Recent questions in Chemistry

The froth stabilizers, generally used during froth-floatation

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Zone Refing is generally carried out in inert atmosphere

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German silver does not have silver in it,its composition is

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Product in the below reaction is

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The blast of hot air is introduced from tuyeres during extraction of iron at about.

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Among the following the wrong one is

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In goldsmith aluminothermic process, which of the following reducing agent is used.

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Mac Arthur Process is used for

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The major products P and Q are in the below reaction

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An Alloy is formed by mixing.

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The metal that is sometimes found native in nature .

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The one that is used automobiles and aeroplanes is.

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Refer the below reaction A Can be

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Silver containing lead as impurity is removed by.

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$CH_3CH_2CH_2CH_3\quad\underrightarrow {Cl_2/h\nu} \quad A+B$(Monochlorination products).The approximate ratio of percentage yields of $A$ and $B$ formed in the reaction is

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$CH_3CH=CHCH_3+CHCl_3+t-Bu-OK\rightarrow A$.A is

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In the below reaction:A can be

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Which one of the following is not a surfactant ?

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The addition of unsymmetrical reagents to unsymmetrical alkenes occurs in such a way that the negative part of the addendum goes to that carbon atom of the double bond which carries lesser number of hydrogen atoms is called by

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Which of the following phrases correctly explains syneresis ?

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Addition of HCl to 2-methyl-2-butene mainly gives

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At which point of lyophilic colloids , they are expected to have minimum stability ?

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Which of the following statements states the terms ' activity ' and ' selectivity ' respectively ?

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Which of the compound with molecular formula $C_5H_{10}$ yields acetone on ozonolysis?

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Predict the product C obtained in the following reaction of 1-butyne.$CH_3CH_2-C\equiv CH+HCl\rightarrow B\quad\underrightarrow{HI}\quad C$

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Which of the following is the general formula of zeolites ?

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Base strength of $(i)\; H_3CC^{\ominus}H_2,(ii)\;H_2C=C^{\ominus}H$ and $(iii)\;H-C\equiv C^{\ominus}$ is in the order of

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Among the following colloidal solo . Which one is given to a person having poisoning ?

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Which of the following is another name for gold number ?

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In the following sequence of reactions,the alkene affords the compound 'B':$CH_3CH=CHCH_3\quad\underrightarrow {O_3}\quad A\quad\underrightarrow {H_2O}\quad B$.The compound B is

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Which of the following is a positively charged sol ?

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Refer the below:

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What are the type of solution in the two tumblers below respectively ?

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Which of the following on treatment with warm dilute $H_2SO_4$ in the presence of $HgSO_4$ will give butan-2-one?

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Which set of colloidal solutions can be obtained by electrical dispersion / Bredig's are method ?

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Cleavage of ozonide gives aldehyde and ketone if it is carried out using

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By which of the following methods . Gold sol is prepared ?

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Which of the following are examples of nucleophilic addition reaction?

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Which type of solution stated below shows the following properities ? $\;$(1) Homogeneous in nature $\;$ (2) It cant be separated by ultra filtration $\;$ (3) The appearance is transparent .

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Which of the following are obtained to get naphthalene from benzene and succinic anhydride?

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What will happen when $\;NH_{3}\;$ and $\;CO_{2}\;$ is placed on the surface of charcoal separately ?

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100 mL of a colloidal solution is completely precipitated by addition of 5 mL of 1 M NaCl solution . Calculate the coagulation value of NaCl .

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Aqueous solution of following compounds are electrolysed.Acetylene gas is obtained from

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Which of the following species are planar?

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$CH_4$ cannot be obtained by

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What is obtained when a freshly precipitated $\;Fe(OH)_{3}\;$ is shaken with title amount of dilute solution of $\;Fecl_{3}\;$ ?

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o-Xylene on ozonolysis gives

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The coagulation of 100 ml of a colloidal solution of gold is completely prevented by the addition of 0.25 g of starch to it before adding 1 ml of 10% Nacl solution . Calculate the gold number of starch .

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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.Total number of $1^o$ amine structures of a nitrogenous base having molecular formula $C_4H_{11}N$ is

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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.Molecular formula of an alcohol,0.44g of which when treated with $CH_3MgI$ liberates 112ml of $CH_4$ is

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