d and f Block Elements

Which of the following lanthanoid is diamagnetic? Atomic no's$\mathrm{Sm}=62,\mathrm{Ce}=58,\mathrm{Eu}=63,\mathrm{Yb}=70$

In acidic medium, $H_{2}O_{2}$ changes $Cr_{2}O_{7}^{-2}$ to $CrO_{5}$ which has two $\left(-O-O-\right)$ bonds Oxidation state of $Cr$ in $CrO_{5}$ is:

Given below are two statements : Statement I : Ferromagnetism is considered as an extreme form of paramagnetism. Statement II : The number of unpaired electrons in a $\mathrm{Cr}^{2+}$ ion $(\mathrm{Z}=24)$ is the same…

The number of water molecules not coordinated to copper ion directly in $CuSO_{4}\cdot\,5H_{2}O,$ is

Number of colourless lanthanoid ions among the following is ________ $\(\mathrm{Eu}^{3+},$ $\mathrm{Lu}^{3+},$ $\mathrm{Nd}^{3+},$ $\mathrm{La}^{3+},$ $\mathrm{Sm}^{3+}\)$

The spin only magnetic moment ($\mu$) value (B.M.) of the compound with strongest oxidising power among $\mathrm{Mn}_2 \mathrm{O}_3, \mathrm{TiO}$ and VO is ____ B.M. (Nearest integer)?

Niobium (Nb) and ruthenium $(\mathrm{Ru})$ have " $x$ " and " $y$ " number of electrons in their respective 4 d orbitals. The value of $x+y$ is ______ -.

Total number of species from the following with central atom utilising $\(\mathrm{sp}^2\)$ hybrid orbitals for bonding is _____. $\(\mathrm{NH}_3,$ $\mathrm{SO}_2,$ $\mathrm{SiO}_2,$ $\mathrm{BeCl}_2,$ $\mathrm{C}_2$…

In the titration of $\mathrm{KMnO}_{4}$ and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is

The correct order of following $3d$ metal oxides, according to their oxidation numbers is : (a) $\mathrm{CrO}_{3}$ (b) $\mathrm{Fe}_{2}O_{3}$ (c) $\mathrm{MnO}_{2}$ (d) $V_{2}O_{5}$ (e) $\mathrm{Cu}_{2}O$

A solution of $\mathrm{FeCl}_{3}$when treated with $K_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$ gives a prussian blue precipitate due to the formation of

Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the mangenese product formed from the above reaction is B.M.___(Nearest Integer)