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

Assertion (A) In general, transition metals have high melting points.

Reason (R) More number of electrons from ' $(n-1) d^{\prime}$ and ' $n s$ ' are involved in interatomic metallic bonding.

The correct option among the following is

The order of melting points of $\mathrm{Cr}, \mathrm{Mo}$ and W is

Observe the following ions

$$\mathrm{V}^{2+}, \mathrm{Zn}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Fe}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Ti}^{3+}, \mathrm{Sc}^{3+}, \mathrm{Ti}^{4+}, \mathrm{Ni}^{3+}, \mathrm{Co}^{3+}, \mathrm{Cu}^{+}$$

How many ions in the above list have zero magnetic moment?

The product formed during thermal decomposition of ammonium dichromate are

In +2 oxidation state, which of the following lanthanoids act as reducing agents?

Among the following the incorrect statement about transition metals is

Among the following series of transition metal ions, the one in which all the metal ions have $3 d^2, 3 p^6$ electronic configuration is

(Atomic number, $\mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Cr}=24$, $\mathrm{Mn}=25$ )

The highest oxidation state observed in first row transition metals is

Which of the following statement is not true about interstitial complexes?

The increase in the atomic radii of the third (5d) series of transition elements is very small, which may be accounted for the filling of ' $X$ ' orbitals before ${ }^{\prime} Y^{\prime}$ orbitals $X$ and $Y$ are

When permanganate ion is heated at 513 K , led to the formation of two manganese based products. The physical properties of the product in which manganese with the higher oxidation state than the other are

The valency shell electronic configuration of Cr and Cu atoms, respectively, are

Identify all the correct statements for lanthanoide contraction.

(A) The covalent properties of the lanthanoide metal hydroxides increases from La to Lu.

(B) The chemical reactivity decreases from La to Lu.

(C) $\mathrm{La}(\mathrm{OH})_3$ is more basic than $\mathrm{Lu}(\mathrm{OH})_3$.

(D) Zr and Hf have about the same radius.

(E) Separation of lanthanoides from one another is easy.

The correct order of ionic radii of trivalent ions $\mathrm{Y}^{3+}, \mathrm{La}^{3+}, \mathrm{Eu}^{3+}$ and $\mathrm{Lu}^{3+}$ is $(\mathrm{Y}=39, \mathrm{La}=57, \mathrm{Eu}=63, \mathrm{Lu}=71)$

On treating $\mathrm{SO}_2$ with aqueous solution of $\mathrm{KMnO}_4$, the manganese ion reduces to

Assertion (A) Mo has the ground state electronic configuration $4 d^5 5 s^1$.

Reason (R) Mo has the highest exchange energy among the second row transition elements.

The correct option among the following is

Choose the correct statement.

$\mathrm{Fe}^{3+}$ ion is more stable than $\mathrm{Fe}^{2+}$ ion because

The elements with full $d^{10}$ electronic configuration in their " +2 " oxidation state are

Which of the following ions will exhibit colour in aqueous solution?