d and f Block Elements

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…

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:

Which one of the following statements is correct when $SO_{2}$ is passed through acidified $K_{2}Cr_{2}O_{7}$ solution?

Spin only magnetic moment $2\operatorname{.84}\,\mathrm{BM}$ is given by: (Atomic Number of…

Name the gas that can readily decolourise acidified $\mathrm{KMnO}_{4}$ solution.

Match the following aspects with the respective metal. Aspects Metal (a) The metalwhich revealsa maximumnumber ofoxidation states (p) Scandium (b) The metal although placed in $3d$block isconsidered notas a…

Which of the following statements are INCORRECT? A. All the transition metals except scandium form $\mathrm{MO}$oxides which are ionic. B. The highest oxidation number corresponding to the group number in transition…

Which of the following oxide is amphoteric innature?

The reaction of aqueous $KMnO_{4}$ with $H_{2}O_{2}$ in acidic conditions gives:

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 \mathrm{H}_2,…

In Carius method for estimation of halogens, $0.2g$ of an organic compound gave $0.188g$ of $\mathrm{AgBr}.$The percentage of bromine in the compound is __________. (Nearest integer) [Atomic mass:…

Which of the following oxide is amphoteric innature?