d and f Block Elements

In the following reactions, ZnO is respectively acting as a/an :
(a) ZnO + Na2O \(\to\) Na2ZnO2
(b) ZnO + CO2 \(\to\) ZnCO3

Which one of the following species is stable in aqueous solution?

The transition metal ions responsible for color in ruby and emerald are,
respectively :

Which of the following compounds is metallic and ferromagnetic ?

The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :

Match the catalysts to the correct processes :

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The colour of KMnO4 is due to :

Which series of reactions correctly represents chemical relations related to iron and its compound?

Four successive members of the first row transition elements are listed below with atomic numbers. Which
one of them is expected to have the highest \(E_{{M^{3 + }}/{M^{2 + }}}^0\) value?

Which of the following arrangements does not represent the correct order of the property stated against it?

Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect?

In context of the lanthanoids, which of the following statements is not correct?

The outer electron configuration of \(Gd\) (Atomic No. \(64\)) is :

Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the
following statements is incorrect?

In context with the transition elements, which of the following statements is incorrect ?

Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the
main reason being :

Amount of oxalic acid present in a solution can be determined by its titration with \(KMn{O_4}\) solution in the presence of \({H_2}S{O_4}.\) The titration gives unsatisfactory result when carried out in the presence of \(HCl,\) because $$...

Identify the incorrect statement among the following :

The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is
because :

Lanthanoid contraction is caused due to :

A metal, \(M\) forms chlorides in its \(+2\) and \(+4\) oxidation states. Which of the following statements about these chlorides is correct?

The “spin-only” magnetic moment [in units of Bohr magneton, (µB)] of Ni2+ in aqueous solution would
be : (Atomic number of Ni = 28)

The oxidation state of chromium in the final product formed the reaction between \(K{\rm I}\) and acidified potassium dichromate solution is :

Calomel \(\left( {H{g_2}C{l_2}} \right)\) on reaction with ammonium hydroxide gives :

On heating mixture of \(C{u_2}O\) and \(C{u_2}S\) will give :

The lanthanide contraction is responsible for the fact that :

Which of the following factors may be regarded as the main cause of lanthanide
contraction?

Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

Cerium (Z = 58) is an important member of the lanthanoids. Which of the following
statements about cerium is incorrect?

Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction?

Which one of the following nitrates will leave behind a metal on strong heating?

The number of d-electrons retained in Fe2+ (At no of Fe = 26) ion is :

The atomic numbers of vanadium (V), Chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26. Which one of these may be expected to have the highest second ionization enthalpy?

What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?

A red solid is insolvable in water. However it becomes soluble if some \(K{\rm I}\) is added to water. Heating the red solid in a test tube results in liberation of some violet colored fumes and droplets of a metal appear on the cooler part...

The radius of La3+ (Atomic number of La = 57) is 1.06 Å. Which one of the following given values will be
closest to the radius of Lu3+ (Atomic number of Lu = 71) ?

For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass
over a liquid metal which does not solidify before glass. The metal used can be :

Which one of the following statements is correct?

Most common oxidation states of Ce (cerium) are :

Which of the following ions has the maximum magnetic moment?

When KMnO4 acts as an oxidising agent and ultimately forms [MnO4]-2, MnO2, Mn2O3, Mn+2
then the number of electrons transferred in each case respectively is :

How do we differentiate between Fe3+ and Cr3+ in group III?