AP EAMCET · Chemistry · Coordination Compounds

The oxidation state of $\mathrm{Co}$ in $\mathrm{K}\left[\mathrm{Co}(\mathrm{CO})_4\right]$ is

A 3
B –3
C 1
D –4

Verified Solution

Answer & Solution

Correct Answer

(D) –4

Step-by-step Solution

Detailed explanation

No solution. Refer to answer key.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Identify the correct statements from the following
(i) Electromeric effect is a permanent effect.
(ii) Hyper conjugation is a temporary effect.
(iii) Fractional distillation is used to separate two liquids from a mixture if the difference in their boiling points is less.
(iv) Different compounds are adsorbed on an adsorbent different extents.

AP EAMCET 2017 Easy
A metal oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by metal ions. The formula of metal oxide is

AP EAMCET 2018 Medium
Which among the following statements is/are incorrect regarding real gases?
(i) Their compressibility factor is never equal to unity $(Z \neq 1)$ .
(ii) The deviations from ideal behavior are less at low pressures and high temperatures.
(iii) Intermolecular forces among gas molecules are equal to zero.
(iv) The obey Van der Waals equation, $PV = nRT$ .

AP EAMCET 2021 Medium
What will be the molality of the solution containing $18.25 \mathrm{~g}$ of $\mathrm{HCl}$ gas in $500 \mathrm{~g}$ of water?

AP EAMCET 2020 Medium
A person living in Shimla observed that, cooking food without using pressure cooker takes more time. The reason is that at high altitude

AP EAMCET 2021 Easy
In Dumas method, $0.3 \mathrm{~g}$ of an organic compound gave $45 \mathrm{~mL}$ of nitrogen at STP. The percentage of nitrogen is

AP EAMCET 2016 Medium

Explore more questions on app

From AP EAMCET

If $f_n(x)=\frac{1}{2 n}\left[\sin ^{2 n} x+\cos ^{2 n} x\right]$, then $f_1(x)+f_2(x)-f_3$ (x) $=$

AP EAMCET 2023 Easy
If $\theta=\cot ^{-1}(7)+\cot ^{-1}(8)+\cot ^{-1}(18)$, then $\cot \theta$ is equal to

AP EAMCET 2020 Medium
At 300 K . the $E_{\text {cell }}^{\circ}$ of
$\mathrm{A}(\mathrm{~s})+\mathrm{B}^{2+}(\mathrm{aq}) \rightleftharpoons \mathrm{A}^{2+}(\mathrm{aq})+\mathrm{B}(\mathrm{~s})$
is 1.0 V . If $\Delta_r S^{\circ}$ of this reaction is $100 \mathrm{JK}^{-1}$, what is $\Delta_{\mathrm{r}} \mathrm{H}^{\circ}$
(in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) of this reaction?( $\mathrm{F}=96500 \mathrm{Cmol}^{-1}$ )

AP EAMCET 2024 Medium
The two positive numbers with sum ' $t$ ', and the sum of their squares is minimum are

AP EAMCET 2020 Easy
In $\triangle \mathrm{ABC}$, if $\mathrm{r}$ is the inradius and $\mathrm{r}_1, \mathrm{r}_2, \mathrm{r}_3$ are the ex-radii, then $\frac{1}{4}\left[b^2 \sin 2 C+c^2 \sin 2 B\right]=$

AP EAMCET 2023 Medium
Conjugate acid and conjugate base of $\mathrm{HCO}_3^{-}$are respectively

AP EAMCET 2023 Easy

Explore more questions on app

The oxidation state of \(\mathrm{Co}\) in \(\mathrm{K}\left[\mathrm{Co}(\mathrm{CO})_4\right]\) is

Answer & Solution

Step-by-step Solution

See the Complete Solution