Recent questions in Chemistry

When Grignard reagent is treated with water,alcohol,ammonia,$1^o$ amine,$2^o$ amine,alkyne-1 or carboxylic acid.We get alkane corresponding to alkyl part of Grignard reagent.In Grignard reagent C-atom is more electronegative than magnesium,hence its alkyl part acts are nucleophile and thus it will take an active hydrogen atom(H-atom that undergoes acylation) or acidic hydrogen atom to give its corresponding alkane.Also it is known that stronger acid displaces weak acid from weak acid salt.$C_6H_5SO_3-H+CH_3-COONa\rightarrow$ Product.The product in the given reaction is

asked Mar 19, 2014 by sreemathi.v

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Which of the following protective colloids has the maximum gold number ?

asked Mar 19, 2014 by yamini.v

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When Grignard reagent is treated with water,alcohol,ammonia,$1^o$ amine,$2^o$ amine,alkyne-1 or carboxylic acid.We get alkane corresponding to alkyl part of Grignard reagent.In Grignard reagent C-atom is more electronegative than magnesium,hence its alkyl part acts are nucleophile and thus it will take an active hydrogen atom(H-atom that undergoes acylation) or acidic hydrogen atom to give its corresponding alkane.Also it is known that stronger acid displaces weak acid from weak acid salt.Structure of hydrocarbon 0.34gm of which when treated with $CH_3MgI$ liberates 112ml of $CH_4$ at STP,will be

asked Mar 19, 2014 by sreemathi.v

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In a coagulation experiment $5 \;mL$ of $\;As_{2}S_{3}\;$ is mixed with disfilled water and $0.1\; M$ solution of an electorlyte $AB$ so that total volume is $10\; mL$ . It was found that all solutions containing more than $4.6\; mL$ of $AB$ coagulate with in $5$ minutes . What is the flocculation value of $AB$ for $\;As_{2}S_{3}\;$ sol ?

asked Mar 19, 2014 by yamini.v

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When Grignard reagent is treated with water,alcohol,ammonia,$1^o$ amine,$2^o$ amine,alkyne-1 or carboxylic acid.We get alkane corresponding to alkyl part of Grignard reagent.In Grignard reagent C-atom is more electronegative than magnesium,hence its alkyl part acts are nucleophile and thus it will take an active hydrogen atom(H-atom that undergoes acylation) or acidic hydrogen atom to give its corresponding alkane.Also it is known that stronger acid displaces weak acid from weak acid salt.In the below equation product is

asked Mar 19, 2014 by sreemathi.v

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Which of the following set is a colloid of solid -Gas i. e. Aerosol .

asked Mar 19, 2014 by yamini.v

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Which of the following terms are also called as chemisorption ?

asked Mar 19, 2014 by yamini.v

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$CH\equiv CH(X)+2CH_3COOH(Y)\rightarrow A\quad \underrightarrow{\Delta}\quad B+C$.B can be obtained from X by hydration and c can be obtained from Y by heating with $P_2O_5$.Hence A is

asked Mar 19, 2014 by sreemathi.v

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Which one of the following has the minimum boiling point?

asked Mar 19, 2014 by sreemathi.v

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Which of the following are correct pertaining to the adsorption of a gas can a solid surface ?

asked Mar 19, 2014 by yamini.v

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Presence of a nitro group in a benzene ring

asked Mar 19, 2014 by sreemathi.v

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At the lowest molar concentration at ambient conditions which among the following surfactant will form micelles in aqueous solution ?

asked Mar 19, 2014 by yamini.v

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Which is the most suitable reagent among the following to distinguish compound (3) from rest of the compound(s)?\[\begin{array}{1 1}(1)\;CH_3C\equiv C-CH_3&(2)\;CH_3-CH_2-CH_2-CH_3\\(3)\;CH_3-CH_2-C\equiv CH&(4)\;CH_3-CH=CH_2\end{array}\]

asked Mar 19, 2014 by sreemathi.v

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Adsorption is generally an

asked Mar 19, 2014 by yamini.v

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At isoelectric point the colloidal particles

asked Mar 19, 2014 by yamini.v

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Which of the following reactions will yield 2,2-dibromopropane?

asked Mar 19, 2014 by sreemathi.v

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Benzene does not undergo addition reactions easily because

asked Mar 19, 2014 by sreemathi.v

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Plot of $\;log\; \large\frac{x}{m}\;$ against $\;log\; P$ is a straight line inclined at an angle of $\;45^{0}\;$ . When the pressure is 0.5 atm and Freundlich parameter , $K$ is $10.6$ , the amount of the solute adsorbed per gram of adsorbed will be $\;(log\; 5 = 0.0990)\;$

asked Mar 19, 2014 by yamini.v

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Which of the following yield both alkane and alkene?

