MCQ
Which ine of the following statement about lanthanides is false?
  • A
    Lanthanides are sepearated from one another by ion exchange method.
  • The ionic radii of trivalent lanthanides steadily increases with increase in atomic number.
  • C
    All lanthanides are highly dense metals.
  • D
    Most typical oxidation state of lanthanides is $+3$

Answer

Correct option: B.
The ionic radii of trivalent lanthanides steadily increases with increase in atomic number.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Which is the best method for preparation of the $N$ -methyl ethanamide?
The order of a reaction is said to be $ 2 $ with respect to a reactant $X, $ when
Match the compounds in $LIST-I$ with the observation in $LIST-II$, and choose the correct option.

$LIST-I$ $LIST-II$
$(I)$ Aniline $(P)$ Sodium fusion extract of the compound on boiling with $FeSO _4$, followed by acidification with conc. $H _2 SO _4$, gives Prussian blue color.
$(II)$ o-Cresol $(Q)$ Sodium fusion extract of the compound on treatment with sodium nitroprusside gives blood red color.
$(III)$ Cysteine $(R)$ Addition of the compound to a saturated solution of $NaHCO _3$ results in effervescence.
$(IV)$ Coprolactam $(S)$ The compound reacts with bromine water to give a white precipitate.
  $(T)$ Treating the compound with neutral $FeCl _3$ solution produces violet color.

 

During extraction of metals, electrolytic refining is used to obtain pure metals. What is the electrolyte used?
Correct increasing order for the wavelength of absorption in the visible region for the complexes of $CO ^{3+}$ is :
Which of the following complex ions is not diamagnetic?
Correct statement about the given chemical reaction is :
Compound $P$ is neutral. $Q$ gives effervescence with $NaHCO _3$ while $R$ reacts with Hinsbergs reagent to give solid soluble in $NaOH$. Compound $P$ is
Which of the following is the sweetest sugar
A solution of a salt of a metal was electrolysed for $150$ minutes with a current of $0.15$ amperes. The weight of metal deposited was $0.783\,gm$. The equivalent weight of the metal is ................... $\mathrm{gm}$