Recent questions in Chemistry

The $pK_a$ values of four carboxylic acids are given below. Identify the weakest carboxylic acid.

asked Sep 19, 2013 by meena.p

1 answer

The structure of PCC is :

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The product formed in the reaction of phenol with $Br_2$ dissolved in $CS_2$ at $0^{\circ}$ are :

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Heating chloroform with aqueous sodium hydroxide solution forms:

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In which of the following properties, the two enantiomers of lactic acid differ from each other?

asked Sep 19, 2013 by meena.p

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Assertion (A): $-NH_2$ group of aniline is ortho, para directing in electrophilic substitutions. Reason (R) : $-NH_2$ group stabilizes the arenium ion formed by the ortho, para attack of the electrophile.

asked Sep 19, 2013 by meena.p

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$C_2H_6 \to C_2H_4+H_2$ above reaction is called as ___________ .

asked Sep 19, 2013 by meena.p

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Which one of the following gives Prussion blue colour?

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Cataract and skin cancer are caused by _________ .

asked Sep 19, 2013 by meena.p

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Which of the following is not added during the extraction of silver by cyanide process?

asked Sep 19, 2013 by meena.p

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A compound absorbs light in the wavelength region 490-500 nm. Its complementary colour is:

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Liquid $\underline{X}$ is used in Bubble chamber to detect neutral mesons and gamma photons. Then , $\underline{X}= \underline{X}$

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1 answer

The role of copper diaphragm in Whytlaw-Gray's method is :

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$Na_2S_2O_3$ reacts with moist $Cl_2$ to from $Na_2SO_4,HCl$ and $\underline{X}.$ Which one of the following is $\underline{X}$ ?

asked Sep 19, 2013 by meena.p

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Which one of the following is not correct?

asked Sep 19, 2013 by meena.p

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How many corner's of $SiO_4$ unit are shared in the formation of three dimensional silicates?

asked Sep 19, 2013 by meena.p

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Diborane reacts with HCl in the presence of $AlCl_3$ and liberates:

asked Sep 19, 2013 by meena.p

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Solution "X" contains $Na_2 CO_3$ and $NaHCO_3.\;20 \;ml$ of $X$ when titrated using methyl orange indicator consumed $60\; ml$ of $0.1\;M\;HCl$ solution. In another experiment, $20 \;ml$ of X solution when titrated using phenolphthalein consumed $20\;ml$ of $0.1\;M\;HCl$ solution. The concentration (in mol $lit^{-1}$ ) of $Na_2CO_3$ and $NaHCO_3$ in X are respectively.

asked Sep 19, 2013 by meena.p

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Observe the following statements:

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Match the following

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For which one of the following reactions,the entropy change is positive?

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The $pH$ of a buffer solution made by mixing $25\;ml$ of $\;0.02\;M\;NH_4OH$ and $25\;ml$ of $\;0.2\;M\;NH_4Cl$ at $25^{\circ}C$ is : $(pK_b\;of\;NH_4OH=4.8)$

asked Sep 19, 2013 by meena.p

1 answer

The degree of ionization of $\;0.10\;M$ lactic acid is $4.0 \%$

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Which one of the following plots is correct for a first reaction?

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The number of octahedral and tetrahedral holes respectively present in a hexagonal close packed (hcp) crystal of 'X' atoms are :

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The extent of charge of lead accumulator is determined by

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During the electrolysis of copper sulphate aqueous solution using copper electrode, the reaction taking place at the cathode is :

asked Sep 19, 2013 by meena.p

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The vapour pressure in mm of $Hg,$ of an aqueous solution obtained by adding 18 g of glucose $(C_6H_{12}O_6)$ to $180\;g$ of water at $100^{\circ}$ is :

asked Sep 18, 2013 by meena.p

1 answer

Which one of the following is an isotonic pair of solutions?

asked Sep 18, 2013 by meena.p

1 answer

At $T(k),$ the ratio of kinetic energies of $4\;g$ of $H_{2_{(g)}}$ and $8\;g$ of $O_{2_{g}}$ is :

asked Sep 18, 2013 by meena.p

1 answer

Which one of the following is an example of disproportionation reaction?

asked Sep 18, 2013 by meena.p

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Which one of the following statement is correct?

asked Sep 18, 2013 by meena.p

1 answer

Identify the correct set:

asked Sep 18, 2013 by meena.p

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The number of elements present in fourth period is :

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The basic of quantum mechanical model of an atom is :

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The number of radial nodes of $3s$ and $2p$ orbitals respectively are :

asked Sep 18, 2013 by meena.p

1 answer

Nucleides having different mass number and different atomic number, but the same number of neutrons are called ...................... .

asked Sep 12, 2013 by meena.p

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The coordinating number of the ions in the CsCI crystal lattice is ................. .

asked Sep 12, 2013 by meena.p

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A few drops of an organic compound (liquid) are added to schiff's reagent. A pink colour is produced. The organic compound is ................. .

asked Sep 12, 2013 by meena.p

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$0.1\;M\;HCL$ solution is diluted by $100\;times$ . The pH of the solution so formed is .............. .

asked Sep 12, 2013 by meena.p

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The kinetic energy of 8g of $H_2$ at $27^{\circ}C$ is ................. times more than the kinetic energy of $8g$ of $O_2$ at the same temperature.

asked Sep 12, 2013 by meena.p

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The weight of oxalic acid crystals $H_2C_2O_2.2H_2O$ required to prepare $500\;mL$ of $0.2\;N$ solution is ................... .

asked Sep 12, 2013 by meena.p

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Aqueous solution of $FeCl_3$ is acidic because of .............. .

asked Sep 12, 2013 by meena.p

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The half life of a radioactive substance is $100$ sec. It's disintegration constant is ..................... .

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In the reaction $^{19}_8 O+_1H^2 \to ^{18}_8O+X,X$ is ................... .

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The reaction between .............. Baeyer reagent gives ethylene glycol.

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Water has a higher boiling point than corresponding hydrides $H_2S,H_2Se$ and $H_2Te$ . This is because of ............. in water.

asked Sep 12, 2013 by meena.p

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The normal boiling point of, $CS_2,H_2O$ and $CCl_4$ are $41.3^{\circ}C,100^{\circ}C$ and $77^{\circ}C$ respectively. The liquid in which the inter molecular forces are the weakest is ................ .

asked Sep 12, 2013 by meena.p

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The magnetic quantum number $m$ for the outermost electron in the Na atom is .............. .

asked Sep 12, 2013 by meena.p

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Besides $SiO_2$ and $Al_2O_3$ the other major ingradient in portland cement is ................. .

asked Sep 12, 2013 by meena.p

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