D And F Block Elements - Inorganic Chemistry - Chemistry Previous Year Questions

The electronic configuration of Cr\(^{3+}\) is

Formation of coloured solution is possible, when metal ion in the compound contains

Which of the following forms a colourless solution in aqueous medium?

In 3d-transmission series, which one has the least melting point?

An aqueous solution of X on addition of hydrogen peroxide in ice cold conditions gives blue colour to the ethereal layer. Then, X can be

Find the correct matches of the substances, given in Column I, from their characteristic properties given in Column II.

Match the following characteristics of transition metals given in Column I with the examples listed in Column II

Identify the incorrect statement.

The correct order of increasing melting point is

The metallic ions that have almost same spin only magnetic moment are :

(i) \(\mathrm{Co}^{2+}\)

(ii) \(\mathrm{Mn}^{2+}\)

(iii) \(\mathrm{Cr}^{2+}\)

(iv) \(\mathrm{Cr}^{3+}\)

Consider the following statements in respect of lanthanides, which of the statements are incorrect?

(i) \(\mathrm{La}(\mathrm{OH})_3\) is least basic among the hydroxides of lanthanides

(ii) The lanthanide ions \(\mathrm{Yb}^{2+}, \mathrm{Lu}^{3+}\) and \(\mathrm{Ce}^{4+}\) are diamagnetic in nature.

(iii) \(\mathrm{Ce}^{4+}\) can act as an oxidising agent

(iv) \(\operatorname{Ln}\) (III) compounds are generally colourless

(v) Ionic radii of \(\mathrm{Ce}^{3+}\) is greater than \(\mathrm{Yb}^{3+}\)

An inorganic compound \(\mathrm{W}\) undergoes the following reactions:

$$\begin{gathered} W+\frac{\mathrm{Na}_2 \mathrm{CO}_3}{\mathrm{O}_2 / \text { heat }} \rightarrow X+\frac{\mathrm{H}^{+}}{} \rightarrow Y_{(s)} \\ Y(a q)+\mathrm{KCl}(\mathrm{aq}) \rightarrow Z_{(S)} \end{gathered}$$

Z appears in the form of orange crystals and is used as an oxidising agent in acid medium. Identify the compound W.

The Lanthanoid ion which would form coloured compounds is -------------.

Atomic numbers: \(\mathrm{Yb}=70, \quad \mathrm{Lu}=71, \mathrm{Pr}=59, \quad \mathrm{La}=57\)

Identify the correct statement from the following.

Arrange the following ions in the increasing order of their \(\Delta H_{(\text {hydration})}\) values.

$$\mathrm{Cr}^{2+}, \mathrm{Co}^{2+}, \mathrm{Mn}^{2+}, \mathrm{Ni}^{2+}$$

The permanganate ion in acid medium acts as an oxidant and gets converted to its lower oxidation state. What would be the spin only magnetic moment of such reduced manganese ion?

Match the compounds given in Column I with their characteristic features listed in Column II

Choose the incorrect statement from the following

Choose the statements which are incorrect in the case of Lanthanoids.

A. $\mathrm{Ce}^{4+}$ is diamagnetic while $\mathrm{Sm}^{3+}$ is paramagnetic.

B. The atomic size of the transition metals having atomic number greater than 71 are very close to that of the elements above them.

C. Lanthanoids react with hot water forming water soluble $\mathrm{Ln}(\mathrm{OH})_3$ with the liberation of $\mathrm{O}_2$.

D. The general electronic configuration of Lanthanoids is $(n-2) \mathrm{f}^{1-14} 5 \mathrm{~d}^0 6 \mathrm{~s}^2$, where $n=6$.

Which is the correct order of increasing number of unpaired electrons in the following ions?

$$\mathrm{A}=\mathrm{Cr}^{2+}(\mathrm{Z}=24) \mathrm{B}=\mathrm{Cu}^{2+}(\mathrm{Z}=29) \quad \mathrm{C}=\mathrm{Ni}^{2+}(\mathrm{Z}=28) \mathrm{D}=\mathrm{Fe}^{3+}(\mathrm{Z}=26)$$