Select the Lanthanoids which show +2 oxidation state?
(A) Yb
(B) Ce
(C). Eu
(D) Ho
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\(C_6H_5NO_2 \xrightarrow{(1) Fe/HCl \ (2) HNO_2 \ (3) H_2O}\) A Product 'A' is:

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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. Ligands are treated as point charges in case of anions or dipoles in case of neutral molecules. 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 (either anions or the negative ends of dipolar molecules like NH3 and H2O) 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 of the following pairs exists as high-spin, tetrahedral complexes?

The quantity of electricity produced in the oxidation of 67.2 L of \(H 2\) at STP is:

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There are mainly four series of the transition metals, \(3 d\) series ( \(S c\) to Zn), \(4 d\) series (Y to Cd), \(5 d\) series ( La and Hf to Hg ) and 6d series which has \(A c\) and elements from \(R f\) to \(C n\). The two series of the inner transition metals; \(4 f\) (Ce to Lu) and \(5 f\) (Th to Lr) are known as lanthanoids and actinoids respectively. Their chemical properties are transitional between those of \(s\) and \(p\)-block elements. The transition metals (with the exception of Zn, Cd and Hg) are very hard and have low volatility. Their melting and boiling points are high. Transition metals have incomplete d subshell either in neutral atom or in their ions. With partly filled d orbitals these elements exhibit certain characteristic properties such as display of a variety of oxidation states, formation of coloured ions and entering into complex formation with a variety of ligands. The transition metals and their compounds are known for their catalytic activity.
The highest oxidation states shown by V , Fe and Ni respectively are __________ .

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Optically active polyhydroxy aldehydes or ketones or molecules which provide such units on hydrolysis are called carbohydrates. They can be broadly classified as monosaccharides, disaccharides and polysaccharides depending on their behavior towards hydrolysis. They are also classified as reducing or non-reducing sugars. Another class of biomolecules is proteins which are polymers of twenty different amino acids linked by peptide bonds. Amino acids can be classified as acidic, basic or neutral depending on the relative number of amino and carboxyl groups in their
molecule. The essential amino acids cannot be synthesized by our body and hence must be provided through diet. Nucleic acids are the polymers of nucleotides which in turn consist of a base, pentose sugar and phosphate. There are two types of nucleic acids namely, DNA and RNA which differ in the composition of sugar and a base
The sugar moiety in DNA and RNA molecules, respectively, are

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The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed as adsorption. There are two types of adsorption. In physisorption, attractive forces are mainly Van der Waals while in chemical adsorption adsorbate is held with chemical bonds adsorbent. Adsorption increases with increase in pressure and decreases as temperature is increased.
Which of the following is not application of adsorption?

Which of the following statements are correct with respect to T.H. Morgan?
(A) His experiment led to discovering the basis for the variation that sexual reproduction produced.
(B) He mapped the position of genes on the chromosomes.
(C) He coined the term linkage.
(D) He crossed yellow-bodied, white-eyed Drosophila females to brown-bodied red-eyed Drosophila males and observed the results contrary to that of Mendel's.
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Match List - I with List - II.

List - I	List - II
(A) Orbital radius of electron	(I) \( \propto \frac{1}{n} \)
(B) Orbital velocity of electron	(II) \( \propto n \)
(C) Orbital frequency of electron	(III) \( \propto \frac{1}{n^3} \)
(D) Angular momentum of electron List	(IV) \( \propto n^2 \)

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When a mixture of NaCl and \(K _2 Cr _2 O _7\) is gently warmed with conc. \(H _2 SO _4\) ?
(A) Deep red vapours are evolved.
(B) The Vapours when passed through NaOH solution give yellow solution of \(Na _2 CrO _4\).
(C) Chlorine gas is evolved.
(D) Chromyl chloride is formed.
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Which of the following in NOT true for sickle cell anemia?
A. It is caused by substitution of glutamic acid by valine.
B. It is caused by substitution of valine by glutamic acid.
C. Mutant haemoglobin molecule causes change in shape of RBCs from biconcave to biconvex.
D. Individual heterozygous for sickle cell anaemia can transmit the mutant gene to the offsprings.
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When the light of frequency \(2 \nu_0\) (where \(\nu_0\) is the threshold frequency) is incident on a photosensitive material, the maximum velocity of electrons emitted is \(v_1\). When the frequency of the incident radiation is increased to \(3 \nu_0\), the maximum velocity of emitted electrons from the same material is \(v_2\). The ratio of \(v_1\) to \(v_2\) will then be :

For any square matrix \(A ;\left(A-A^{\prime}\right)\) is :