D & f- BLOCK ELEMENTS practice · Mixed difficulty

Most basic compound among the following is

In chromyl chloride test for confirmation of ${Cl}^{-}$ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and $10 \% {H}_2 {O}_2$ turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is

The +3 ion of which one of the following has half-filled $4f$ sunshell?

Most common oxidation state of vanadium is

Which of the following compounds has colour but no unpaired electrons?

The magnetic moment $\mathrm{\mu }$, of transition metals is related to the number of unpaired elelctrnos $n$ as

Which will reduce acidified potassium dichromate solution?

Ferrous ion changes to $X$ ion, on reacting with acidified hydrogen peroxide. The number of $d$-electrons present in $X$ and its magnetic moment (in BM) are, respectively

Brass is an alloy of:

$\begin{aligned} & \mathrm{I}_{(\mathrm{a q})}^{\Theta}+\mathrm{MnO}_4^{-}(\mathrm{a q}) \xrightarrow{\mathrm{H}^{+}} \mathrm{x}+\mathrm{Mn}_{(\mathrm{a q})}^{+2} \\ & \mathrm{I}_{(\mathrm{a q})}^{\Theta}+\mathrm{MnO}_4^{-}(\mathrm{a q}) \xrightarrow[\text { weakly } \mathrm{OH}^{\Theta}]{\text { neutral }(\text { or })} \mathrm{y}+\mathrm{MnO}_2 \\ & \mathrm{MnO}_{4(\mathrm{a q})}^{-}+\mathrm{Mn}_{(\mathrm{a q})}^{+2} \xrightarrow{\mathrm{ZnSO}_4} \mathrm{z}+4 \mathrm{H}^{+} \end{aligned}$
products $\mathrm{x}, \mathrm{y}$ and $\mathrm{z}$ are respectively

Identify the incorrect statement among the following

Which of the following in its oxidation state shows the paramagnetism?

The correct order of spin only magnetic moments for the following complex ions is

$KMn{O_4}$ reacts with oxalic acid according to the equation $2MnO_4^ - + 5{C_2}O_4^{2 - } + 16{H^ + } \to 2M{n^{2 + }} + 10C{O_2} + 8{H_2}O$
Here 20 ml of 0.1 M $KMn{O_4}$ will react with

${\left( {\mathrm{N}{\mathrm{H}_4}} \right)_2}\mathrm{C}{\mathrm{r}_2}{\mathrm{O}_7}$ on heating gives a gas which is also given by

${Na}_2 {O}_2$

Which of the following ions has the highest magnetic moment?

Which of the following electronic configuration represents the maximum magnetic moment?

Arrange $\mathrm{C}{\mathrm{e}^{3 + }},\mathrm{\;L}{\mathrm{a}^{3 + }},\mathrm{\;P}{\mathrm{m}^{3 + }}$ and $\mathrm{Y}{\mathrm{b}^{3 + }}$ in increasing order of their ionic radii

Assertion : ${\text{FeC}}{{\text{l}}_3}$ does not affect iodometric titration of ${\text{CuS}}{{\text{O}}_{\text{4}}}$ Solution

Reason : ${\text{FeC}}{{\text{l}}_3}$ is formed.

Correct outer electronic configuration of trivalent cationic form of ${Np}$ (Neptunium, atomic number of 93 ) is

In which of the following cases, the stability of two oxidation states is correctly represented

The nitrate of which metal leaves metallic globule on heating strongly?

Which of the following is most stable?

When excess of $\mathrm{SnC}{\mathrm{l}_2}$ is added to a solution of $\mathrm{HgC}{\mathrm{l}_2}$, a white ppt. turning to grey is obtained. This grey colour is due to the formation of:

A hard and resistant alloy generally used in tip of nib of pen is:

Pick out the correct statements from the following.

I. Cobalt (III) is more stable in octahedral complexes.

II. Zinc forms coloured ions or complexes.

III. Most of the $d$-block elements and their compounds are ferromagnetic.

IV. Osmium shows (VIII) oxidation state.

V. Cobalt (II) is more stable in octahedral complexes.

$4{\mathrm{K}_2}\mathrm{C}{\mathrm{r}_2}{\mathrm{O}_7}\xrightarrow{{\mathrm{Heat}}}4{\mathrm{K}_2}\mathrm{Cr}{\mathrm{O}_4} + 3{\mathrm{O}_2} + X$ In the above reaction, $X$ is

The set of correct statements is:

(i) Manganese exhibits +7 oxidation state in its oxide.

(ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides.

(iii) Sc shows +4 oxidation state which is oxidizing in nature.

(iv) Cr shows oxidising nature in +6 oxidation state.

Transition elements exhibit positive oxidation states only. This is because of: