Identify the optically active compounds from the following:
(A) \([\text{Co(en)}_3\text{]}^{3+}\)
(B) \(\text{trans-[Co(en)}_2\text{Cl}_2\text{]}^{+}\)
(C) \(\text{cis-[Co(en)}_2\text{Cl}_2\text{]}^{+}\)
(D) \([\text{Cr(NH}_3\text{)}_5\text{Cl}]\)
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Identify the essential amino acids from the following.
(A) Threonine
(B) Serine
(C) Histidine
(D) Lysine
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What is the product of the following reaction?
\(R - CH _2- COOH \xrightarrow[(i i) H _2 O ]{( i ) X _2 / \text { Red phosphorus }( X = Cl , Br )}\) ?

A square planar complex is formed by hybridisation :

The unit of conductance is:

Read the passage carefully and answer the Questions
According to Valence Bond 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. While the VB theory, to a larger extent, explains the formation, structures and magnetic behaviour of coordination compounds, it suffers from the many shortcomings. The Crystal field theory (CFT) is an electrostatic model which considers the metal-ligand bond to be ionic arising purely from electrostatic interactions between the metal ion and the ligand. The five \(d\) orbitals in an isolated gaseous metal atom/ion have same energy, i.e., they are degenerate. This degeneracy is maintained if a spherically symmetrical field of negative charges surrounds the metal atom/ion. However, when this negative field is due to ligands in a complex, it becomes asymmetrical and the degeneracy of the \(d\) orbitals is lifted. It results in splitting of the \(d\) orbitals. The pattern of splitting depends upon the nature of the crystal field.
Which among the following are diamagnetic complexes?
\(\left[Ni(CN)_4\right]^{2-},\left[Co\left(C_2O_4\right)_3\right]^{3-},\left[Fe(CN)_6\right]^{4-},\left[CoF_6\right]^{3-},\left[Mn(CN)_6\right]^{3-}\)

Which of following reagents will furnish ambident nucleophile?
(A) AgCN
(B) KCN
(C) AgNO2
(D) KNO2
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A double stranded DNA fragment has 500 Adenine bases. If total number of base pairs in this fragment is 2500, then what will be the number of guanine bases?

The amount of urea required to make a 500 mL solution of \(20 \%( w / w )\) concentration is

Match the complexes given in List-I with oxidation state and the type of complexes given in List-II

List-I  (Complex)	List-II  (Oxidation state and type of complex)
(A) \(\left[ Co \left( NH _3\right)_6\right]^{3+}\)	(I) +2 and Inner orbital complex
(B) \(\left[ CoF _6\right]^{3-}\)	(II)  +2 and Outer orbital complex
(C) \(\left[ NiCl _4\right]^{2-}\)	(III) +3 and Outer orbital complex
(D) \(\left[ Ni ( CN )_4\right]^{2-}\)	(IV) +3 and Inner orbital complex

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The device that regulates change in intensity of illumination into change in electric current is :

The value of \(\lambda\) for which the two vectors \((2 \hat{i}-\hat{j}+2 \hat{k})\) and \((3 \hat{i}+\lambda \hat{j}+\hat{k})\) are perpendicular, is :

To form n-type semiconductor from a pure semiconductor, the impurity to be added is