MCQ
Europium is
- A$s-$block element
- B$p-$block element
- C$d-$block element
- ✓$f-$block element
$Eu = [Xe]\,4{f^7}6{s^2}$
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This polymer $(B)$ is obtained when acetone is saturated with hydrogen chloride gas, $B$ can be
$(I)$ ${O_3} \to $ product
$(II)$ $C{r_2}O_7^{2 - }\xrightarrow{{{H^ + }}}$ product
$(III)$ $MnO_4^\Theta \xrightarrow{{{H^ + }}}$ product
$(IV)$ $H_2S \longrightarrow $ product
