D & f- BLOCK ELEMENTS practice · Mixed difficulty

What happens when a molten mixture of $\mathrm{K}_2 \mathrm{FeO}_4$ and $\mathrm{K}_2 \mathrm{CrO}_4$ is acidified?

Among $\mathrm{FeSO}_4 \cdot 7 \mathrm{H}_2 \mathrm{O}(A), \mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}(B)$, $\mathrm{ZnSO}_4 \cdot 7 \mathrm{H}_2 \mathrm{O}(C), \mathrm{MnSO}_4 \cdot 4 \mathrm{H}_2 \mathrm{O}(D)$ isomorphous salts are

Consider the following statements.

1. The transition metals and their compounds exhibit catalytic property.

II. Transition metals also show paramagnetic behaviour. The correct statement(s) is/are (choose the correct option)

The highest oxidation state exhibited by transition metals is

When $KI$ and $CuS{O_4}$ solutions are mixed , it gives

Europium (Eu) and Terbium (Tb) attain state $4 f^7$ configuration by exhibiting oxidation states of

Which of the following element is not a member of transition elements?

The electronic configuration of $\mathrm{Cu}(\mathrm{II})$ is $3 d^9$ while that of $\mathrm{Cu}(\mathrm{I})$ is $3 d^{10}$. Identify the correct statement.

Which statement about Hg is correct?

${V}_2 {O}_4$ when dissolve in acids gives

The product A in the following equation, $2KMn{O_4} \to A + Mn{O_2} + {O_2}$ is:

The alloy of steel that is used for making automobile parts and utensils is:

Most of the transition metals are paramagnetic due to the presence of:

Assertion : 1st ionisation potential of mercury is greater than cadmium

Reason : Hg has stable electronic configuration $(5{d^{10}}6{s^2})$

When ${KMnO}_4$ acts as an oxidizing agent and ultimately forms ${MnO}_4^{2-}, {MnO}_2, {Mn}_2 {O}_3$ and ${Mn}^{2+}$ then the number of electrons transferred in each case respectively are

The number of incomplete orbitals in inner transition elements is:

$5f$-level is successively filled up in:

Manganese steel contains:

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

Which one of the following indicates the correct order of atomic size?

Which of the following statement are correct about ${Zn}, {Cd}$ and ${Hg}$?

A. They exhibit high enthalpy of atomization as the $d$-subshell is full.

B. ${Zn}$ and ${Cd}$ do not show variable oxidation state while ${Hg}$ shows +I and +II.

C. Compounds of ${Zn}, {Cd}$ and ${Hg}$ are paramagnetic in nature.

D. ${Zn}, {Cd}$ and ${Hg}$ are called soft metals.

Choose the most appropriate from the options given below:

Which of the following is correct?

Molten Ag absorbs about ……… times of ${\mathrm{O}_2}$:

Copper becomes green when exposed to moist air for a long period. This is due to

In context with the transition elements, which of the following statements is incorrect?

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : In aqueous solutions $\mathrm{Cr}^{2+}$ is reducing while $\mathrm{Mn}^{3+}$ is oxidising in nature.

Reason (R) : Extra stability to half filled electronic configuration is observed than incompletely filled electronic configuration.

In the light of the above statement, choose the most appropriate answer from the options given below:

Assertion (A) : Chromium can be used as a protective and non-corrosive plating on other metals.

Reason (R): Due to atmospheric oxidation, chemically a inert layer of $\mathrm{Cr}_2 \mathrm{O}_3$ is formed.

Which of the following is philosopher’s wool?

Which of the following does not react with oxygen directly?

Assertion: Higher oxidation states in transition metals are more covalent than lower oxidation states.

Reason: Higher oxidation states involve more d-electrons than lower oxidation states.