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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. smaller the gold number of a protective colloid, the greater is its protective action. purification of colloidal solution ?
Evidently, Which of the following methods cannot be used for

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Adsorption is a surface phenomenon and it differs from absorption which occurs throughout the body of the substance that absorbs. In physiosorption the attractive forces are mainly van der Waal's forces while in chemisorption ionic/covalent bonds are formed between particles of adsorbent and adsorbate. The catalytic activity of finely divided iron in Haber's process of ammonia manufacture can be explained by adsorption theory. Adsorption being an exothermic process, the heat of adsorption is utilised in enhancing the rate of the reaction. Adsorption has many applications being used in gas masks, control of humidity, chromatograph separation, curing diseases etc.
Which of the following is not a surface phenomenon?

Match List-l with List-ll

List-I	List-II
(A) Gatterman-Koch reaction	(I) \(\ CrO_2CI_2/CS_2\)
(B) Rosenmund reduction	(II) Acyl chloride and anhyd.\(\ AICI_3\)
(C) Etard reaction	(III) CO, HCI, \(\ AICI_3\)CuCl
(D) Friedel Craft acylation	(IV) \(\ H_2/Pd-BaSO_4\)

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Replacement of a hydrogen atom in a hydrocarbon by an alkoxy or carboxyl group yields a class of compounds known as ethers. Ethers are classified as symmetrical or unsymmetrical on the basis of groups attached to the oxygen atoms. Diethyl ether, a symmetrical ether, has been widely used as an inhalation anesthetic. Ethers can be prepared by acid catalyzed intermolecular dehydration of alcohols and Williamson's synthesis. Acid catalyzed dehydration of alcohols is not generally preferred as it gives a mixture of elimination and substitution products. In Williamson's synthesis, an alkyl halide is allowed to react with sodium alkoxide. Ethers containing substituted Alkyl groups may also be prepared by this method. The C-O bond in ether is weakly polar and is cleaved under drastic conditions with excess of hydrogen halides. In electrophilic substitution, the alkoxy group deactivates the aromatic ring and directs the incoming group to ortho and para positions.
Which type of ether is anisole ?

Which of the following compound will undergo Cannizzaro reaction?

Give IUPAC name of the following compound:
\(CH_3-CH_2-CH_2-CH(Br)-CH\left(CH_3\right)-CH_2-CHO\)

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The coordination compounds are of great importance. These compounds are widely present in the mineral, plants and animal world and are known to play many important functions in the area of analytical chemistry, metallurgy, biological systems, industry and medicine. For example, coordination compounds find use in many qualitative and quantitative chemical analysis. Some important metal extraction and purification make use of complex formation. Hardness of water can be estimated by stable complex formation of Ca\(^{2+}\) and Mg\(^{2+}\)
From which coordination complex, gold is recovered by reducing this complex with Zn ?

\((p+q)^2=p^2+2 p q+q^2=1\) represents Hardy Weinberg equation. It is used in:

A first order reaction is 50% completed in \(1.26 \times 10^{14}\) s.
How much time would it take for 100% completion?

Let \(\tan ^{-1} y=\tan ^{-1} x+\tan ^{-1}\left(\frac{2 x}{1-x^2}\right)\). Then \(y\) is :

The instantaneous magnetic flux linked with a coil is given by \(\phi = (15t^3 - 100t^2 + 40)\) Wb. The emf induced in the coil at time \(t = 1\) s is :

Which of the following compounds will give a pair of enantiomers upon nucleophilic substitution reaction with a hydroxide ion?

The principal value of \(\operatorname{cosec}^{-1} \left(\frac{2}{\sqrt{3}}\right)\) is: