D & f- BLOCK ELEMENTS practice · Medium

Which of the following is not oxidized by ${\mathrm{O}_3}$?

Addition of high proportions of manganese makes steel useful in making rails of rail roads because manganese ;

Chemical name of corrosive sublimate is:

Non-stoichiometric compounds are formed by:

$d$-block elements are arranged in ….of periodic table.

Which of the following are incorrect orders of property indicated against it?

A mixture of inorganic substances on treatment with ${H}_2 {SO}_4$ (dilute) gives out a gas which turns ${K}_2 {Cr}_2 {O}_7$ paper green and lead acetate paper black. The mixture contains

1 mole of $\mathrm{Fe}\left(\mathrm{NO}_2\right)_2$ is oxidised into $\mathrm{Fe}^{3+}$ and $\mathrm{NO}_3^{-}$ by $\mathrm{x}$ mole of $\mathrm{Cr}_2 \mathrm{O}_7^{2-}$ in acidic medium, $\mathrm{x}$ is

The process of nitriding used in the treatment of steel is:

KI and $\mathrm{CuS}{\mathrm{O}_4}$ solutions on mixing produce

The oxidation number of Mn in the product of alkaline oxidative fusion of $\mathrm{Mn}{\mathrm{O}_2}$ is

${\mathrm{K}_2}\mathrm{C}{\mathrm{r}_2}{\mathrm{O}_7}$ on strong heating gives:

Which of the following compounds is metallic and ferromagnetic?

In the following salts the lowest value of magnetic moment is observed in

In which of the following reactions, reaction of silver with the given acids lead to the formation of
compound & silver, along with liberation of gas ?

$\mathrm{V}_2 \mathrm{O}_5$ reacts with alkalies to give

Which of the following statements are correct?

(i) Chromium has the highest melting point among the series 1 metals.

(ii) Number of unpaired electrons is greater in Cr than other elements of series 1 .

(iii) In any row the melting point of transition metal increases as the atomic number increases.

Steel resistant to acid is:

The metal ion whose electronic configuration is
not affected by the nature of the ligand and which
gives a violet colour in non-luminous flame under
hot condition in borax bead test is

The highest magnetic moment is shown by the transition metal ion with the configuration

Statement I : Generally transition elements exhibit higher enthalpies of atomisation.

Statement II : $\mathrm{Cr}^{2+}$ is reducing while $\mathrm{Mn}^{3+}$ is oxidizing.

In the light of above statements, choose the correct option among the following.

Assertion(A) Mn-atom loses $n s$ electrons first during ionisation as compared to $(n-1) d$ electrons.

Reason(R) The effective nuclear charge experienced by $(n-1) d$ electrons is greater than that by $n s$ electrons.

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

Assertion: Out of $CrO_3 \,\&\, Al_2O_3, CrO_3$ having lower melting point than $Al_2O_3$.
Reason: Oxidation state of $Cr$ in $CrO_3$ is high

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

The pair that has similar atomic radii is

The incorrect statement(s) among (1)-(3) is (are)
1) W(VI) is more stable than Cr(VI).
2) In the presence of HCl, permanganate titrations provide satisfactory results.
3) Some lanthanoid oxides can be used as phosphors.

Which of the following is not a member of $3d$-transition series?

The correct statement are

The oxidation number of Mn in the product of alkaline oxidative fusion of $\mathrm{Mn}{\mathrm{O}_2}$ is