MCQ
The aqueous solution containing which one of the following ions will be colourless
- ✓$S{c^{3 + }}$
- B$F{e^{2 + }}$
- C$T{i^{3 + }}$
- D$M{n^{2 + }}$ (Atomic number $Sc = 21,\, Fe = 26, \,Ti = 22, \,Mn = 25)$
✓
Answer
Correct option: A.
$S{c^{3 + }}$
a
(a)$_{21}Sc \to 1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}4{s^2}3{d^1}$
(a)$_{21}Sc \to 1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}4{s^2}3{d^1}$
$S{c^{ + 3}} \to 1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}$
Due to presence of paired electron it will be colourless.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
For the following two acid-base reactions, which statement is True ?
→$(I){\mkern 1mu} C{H_3}CH_2^ - {\mkern 1mu} + {\mkern 1mu} \mathop {C{H_3}N{H_2}}\limits_{p{K_a} = 35} \rightleftharpoons \mathop {C{H_3}C{H_3}}\limits_{p{K_a} = 50} + C{H_3}N{H^ - }$
$(II){\mkern 1mu} {F^ - }{\mkern 1mu} + {\mkern 1mu} \mathop {{H_2}O}\limits_{p{K_a} = 15.7} \rightleftharpoons \mathop {HF}\limits_{p{K_a} = 3.2} + H{O^ - }$
Product $A$ is
→$C{H_3}COOH\xrightarrow[\Delta ]{{N{H_3}}}X\xrightarrow{{NaOBr}}Y\xrightarrow{{NaN{O_2} + HCl}}Z$
→What is $Z$ ?
What is the correct sequence of reagents used for converting nitrobenzene into $m$ -dibromobenzene?
→Sulphuric acid reacts with $PCl_5$ to give
→For the reaction $CO(g) + \frac{1}{2}{O_2}(g)$$\rightleftharpoons$ $C{O_2}(g)$; $\frac{{{K_p}}}{{{K_c}}}$ is equivalent to
→Which is incorrectly matched ?
Main Products formed during a reaction of $1-$methoxy naphthalene with hydroiodic acid are :
→Incorrect statement is
Identify structure of $B$
→