MCQ
The formula of the complex hydridotrimethoxyborate $(III)$ ion is :
- ✓$[BH(OCH_3)_3]^{2-}$
- B$[BH_2(OCH_3)_3]^{2-}$
- C$[BH(OCH_3)_3]^-$
- D$[BH(OCH_3)_3]^+$
✓
Answer
Correct option: A.
$[BH(OCH_3)_3]^{2-}$
a
$\mathrm{Mn}^{2+}=\mathrm{d}^{5}=\mathrm{t}_{2 \mathrm{g}}^{3} \mathrm{e}_{\mathrm{g}}^{2} \Rightarrow \mathrm{CFSE}=0$
$\mathrm{Mn}^{2+}=\mathrm{d}^{5}=\mathrm{t}_{2 \mathrm{g}}^{3} \mathrm{e}_{\mathrm{g}}^{2} \Rightarrow \mathrm{CFSE}=0$
$\mathrm{Co}^{+3}=\mathrm{d}^{6}=\mathrm{t}_{2 \mathrm{g}}^{6}$
$\mathrm{Fe}^{3+}=\mathrm{d}^{5}=\mathrm{t}_{2 \mathrm{g}}^{5}$
$\mathrm{Ni}^{2+}=\mathrm{d}^{8}=\mathrm{t}_{2 \mathrm{g}}^{6} \mathrm{e}_{g}^{2}$
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
$P_4 + NaOH + H_2O \to x + y$ the sum of total $P-H$ bonds in $x$ and $y$ ?
→Which product in not obtained by Sandmeyer reaction?
The vapour pressures of two volatile liquids $A$ and $B$ at $25^{\circ} C$ are $50\, Torr$ and $100\, Torr,$ respectively. If the liquid mixture contains $0.3$ mole fraction of $A$, then the mole fraction of liquid $B$ in the vapour phase is $\frac{x}{17}$. The value of $x$ is $...$
→A metal complex of coordination number six having three different types of ligands $a, b$ and $c$ of composition $Ma_2b_2c_2$ can exist in several geometrical isomeric forms; the total number of such isomers is
→Match $List-I$ with $List-II$
→| $List-I$ | $List-II$ |
| $(A)$Glucose $+ HI$ | $(I)$ Gluconic acid |
| $(B)$Glucose $+ Br _{2}$ water | $(II)$ Glucose pentacetate |
| $(C)$Glucose $+$ acetic anhydride | $(III)$ Saccharic acid |
| $(D)$Glucose $+ HNO _{3}$ | $(IV)$ Hexane |
Choose the correct answer from the options given below.
Order of decreasing basic strengths of halides is
The decreasing order of reactivity of the compounds given below towards solvolysis under identical conditions is
A mixture of benzene and toluene forms
Correct statement regarding above sequence of reaction.
The product obtained when acidic potassium permanganate solution is reacted with oxalate ion is :