Recent questions in Chemistry

Iodine reacts with $Na_2S_2O_3$ (aq) to give products which are

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Lead has been placed in the group I and II because

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Suspended impurities from a colloidal solution of gum in water can be removed by

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Which of the following can be enthalpy of neutralisation of a weak acid and a strong base?

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If enthalpy of neutralisation of $dil\; HCl$ and $NaOH\; (aq)$ is $x$ then enthalpy of neutralisation of dil HI and $Ba(OH)_2\; (aq)$ is

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Which of the following precipitates $K^+$ from its solution?

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Which of the following is insoluble in dil. $HNO_3$ but soluble in aqua regia?

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When $H_2S$ is passed through an ammoniacal salt solution X, a white ppt. is obtained. Then X can be a

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Distinguishing reagent between silver and lead salts

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$H_2S$ in the presence of HCl precipitates group II but not group IV because

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Concentrated nitric acid is added before proceeding to test for group III members. This is to

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Mg is not precipitated in group V because

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The ion that cannot be precipitated by both HCl and $H_2S$ is

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Which of the following solution gives precipitate with $Pb(NO_3)_2$ but not with $Ba(NO_3)_2$ ?

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An aqueous solution of salt gives white precipitate with $AgNO_3$ solution as well as with dil $H_2SO_4$. It may be

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In a mixture having nitrite and nitrate can be destroyed by heating with

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For the test of halides, the soda extract is acidified with

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Formation of purple colour on the addition of sodium nitroprusside to sodium carbonate extract indicates the presence of

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A salt solution is acidified with dil. $HCl$ and $BaCl_2$ solution is added. A white ppt. is formed. The salt contains

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Which one of the following cation will give a blue coloured ash when a piece of filter paper dipped in a solution containing its salt and $Co(NO_3)_2$ is burned?

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$H_2S$ and $SO_2$ can be distinguished by

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Acidified $K_2Cr_2O_7$ turns green by

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An inorganic salt when heated evolves a coloured gas which bleaches moist litmus paper. The evolved gas is

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Heating of oxalic acid with conc. $H_2SO_4$ gives

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A test tube containing a nitrate and another containing a bromide and $MnO_2$ are treated with conc. $H_2SO_4$. The brown fumes evolved are passed through water. The water will be coloured by

asked Feb 1, 2014 by mosymeow_1

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When a salt is heated with dil $H_2SO_4$ and $KMnO_4$ solution, the pink colour of $KMnO_4$ is discharged, the mixture contains:

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When borax is heated in a platinum loop, the transparent bead formed contains

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The most suitable indicator for the titrations of $Ba(OH)_2$ against HI is

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If $pK_{in}$ of an indicator is 10.5, the pH transition range for which it is most suitable is

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The most suitable indicator for the titration of HCOOH against NaOH is

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Completion of diazotisation can be checked with

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$C_6H_5OH$ and $C_2H_5OH$ can be distinguished by

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Which of the following compound will give blood red colour while doing the Lassigne's test for N?

asked Feb 1, 2014 by mosymeow_1

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The dissociation energy of $H_2$ is 430.53 KJ$mol^{-1}$. If $H_2$ is exposed to radiation energy of wavelength 253.7nm, what % of radiant energy will be converted into kinetic energy ?

asked Feb 1, 2014 by sharmaaparna1

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A certain dye absorbs light of $\lambda = 4530 A^{\large\circ}$ and then fluorescence light of $5080 \;A^{\large\circ}$ Assuming that under given conditions $47\%$ of the absorbed energy is re-emmited out as fluorescence, Calculate the ratio of Quantum emitted out to the no. of quanta absorbed

asked Feb 1, 2014 by sharmaaparna1

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$O_2$ undergoes photochemical dissociation into one normal oxygen atom and one oxygen atom, 1.967 eV more energetic than normal. The dissociation of $O_2$ into two normal atoms of oxygen requires 498 KJ$mol^{-1}$.what is the maximum wavelength effective for photochemical dissociation of $O_2$ ?

asked Feb 1, 2014 by sharmaaparna1

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Which one of the following has a square planar geometry

asked Jan 31, 2014 by sreemathi.v

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How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with $Ca^{2+}$ ion

asked Jan 31, 2014 by sreemathi.v

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In $Fe(CO)_5$,the $Fe-C$ bond poses

asked Jan 31, 2014 by sreemathi.v

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The IUPAC name of the complex $[CO(NO_2)(NH_3)_5]Cl_2$ is

asked Jan 31, 2014 by sreemathi.v

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Which of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour

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Which of the following compound shows optical isomerism

asked Jan 31, 2014 by sreemathi.v

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IUPAC name of coordination compound $K_3[Fe(CN)_6]$ is

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Calomol $(Hg_2Cl_2)$ on reaction with ammonium hydroxide gives

asked Jan 31, 2014 by sreemathi.v

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The oxidation state of Cr in the complex $[Cr(NH_3)_4Cl_2]^+$ is

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The correct order of magnetic moments (spin only values in B.M) among is

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Which one of the following has largest no of isomers

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Which one of the following complexes is an outer orbital complex

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A reduction in atomic size with increase in atomic number is a characterstic of elements of

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In the coordination compound,$K_4[Ni(CN)_4]$ the oxidation state of nickel is

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