D & f- BLOCK ELEMENTS practice · Mixed difficulty

For the ions ${Zn}^{2+}, {Ni}^{2+}$ and ${Cr}^{3+}$ which among the following statements is correct?

(atomic number of ${Zn}=30, {Ni}=28$ and ${Cr}=24$ )

Percentage of gold in 21.6 carat gold is:

Assertion: $\mathrm{Fe}_3 \mathrm{O}_4$ contains iron atoms in two different oxidation numbers.

Reason: $\mathrm{Fe}^{2+}$ ions decolourize $\mathrm{KMnO}_4$ solution.

Assertion : ${\text{KMn}}{{\text{O}}_{\text{4}}}$ is dark pink coloured compound.

Reason : In the ${\text{KMn}}{{\text{O}}_{\text{4}}}$ charge transfer spectrum occurs.

Zinc white is a better white pigment than lead white because it:

Which shows a jump in second ionization potential?

Useful lanthanoid member is:

Which of the following is amphoteric oxide?

$\mathrm{Mn}_2 \mathrm{O}_7, \mathrm{CrO}_3, \mathrm{Cr}_2 \mathrm{O}_3, \mathrm{CrO}, \mathrm{V}_2 \mathrm{O}_5 \text { and } \mathrm{V}_2 \mathrm{O}_4$

Which one of the following statements concerning lanthanide elements is false?

Electronic configuration of a transition element x in +3 oxidation state is $\left[ {Ar} \right]3{d^5}$. It’s atomic number is

Which of the following is the correct sequence of atomic weights of given elements?

Which of the following is a lanthanoid?

Which ion in aqueous medium has orange colour?

Assertion (A): The degree of complex formation in actinoides decreases in the order

${M}_4^{+}>{MO}_2^{2+}>{M}^{3+}>{MO}_2^{+}$

Reason (R): Actinoides form complexes with $\pi$-bonding ligands such as alkyl phosphines and thioethers.

When $\mathrm{KI}$ (excess) is added to the following solutions

(i) $\mathrm{CuSO}_4$

(ii) $\mathrm{HgCl}_2$

(iii) $\mathrm{Pb}\left(\mathrm{NO}_3\right)_2$

separately:

The reaction below can be used as a laboratory method for preparing small quantities of $\mathrm{Cl}_2(\mathrm{~g})$. If a $49 \mathrm{~g}$ sample that is $96 \% \mathrm{~K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ by mass is allowed to react with $325 \mathrm{~mL}$ of $\mathrm{HCl}_{(\mathrm{aq})}$ with a density of $1.15 \mathrm{~g} / \mathrm{ml}$ and $30.1 \% \mathrm{HCl}$ by mass, how many grams of $\mathrm{Cl}_2(\mathrm{~g})$ are produced?

$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+\mathrm{HCl} \rightarrow \mathrm{CrCl}_3+\mathrm{Cl}_2+\mathrm{H}_2 \mathrm{O}+\mathrm{KCl}$

(Atomic weights: $\mathrm{K}=39, \mathrm{Cr}=52, \mathrm{Cl}=35.5$ )

Lightest transition element is:

Choose the appropriate option about the misch metal.

Which is less reactive?

Consider the following statements.

(I)$\mathrm{La}{\left( {\mathrm{OH}} \right)_3}$ is the least basic among hydroxides of lanthanides

(II) $\mathrm{Z}{\mathrm{r}^{4 + }}$ and $\mathrm{H}{\mathrm{f}^{4 + }}$ possess almost the same ionic radii

(III) $\mathrm{C}{\mathrm{e}^{4 + }}$ can act as an oxidizing agent

Which of the above is/are true?

Assertion : Actinides show much higher range of oxidation states

Reason : Energy difference between 5f and 6d orbitals is large

Statement (I): 2nd and 3rd transition series exhibit similar radii.

Statement (II): It is the net result of lanthanoid contraction.

The magnetic moment of a transition metal ion is $\sqrt {15\;}$BM. Therefore, the number of unpaired electrons present in it, is

A solid (A) which has photographic effect reacts with the solution of a sodium salt (B) to give a pale yellow ppt. (C). Sodium salt on heating gives brown vapours.

Identify A, B and C .

Aqueous solution of which ion is pink in colour

Consider the following statements

I. $Sc$ has a low value of $E_{{M^{ + 3}}/{M^{ + 2}}}^0$

II. $Zn$ has the highest value of $E_{{M^{ + 3}}/{M^{ + 2}}}^0$

III. $Mn$ and $Fe$ have comparatively high and low values of $E_{{M^{ + 3}}/{M^{ + 2}}}^0$ respectively

The correct set of statements is (Choose the low values of $E_{{M^{ + 3}}/{M^{ + 2}}}^0$ respectively).

The correct set of statements is (Choose the appropriate option)

Verdigris is

Which of the following compound has colour due to $d-d$ transition?

The magnetic moment of lanthanide ions is determined from which one of the following relation?

Which of the following electronic configurations belong to transition elements?