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STD 12 - 4. d and f- block elements — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 4. d and f- block elements4 Marks
MCQ
Which of the following statement is $INCORRECT$ ?
  • ✓
    $Lu(OH)_3$ is more basic compared to $La(OH)_3$ .
  • B
    Lanthanide carbide ( $LnC_2$ ) produces acetylene on hydrolysis
  • C
    $CeS$ is used to make Crucible
  • D
    Misch-metal is used for making Cigarette lighter
✓

Answer

Correct option: A.
$Lu(OH)_3$ is more basic compared to $La(OH)_3$ .
a
$(A)$ In $f-$ block on moving from left to right due to lanthanide contraction size decreases, hence $E.N.$ increases so acidic nature of hydroxides increases.

$(B)$ $C_2^{2 - }$ on hydrolysis gives $C_2H_2$

$(C)$ and $(D)$ $f-$ block elements uses

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