Arrange the following complexes in decreasing order of absorption of wavelength of light in the visible region:
(A) \(\left[ Co ( CN )_6\right]^{3-}\)
(B) \(\left[ CoF _6\right]^{3-}\)
(C) \(\left[ Co \left( H _2 O \right)_6\right]^{3+}\)
(D) \(\left[ Co \left( NH _3\right)_6\right]^{3+}\)
Choose the correct option from below:

Werner was the first to describe the bonding features in coordination compounds. But his theory could not answer basic questions like :
(i) Why only certain elements possess the remarkable property of forming coordination compounds ?
(ii) Why the bonds in coordination compounds have directional properties?
(iii) Why coordination compounds have characteristics magnetic and optical properties ?
Many approaches have been put forth to explain the nature of bonding in coordination compounds viz. Valence Bond Theory (VBT), Crystal Field Theory (CFT), Ligand Field Theory (LFT) and Molecular Orbital Theory (MOT).
We shall focus our attention on elementary treatment of the application of VBT and CFT to coordination compounds.
According to this theory, the metal atom or ion under the influence of ligands can use its ( \(n -1) d , ns np\) or ns, np, nd orbitals for hybridisation
to yield a set of equivalent orbitals of definite geometry such as octahedral, tetrahedral, square planar and so on.
These hybridised orbitals are allowed to overlap with ligand orbitals that can donate electron pairs for bonding.
\(CoCl _3 \cdot 6 NH _3\) gives 3 moles of AgCl on reacting with \(AgNO _3\).
The correct formula for this compound is :

Read the passage carefully and answer the Questions
The term vitamin was coined from the word vital +amine since the earlier identified compounds had amino groups. Later work showed that most of them didn't contain amino groups, so the letter "e" was dropped and ther term vitamin is used these days.
Vitamins are classified into two groups depending upon their solubility in water or fat. Fat soluble vitamins are soluble in fat and oils but insoluble in water. They are stored in liver and adipose (fat storing) tissues. Water-soluble vitamins are soluble in water. They must be supplied regularly in the diet as they are readily excreated in urine.
What are the sources of Vitamin B12?

According to Alexander Zaitsev the most preferred product for dehydrohalogenation of 2-Bromopentane will be :

Equilibrium constant is \(2 \times 10^{37}\) at 298 K for the reaction:
\(Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)\).
Predict the spontaneity of the cell and calculate \(E_{\text{cell}}\).
[Given: \(\text{log } 2 = 0.3010\)]

Select the correct relation of half life for a zero order reaction.

Relation between equilibrium constant and standard potential of the cell under standard conditions is represented by :

Which of the following statements are NOT true for biopiracy?
(A) It is the use of bio-resources by multinational companies with proper authorisation by the concerned country
(B) Developing countries are rich in biodiversity
C) Developed countries are rich in traditional knowledge related to bio resources
(D) Biopiracy involves inadequate compensation and benefit sharing between developed and developing countries, while using latter's bioresources by the former
Choose the correct answer from the options given below:

If the relation \(R: A \rightarrow B\), where \(A=\{2,3,4\}\) and \(B=\{3,4,5\}\) is defined by \(R=\{(x, y): x < y, x \in A, y \in B\}\), then

Two sources of light are said to be coherent when they emit light of
A. same wavelength
B. same amplitude
C. same intensity
D. constant phase difference
Choose the correct answer from the options given below:

If \(y=3 e^{2 x}+2 e^{3 x}\), then \(\frac{d^2 y}{d x^2}+6 y\) is equal to:

Let \(A\) be a non-singular matrix of order 3 and \(|A|=15\), then \(|\operatorname{adj} A|\) is equal to:

Genetically modified organisms have been useful in many ways. Which one
of the following statements is not correct in the case of GMO plants?