Recent questions in Chemistry

$K_4[Fe(CN)_6]$ can be used to detect one or more out of $Fe^{2+}, Fe^{3+}, Zn^{2+}, Cu^{2+}, Cd^{2+}$

asked Jan 28, 2014 by mosymeow_1

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In castner-kellner cell used for the manufacture of NaOH,the cathode in the central compartment is made up of

asked Jan 28, 2014 by sreemathi.v

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The salt used for performing bead test in inorganic qualitative analysis is

asked Jan 28, 2014 by sreemathi.v

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$NH_4CNS$ can be used to test one or more out of $Fe^{3+}, Co^{2+}, Cu^{2+}$

asked Jan 28, 2014 by mosymeow_1

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Four alkali metals A,B,C and D are having standard electrode potentials as -3.05,-1.66,-0.40 and 0.80v respectively,which one will be the most reducing agent?

asked Jan 28, 2014 by sreemathi.v

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$CO+NaOH\rightarrow $?

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The metal which gives brick red colour in flame test is

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Oxides of alkaline earth metals are stable due to

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The salt which gives crimson red colour in flame test is

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To what series does the spectral lines of atomic hydrogen belong if its wave number is equal to the difference between the wave numbers of the following two lines of the Balmer series 486.1 and 410.2 nm?

asked Jan 28, 2014 by sharmaaparna1

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Which of the following metals cannot give flame tests?

asked Jan 28, 2014 by sreemathi.v

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The electrical conductivity in aqueous solutions is high for

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Which does not form peroxides?

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A series of lines in the spectrum of atomic H lies at wavelengths 656.46 , 486.27 , 434.17 , 410.29 mm. what is the wavelength of next line in this series?

asked Jan 28, 2014 by sharmaaparna1

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Magnesium burns in air giving two products .Their formulae are

asked Jan 28, 2014 by sreemathi.v

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Oxygen evolves on heating

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$BeH_2$ and $MgH_2$ are prepared using the reagent

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The elements that reacts with cold water

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The polorising power of $Mg^{2+}$ is nearly same as that of

asked Jan 28, 2014 by sreemathi.v

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A hydrogen like atom (atomic No. Z) is in a higher excited state of quantam number n. This excited atom can make a transition to the first excited state by successively emitting two photons of energies 10.20 eV and 17.00 eV respectively. alternatively the atom from the same excited state can make a transition to the second excited state by successively emitting two photons of energy 4.25eV and 5.95 eV respectively. Determine the values of n and Z.

asked Jan 28, 2014 by sharmaaparna1

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Which of the following is less covalent?

asked Jan 28, 2014 by sreemathi.v

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Hardening of plaster of paris is because of

asked Jan 28, 2014 by sreemathi.v

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Potassium ferrocyanide is used in the detection of

asked Jan 28, 2014 by mosymeow_1

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A compound of Vanadium has a magnetic moment of 1.73 Bm. Work out the electric configuration of the Vanadium ion in the compound.

asked Jan 28, 2014 by sharmaaparna1

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In the fourth group, $Mn(OH)_2$ on heating with $PbO_2$ and conc. $HNO_3$ gives pink colour due to the formation of

asked Jan 28, 2014 by mosymeow_1

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In the hardening stage of plaster of paris,the compound formed is

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To aviod the precipitation of hydroxide of $Ni^{2+}, Co^{2+}, Mn^{2+}$ along with those of the third group cations, the solutions should be

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Passivity is exhibited by

asked Jan 28, 2014 by sreemathi.v

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Mark the compound which turns black with $NH_4OH$

asked Jan 28, 2014 by mosymeow_1

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Which of the following is an alkaline earth?

asked Jan 28, 2014 by sreemathi.v

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Chromyl chloride vapours are dissolved in water and acetic acid and lead acetate solution is added, then

asked Jan 28, 2014 by mosymeow_1

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The metal carbonate which decomposes easily on heating is

asked Jan 28, 2014 by sreemathi.v

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Which of the following has no existance as a solid?

asked Jan 28, 2014 by sreemathi.v

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The least ionic chloride is given by

asked Jan 28, 2014 by sreemathi.v

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In a combination of $NO_3^-, Br^-$ and $I^-$ present in a mixture, $Br^-$ and $I^-$ interfere in the ring test for $NO_3^-$. These are removed by adding a solution of

asked Jan 28, 2014 by mosymeow_1

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The alkaline earth metal whose carbonate has no natural occurence is

asked Jan 28, 2014 by sreemathi.v

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$BaCl_2$ solution gives a white ppt. with a solution of a salt, which dissolves in dil. HCl with the evolution of a colourless, pungent smelling gas. The acid radical in the salt is

asked Jan 28, 2014 by mosymeow_1

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To a solution of a salt, $MgSO_4$ solution is added and white ppt. appears only on heating. The acid radical in the salt is

asked Jan 28, 2014 by mosymeow_1

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Consider the following reaction $6NaOH+3Cl_2\rightarrow 5NaCl+A+3H_2O$ what is the oxidation number of chlorine in "A"?

asked Jan 28, 2014 by sreemathi.v

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On heating a mixture of potassium dichromate and sodium chloride with concentrated sulphuric acid in a dry test tube, the compound formed

asked Jan 28, 2014 by mosymeow_1

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Aqueous solution of $Na_2O_3$ is

asked Jan 28, 2014 by sreemathi.v

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Nitrate is confirmed by ring test. The brown colour of the ring test is due to the formation of

asked Jan 28, 2014 by mosymeow_1

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A mixture of soda ash and pearl ash is known as

asked Jan 28, 2014 by sreemathi.v

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$Li,Na$ and $K$ burn is excess of air to form

asked Jan 28, 2014 by sreemathi.v

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$Na$ and $Li$ are burnt in dry air we get

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Oxone is a compound of

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Sodium amalgam is used as

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Alkali metals are

asked Jan 27, 2014 by sreemathi.v

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Which of the following does not give metal oxide on heating

asked Jan 27, 2014 by sreemathi.v

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unpaired electrons $(e^-)$ are present in

asked Jan 27, 2014 by sreemathi.v

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