in general with increasing atomic number.
Ln (III) compounds are generally colourless.
Because of the large size of the Ln (III) ions, the bonding in its compounds is predominantly ionic in character
Because of the large size of the Ln (III) ions, the bonding in its compounds is predominantly ionic in character
In context with the transition elements, which of the following statements is incorrect?
In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes.
In the highest oxidation states, the transition metal shows basic character and form cationic complexes.
In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding.
In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding.