Answer the question on the basis of passage given below:
One of the notable features of the transition element is the great variety of oxidation states it may show in its compounds. The elements which give the greatest number of oxidation states occur in or near the middle of the series. Manganese, for example exhibits all the oxidation states from 2 to +7. The lesser number of oxidation states at the extreme ends is either due to losing or sharing of few electrons (Se, Ti) or too many d electrons of higher valence. Early in the first series scandium (II) is virtually unknown and titanium (IV) which is more stable than Ti (III) or Ti (II). On the other end, the only oxidation state of zinc is \(+ 2\).
Ambidentate ligand among the following is
A. NCS
B. \(C _2 O _4^{2-}\)
C. SCN
D. \(H _2 NCH _2 CH _2 NH _2\)
E. \(NO _2\)
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Match List - I with List - II.

List - I	List - II
(A) Zero order reaction	(I) \(s ^{-1}\)
(B) First order reaction	(II) \(mol ^{-2} L^2 s^{-1}\)
(C) Second order reaction	(III) \(mol L ^{-1} s^{-1}\)
(D) Third order reaction	(IV) \(mol ^{-1} Ls ^{-1}\)

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The isotope \({ }^{42} K\) has a half life of about 12 hours. What fraction of the initial concentration remains after 48 hours?

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 vix. 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.
Predict the type of hybridisation state in \(\left[ CoF _6\right]^{3-}\)

Match List-I and List-II

List-I	List-II
A. Tranquilizers	I. Ofloxacin
B. Antibiotics	II. Chlorodiazepoxide
C. Antacids	III. Seldane
D. Antihistamines	IV. Cimetidine

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Answer the question on basis of passage given below :
Lyophobic sols like those of metals (Au, Ag, etc) are unstable and are easily precipitated by addition of electrolytes. However, it is observed that the addition of certain lyophilic colloids like gums, soaps, gelatine, etc. to lyophobic colloids (like a metal sol) render lyophobic colloids difficult to coagulate by the addition of electrolytes. The process is known as 'protection' and the lyophilic colloids are termed as Protective colloids. It is believed that the protective action of the lyophilic colloids is due to the covering up of the particles of the lyophobic colloid by those of the lyophilic colloid.
Evidently, smaller the gold number of a protective colloid, the greater is its protective action. In which of the following sols, the colloidal particles will move towards the cathode during electrophoresis?

Which of the following reagents can bring about the given conversion?
3-Nitrobromobenzene to 3-Nitrobenzoic acid

If A is an invertible matrix of order 3 × 3 then the value of |adj(A)| is:

Colostrum secreted by mother is rich in:

The following statements are based on the osmotic pressure of solutions. The correct statements are
(A) Molar concentration is same for isotonic solutions
(B) Solutions which have same osmotic pressure at same temperature arecalled isotonic solutions
(C) No osmosis occurs when isotonic solutions are separated by semipermeable membrane
(D) A 1.9% Sodium Chloride solution has equivalent osmotic pressure to that of fluid inside blood cells
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Arrange the stages of HIV infection in humans sequentially.
(A) Introduction of viral DNA in the cell
(B) Production of multiple viruses
(C) Infection of human cell by virus
(D) Incorporation of viral DNA into host genome
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Match List-I with List-II

List - I	List - II
(A) Angle between \(\hat{i}-\hat{j}\) and \(\hat{i}+\hat{j}\)	(I) \(\pi\)
(B) Angle between \(\hat{i}-\hat{j}+\hat{k}\) and \(-\hat{i}+\hat{j}-\hat{k}\)	(II) \(\frac{3 \pi}{4}\)
(C) Angle between \(\hat{i}+\hat{j}\) and \(-\hat{i}\)	(III) \(\frac{\pi}{4}\)
(D) Angle between \(\hat{i}+\hat{k}\) and \(\hat{k}\)	(IV) \(\frac{\pi}{2}\)

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Identify the correct options with respect to the salient features of DNA.
(A) The two polynucleotide chains are coiled in a left-handed fashion
(B) Adenine forms three hydrogen bonds with thymine
(C) The distance between a base pair in a DNA helix is approximately 0.34 nm
(D) The plane of one base pair stacks over the other in double helix
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