D & f- BLOCK ELEMENTS practice · Mixed difficulty

The spin only magnetic moment [in units of Bohr magneton] of ${Ni}^{2+}$ in aqueous solution would be (At. No. 28) :

The compound used in preservation of wood is:

On strongly heating $\mathrm{AgN}{\mathrm{O}_3}$ we get:

Statement I: $\mathrm{Fe}^{+2}$ is more stable than $\mathrm{Fe}^{+3}$ ion

Statement II: $\mathrm{Fe}^{+3}$ ion contain half-filled $3 \mathrm{d}$ subshell

A solution of $10 \mathrm{~mL} \frac{{M}}{10} {FeSO}_4$ is titrated with ${KMnO}_4$ solution in acidic medium the amount of ${KMnO}_4$ used will be

Which of the following metal ions is not coloured?

Which of the following is an acidic oxide?

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

Magnetic moment in B.M. of $\mathrm{Ni}^{2+}$ ion is

The extraction of which of the following metals involves bessemerization?

Consider the following reaction:

$\mathrm{NaCl}+\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathbf{A}+\mathrm{K}_2 \mathrm{SO}_4+\mathrm{Na}_2 \mathrm{SO}_4+\mathrm{H}_2 \mathrm{O}$ The formula and colour of the product ' $A$ ' respectively will be

Each transition series contains:

Magnetic moment of manganese in ${\left( {\mathrm{N}{\mathrm{H}_4}} \right)_2}\mathrm{MnB}{\mathrm{r}_2}$ is

Magnetic moment of $C{r^{2 + }}$ ion is

Which of the following statements are INCORRECT?
A. All the transition metals except scandium form $\text{MO}$ oxides which are ionic.
B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in $\mathrm{Sc}_2 \mathrm{O}_3$ to $\mathrm{Mn}_2 \mathrm{O}_7$.
C. Basic character increases from $\mathrm{V}_2 \mathrm{O}_3$ to $\mathrm{V}_2 \mathrm{O}_4$ to $\mathrm{V}_2 \mathrm{O}_5$.
D. $\mathrm{V}_2 \mathrm{O}_4$ dissolves in acids to give $\mathrm{VO}_4^{3-}$ salts.
E. $\mathrm{CrO}$ is basic but $\mathrm{Cr}_2 \mathrm{O}_3$ is amphoteric.
Choose the correct answer from the options given below:

Essential constituent of an amalgam is:

A laboratory reagent imparts green colour to the flame. On heating with solid ${K}_2 {Cr}_2 {O}_7$ and conc. ${H}_2 {SO}_4$ it evolves a red gas. Identify the reagent

Which one of the following reactions will occur on heating $\mathrm{AgN}{\mathrm{O}_3}$ above its melting point?

Assertion : ${\text{U}}{{\text{F}}_6}$ is more covalent than ${\text{U}}{{\text{F}}_4}$.

Reason : Fluorine is smaller in size.

A magnetic moment of 1.73 BM will be shown by one among the following compounds:

When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of

Ruthenium carbonyl is:

$Zr\mathrm{ }(Z = 40)\mathrm{ and }Hf(Z = 72)$ have similar atomic and ionic radii because of:

Lanthanides are

Copper exhibits only +2 oxidation state in its stable compounds. Why?

Transition metal complex with highest value of crystal field splitting $({\Delta _0})$ will be

An aqueous solution of $\mathrm{FeS}{\mathrm{O}_4},\mathrm{A}{\mathrm{l}_2}{\left( {\mathrm{S}{\mathrm{O}_4}} \right)_3}$ and chrome alum is heated with excess of $\mathrm{N}{\mathrm{a}_2}{\mathrm{O}_2}$ and filtered. The materials obtained are:

The trivalent ion having largest size in lanthanide series is

Impurities of Cu and Ag from gold are removed by

Which form of iron is least ductile?