The pair(s) of co-ordination complexes/ions exhibiting the same kind of isomerism is/are :
(A) \(\left[ Cr \left( NH _3\right)_5 Cl \right] Cl _2\) and \(\left[ Cr \left( NH _3\right)_4 Cl _2\right] Cl\)
(B) \(\left[ Co \left( NH _3\right)_4 Cl _2\right]^{+}\)and \(\left[ Pt \left( NH _3\right)_2\left( H _2 O \right) Cl \right]^{+}\)
(C) \(\left[ CoBr _2 Cl _2\right]^{2-}\) and \(\left[ PtBr _2 Cl _2\right]^{2-}\)
(D) \(\left[ Pt \left( NH _3\right)_3\left( NO _3\right)\right] Cl\) and \(\left[ Pt \left( NH _3\right)_3 Cl \right] Br\)
Choose the correct answer from the options given below :

Which of the following elements does not show allotropy?

Match the properties given in List-l with the metals given in List-ll

List-l Name of vitamins	List-II Deficiency disease
(A) Vitamin C	(I) Night blindness
(B) Vitamin K	(II) Rickets
(C) Vitamin D	(III) Increased blood clotting time
(D) Vitamin A	(IV) Scurvy

Choose the correct answer from the options given below:

Read the passage carefully and answer the following questions
There are mainly four series of the transition metals, 3d series (Sc to Zn), 4d series (Y to Cd), 5d series (La and Hf to Hg) and 6d series which has Ac and elements from Rf to Cn. The two series of the inner transition metals; 4f (Ce to Lu) and 5f (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.
Which of the following statements is correct?

Formaldehyde undergoes the Cannizzaro reaction because:
(A) It has alpha-hydrogen atom.
(B) It does not have alpha-hydrogen atom.
(C) It does not undergo self-oxidation and reduction on heating with concentrated alkali.
(D) It undergoes self-oxidation and reduction on heating with concentrated alkali.
Choose the correct answer from the options given below :

If you place blood cells in a solution containing more than 0.9% (mass/volume) sodium chloride, water will flow out of the cells and they will shrink. Such a solution is called

When a catalyst is used in a reaction, the heat absorbed or evolved during the reaction

Read the following paragraph and answer the given questions:
In order to link the alien DNA, the vector needs to have very few, preferably single, recognition sites for the commonly used restriction enzymes. Presence of more than one recognition site in the vector will generate several fragments, which will complicate the gene cloning. In order to link the alien DNA, the vector needs to have very few, preferably single, recognition sites for the commonly used restriction enzymes. Presence of more than one recognition sites within the vector will generate several fragments, which will complicate the gene cloning. The ligation of alien DNA is carried out at a restriction site present in one of the two antibiotic resistance genes. The recombinant plasmids will lose tetracycline resistance due to insertion of foreign DNA but can still be selected out from non-recombinant ones by plating the transformants on tetracycline containing medium.
The recombinants will grow in ampicillin containing medium but not on that containing tetracycline. But, non- recombinants will grow on the medium containing both the antibiotics. In this case, one antibiotic resistance gene helps in selecting the transformants, whereas the other antibiotic resistance gene gets 'inactivated due to insertion' of alien DNA, and helps in selection of recombinants. Origin of replication (ori) is a sequence from where replication starts and any piece of DNA when linked to this sequence can be made to replicate within the host cells. This sequence is also responsible for controlling the copy number of the linked DNA. So, if one wants to recover many copies of the target DNA it should be cloned in a vector whose origin support has high copy number.
Multiple recognition sites in vector generate several fragments, which will complicate the-

A ray incident at 50° on one refracting surface of a prism of angle 60°, suffers a deviation of 40°. The angle of emergence is:

A straight wire of mass 500 g and length 7 m carries a current of 1.4 A. It is suspended in mid air by a uniform horizontal magnetic field B perpendicular to the length of the wire. The magnitude of magnetic field is:

The chromosome number in the meiocyte of a housefly is:

List-I	List-II
(A) Tollen's reagent	(I) Rochelle salt
(B) Jones reagent	(II) Conc. HCl and \(ZnCl _2\)
(C) Lucas reagent	(III) Ammoniacal silver nitrate
(D) Fehling solution	(IV) Chromium trioxide-sulfuric acid

Choose the correct match:

If the corner points of the bounded feasible region for a linear programming problem (LPP) are (0, 2), (3, 0), (6, 0), (6, 8) and (0, 5), then which of the following are correct for the objective function \(Z=4 x+6 y \) ?
(A) The minimum value of the objective function occurs at (0, 2) and (3, 0) only.
(B) The minimum value of the objective function occurs at the mid-point of the line segment joining the points (0, 2) and (3, 0) only.
(C) The minimum value of the objective function occurs at every point of the line segment joining the points (0, 2) and (3,0).
(D) The difference between the maximum value and minimum value of the objective function is 60.
Choose the correct answer from the options given below :