d-and f-Block Elements

Iridium ($Ir$) is located in which group of the d-block?

To which block does Promethium ($Pm$) belong?

In which period is the element Cadmium ($Cd$) found?

Cadmium ($Cd$) is located in which group of the periodic table?

The transition series that follows the filling of $3d$ orbitals is located in which period?

The elements in Group 12 of the periodic table are:

Which group number corresponds to the element with atomic number $Z=21$?

The element with atomic number $Z = 112$ (Copernicium) is the last member of which transition series?

If an element is located in Group 10 and Period 4, what is its electronic configuration?

An element with the outer configuration $5d^1 6s^2$ belongs to which group and period?

Which of the following transition metals is used as a catalyst in the hydrogenation of oils?

The oxidation state of Vanadium in $V_2O_5$ is:

Which of the following ions has the maximum number of unpaired electrons?

Which element in the $3d$ series has the configuration $3d^{10} 4s^2$?

The transition element that does not show any oxidation state other than $+3$ is:

Which transition metal ion has a spin-only magnetic moment of $3.87 \text{ BM}$?

Which of the following ions is paramagnetic?

The property of transition metals to form alloys is based on the fact that:

The catalyst used in the polymerization of ethene (Ziegler-Natta catalyst) is a combination of:

Which of the following ions will have the same number of unpaired electrons as $Fe^{2+}$?

What is the oxidation state of Manganese in the Permanganate ion ($MnO_4^-$)?

What is the equivalent weight of $KMnO_4$ in a neutral medium? (Molecular weight = $M$)

What happens to the color of a $KMnO_4$ solution when it is added to an acidified solution of $FeSO_4$?

Which of the following is the correct formula of Potassium Manganate?

Potassium permanganate ($KMnO_4$) acts as a strong oxidizing agent in acidic medium. During the titration of acidified $KMnO_4$ with ferrous oxalate ($FeC_2O_4$), how many moles of $FeC_2O_4$ are oxidized by 1 mole of $KMnO_4$?

What happens to the oxidation state of Chromium when $NaOH$ is added to an orange solution of $K_2Cr_2O_7$?

The product obtained when $Mn_2O_7$ (manganese heptoxide) reacts with water is:

What is the primary reason that $K_2Cr_2O_7$ is used as a primary standard in volumetric analysis while $KMnO_4$ is not?

In the reaction $2KMnO_4 + 3H_2SO_4 + 5H_2O_2 \rightarrow K_2SO_4 + 2MnSO_4 + 8H_2O + 5O_2$, the $O_2$ gas is evolved from:

Why does $KMnO_4$ exhibit a higher melting point compared to other transition metal oxo-salts in the same period?

The chemical behavior of lanthanoids is very similar to which of the following groups?

How many unpaired electrons are present in the $Lu^{3+}$ ion ($Z=71$)?

Which of the following lanthanoid ions has the largest ionic radius?

Which of these is a typical use of lanthanoid oxides?

Which of the following properties is shared by all lanthanoids?

Mischmetall is often alloyed with magnesium to produce:

Which of the following factors is the primary cause of the Lanthanoid contraction?

The separation of lanthanoids by solvent extraction often uses which of the following organic solvents/reagents?

Which of the following trivalent lanthanoid ions is expected to show the strongest absorption in the visible region (deepest color)?

What is the primary product when a lanthanoid metal ($Ln$) reacts with water?

Actinoids are also referred to as:

Which of the following oxidation states is the most common for the later actinoids (elements towards the end of the series)?

Which actinoid element was named after the creator of the periodic table?

Which of the following represents the correct decreasing order of the shielding effect of orbitals?

Which actinoid element was the first to be discovered through artificial transmutation?

What is the oxidation state of Plutonium in the compound $PuO_2$?

The number of $5f$ electrons in the $Am^{3+}$ ion ($Z = 95$) is:

In the comparison of hydration enthalpies of $M^{3+}$ ions, the values for actinoids are slightly more exothermic than for lanthanoids of similar size. This can be explained by:

The electronic configuration of Lawrencium ($Z = 103$) is $[Rn] 5f^{14} 7s^2 7p^1$ rather than $[Rn] 5f^{14} 6d^1 7s^2$. This is due to:

Which actinoid is used as a portable source of neutrons (by mixing with Beryllium) for neutron activation analysis?

In the disproportionation of the manganate ion in acidic solution, the products are:

What is the oxidation state of Chromium in the red vapors of Chromyl Chloride?

Potassium dichromate reacts with oxalic acid in acidic medium to produce:

Which oxide of Titanium is used extensively in the pigment industry due to its high opacity?

Which statement is incorrect about $K_2Cr_2O_7$?

The bond between Manganese and Oxygen in $MnO_4^-$ involves:

The transition metal ion that forms the most acidic oxide among the first transition series is:

The green color of $Cr_2O_3$ is used as a pigment. It is chemically very stable because:

How many oxygen atoms are shared between the two tetrahedra in the $Cr_2O_7^{2-}$ ion?

Which of the following d-block oxides has the highest melting point and is often used in high-temperature crucibles?

Lanthanoid contraction is unique because it involves the filling of:

The total decrease in the atomic radius from $La$ to $Lu$ is approximately:

What is the reason for the decrease in basicity of lanthanoid hydroxides?

Which of the following lanthanoid ions is colorless?

While the $Ln^{3+}$ ionic radii show a smooth and steady decrease across the series, the atomic (metallic) radii of neutral lanthanoids show distinct 'peaks' or higher values for Europium ($Z=63$) and Ytterbium ($Z=70$). What is the primary reason for these anomalies?

The lanthanoid contraction causes the atomic radii of the $5d$ transition elements to be nearly identical to those of the $4d$ elements. Which of the following sequences correctly illustrates the underlying mechanism leading to this effect?

Which of the following ions has the highest degree of hydration among lanthanoids?

How does lanthanoid contraction explain the similarity in the properties of $Y$ (Yttrium, $Z=39$) and heavy lanthanoids like $Tb$ to $Lu$?

What happens to the $Z_{eff}$ (Effective Nuclear Charge) acting on the $6s^2$ electrons as we move from $Ce$ to $Lu$?

Which of the following factors does NOT contribute to the lanthanoid contraction?

Which of the following is an application of d-block elements in the medical field for sterilizing surgical instruments?

Which metal is used as a shielding material for high-energy radiation?

Which d-block element is used as a catalyst in the decomposition of potassium chlorate ($KClO_3$)?

Which transition metal is primarily used for making electrical cables due to its high electrical conductivity?

Which d-block element is a component of 'Wood's metal', a low-melting alloy used in fire sprinklers?

The alloy 'Invar' contains iron and nickel. It is used in making precision instruments primarily because of its:

Chromium compounds like $PbCrO_4$ (Chrome yellow) are used in the industry as:

Which d-block element is used as a heterogeneous catalyst in the 'Fischer-Tropsch' synthesis of hydrocarbons?

The use of 'Mischmetal' in making alloys for magnesium-based radiator grills is intended to improve:

In the 'Thermite Process' for welding rail tracks, which d-block oxide is reduced by Aluminum?