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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.
Which of the following has the highest flocculating power for a positive sol?

Amongst the following, identify the condensation polymer/s:
(A)Bakelite
(B) Teflon
(C) Melamine formaldehyde resin
(D) Nylon-2 nylon-6
(E) Buna-S
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In the formation of coordination complexes, if the inner \(d\) orbital \((n - 1)d\) is used in hybridisation, the complex, is called an inner orbital or low spin or spin paired complex. And if it uses outer \(d\) orbital \((nd)\) in hybridisation (like \(sp^3d^2\)), it is called outer orbital or high spin or spin free complex. The degeneracy of the \(d\) orbitals has been removed due to ligand electron-metal electron repulsions in the complex. This splitting of the degenerate levels due to the presence of ligands in a definite geometry is termed as crystal field splitting. For coordination complexes, the magnetic moment is determined by the number of unpaired electrons and is calculated by using the 'spin-only' formula, \(\mu = \sqrt{n(n+2)}\) where \(n\) is the number of unpaired electrons and \(\mu\) is the magnetic moment in units of Bohr magneton \((BM)\). The coordination compounds are of great importance. These compounds are widely present in the mineral, plant and animal worlds and are known to play many important functions in the area of analytical chemistry, metallurgy, biological systems, industry and medicine.
Which of the following metals belongs to Wilkinson catalyst?

The quantity of charge required to obtain \(2\text{ mol}\) of \(\text{Mn}^{2+}\) from \(\text{MnO}_4^{-}\) is:

On mixing A and B, a warm solution is obtained which is \textbf{not} true for the above solution?

Match List - I with List - II. 

List – I	List – II
(A) SN1 reaction	(I) vic-dibromide
(B) Bromination of alkenes	(II) gem-dibromide
(C) Alkylidene halides	(III) Racemisation
(D) Dehydrohalogenation of haloalkanes	(IV) Saytzeff rule

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Match the property given in List-l with the element given in List-Il

List-I (Property)	List-ll (Element)
(A) Lanthanoid, which can show +2 oxidation state	(I) Pm
(B) Radioactive lanthanoid	(II) Lu
(C) Lanthanoid which has \(4 f^{\wedge} 7\) electronic configuration in +3 oxidation state	(III) Eu
(D) Lanthanoid which has \(4 f^{\wedge}\{14\}\) electronic configuration in +3 oxidation state	(IV) Gd

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Area of a rectangle having vertices \(P, Q, R\) and \(S\) with position vectors \(-\hat{i}+\frac{1}{2} \hat{j}+4 \hat{k}, \hat{i}+\frac{1}{2} \hat{j}+4 \hat{k}, \hat{i}-\frac{1}{2} \hat{j}+4 \hat{k}\) and \(-\hat{i}-\frac{1}{2} \hat{j}+4 \hat{k}\) respectively is :

A compound forms hexagonal closed packed structure. What is the number of tetrahedral voids in \(0.8\text{ mol}\) of it?

Match the catalysts given in List - I with the process catalyzed by them given in List - II

List - I (Catalyst)	List - II (Process)
(A) Ni in presence of Hydrogen	(I) Ziegler Natta Catalyst
(B) Finely divided iron	(II) Vegetable oil to ghee
(C) \(TiCl _4+ Al \left( CH _3\right)_3\)	(III) Sandmeyer reaction
(D) \(Cu _2 Cl _2\)	(IV) Haber's process

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The diagonal elements of a skew symmetric matrix are all

When the electron in a hydrogen atom jumps from the 2nd orbit to the 1st orbit, the wavelength of the radiation emitted is \(\lambda\).
When the electron jumps from the 3rd orbit to the 1st orbit, the wavelength of emitted radiation is:

Which of the following are not involved in intra uterine devices?
(A) Lippes Loop
(B) LNG-20
(C) Saheli
(D) Implants
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