asked Mar 19, 2014 by sreemathi.v

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Adsorption is accompanied by

asked Mar 19, 2014 by yamini.v

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Which one of the following is reduced with zinc and hydrochloric acid to give corresponding hydrocarbon

asked Mar 19, 2014 by sreemathi.v

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$10^{-4}\;g$ of gelatin is required to be added to $\;100\;cm^{3}$ of a standard gold sol to just prevent its coagulation by the addition of $\;1\;cm^{3}$ of $\;10\%\;$ NaCl solution to it . Hence , the gold number of gelatin is

asked Mar 19, 2014 by yamini.v

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The compound formed as a result of oxidation of ethyl benzene by $KMnO_4$ is

asked Mar 19, 2014 by sreemathi.v

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Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid.The product so obtained is diazotised and then heated with cuprous bromide.The reaction mixture so formed contains

asked Mar 19, 2014 by sreemathi.v

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The alkane formed as a major product in the below elimination reaction is

asked Mar 19, 2014 by sreemathi.v

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The colour of a colloidal solution depends upon

asked Mar 18, 2014 by yamini.v

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A colloidal solution of gold in water is

asked Mar 18, 2014 by yamini.v

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The average particle mass in colloidal solutions can be determined by

asked Mar 18, 2014 by yamini.v

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The CMC of a given soap in water is $\;10^{-3}\;molL^{-1}\;.$ A $\;10^{-4}\;molL^{-1}\;$ solution of this soap in water is a

asked Mar 18, 2014 by yamini.v

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Gold numbers of protective colloids A ,B ,C and D are 0.50 , 0.01 , 0,05 and 0.005 respectively , the correct order of their protective powers is

asked Mar 18, 2014 by yamini.v

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Langmuir adsorption isotherm is deduced using the assumption

asked Mar 18, 2014 by yamini.v

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The reactions given below , are the catalyst and corresponding process / reaction are matched , the mismatch is

asked Mar 18, 2014 by yamini.v

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Which of the following species participate in sulphonation of benzene ring?

asked Mar 18, 2014 by sreemathi.v

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A plot of x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to

asked Mar 18, 2014 by yamini.v

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Which of the following reactions shows the formation of positively / negatively charged sol correctly?

asked Mar 18, 2014 by mosymeow_1

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Ozonolysis of $C_7H_{14}$ gave 2-methyl-3-pentanone.The alkene is

asked Mar 18, 2014 by sreemathi.v

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The number of moles of lead nitrate needed to coagulate a mol of colloidal $\;[AgI]I^{-}\;$ is

asked Mar 18, 2014 by yamini.v

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Which of the following can't be used in Friedal-Craft's reactions

asked Mar 18, 2014 by sreemathi.v

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Which among the following statements are connect with respect to adsorption of gases on a solid ?$\; \;$ (1) The extent of adsorption is equal to $\;kp^{n}\;$ according to freundlich isotherm.$\;\;$ (2) The extent of adsorption is equal to $\;kp^{\large\frac{1}{n}}\;$ according to freundlich isotherm . $\;\;$ (3) The extent of adsorption is equal to $\;\large\frac{(a+bp)}{ap}\;$ according to freundlich isotherm . $\;\;$ (4) The extent of adsorption is equal to $\;\large\frac{ap}{(1+bp)}\;$ according to freundlich isotherm . $\;\quad\;$ (5) Freundlich adsorption fails at a low pressure .

asked Mar 18, 2014 by yamini.v

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The product of acid catalysed hydration of 2-phenylpropene is

asked Mar 18, 2014 by sreemathi.v

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Which of the following diagram shows the situation of the $As_2S_3$ particles after electrophoresis?

asked Mar 18, 2014 by mosymeow_1

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The coagulation of 200 mL of a positive colloid took place . When 0.73 g Hcl was added to it without changing the volume much . The flocculation value of Hcl for the colloid is

asked Mar 18, 2014 by yamini.v

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The compounds $X(C_5H_8)$ reacts with ammoniacal $AgNO_3$ to give a white precipitate and on oxidation with hot alkaline $KMnO_4$ gives the acid,$(CH_3)_2CHCOOH$.Therefore X is

asked Mar 18, 2014 by sreemathi.v

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What is the equation form of Langmuir isotherm under high pressure ?

asked Mar 18, 2014 by yamini.v

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Which of the following is used to produce smoke screens ?

asked Mar 18, 2014 by yamini.v

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Which one of the following forms micelles in aqueous above certain concentration .

asked Mar 18, 2014 by yamini.v

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$Ph-C\equiv C-CH_3\quad\underrightarrow{Hg^{2+}/H^+}\quad A.A$ is

asked Mar 18, 2014 by sreemathi.v

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Which of the following explains the process of de-emulsification?

asked Mar 18, 2014 by mosymeow_1

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Which among the following is a non-elastic gel?

asked Mar 18, 2014 by mosymeow_1

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The nodal plane in the $\pi$-bond of ethene is located in

asked Mar 18, 2014 by sreemathi.v

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