Recent questions in JEEMAIN-2014

How many optically active teroisomers are possible for butane 2,3 -diol?

asked Apr 10, 2015 by meena.p

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Gun metal is an alloy of

asked Apr 10, 2015 by meena.p

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Which enzyme coverts glucose into ethanol

asked Apr 10, 2015 by meena.p

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Four one liter flasks are separately filled with the gases $O_2,f_2,CH_4$ and $CO_2$ under the same conditions. The ratio of number of molecules in these gases.

asked Apr 10, 2015 by meena.p

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The possible mechanism of addition reaction between ethene and bromine in non polar medium would be

asked Apr 10, 2015 by meena.p

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The number of phases present in colloIdal solution is

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Calomel is

asked Apr 10, 2015 by meena.p

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The oxidation state of $Fe$ in iron penta carbonyl is

asked Apr 9, 2015 by meena.p

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$C_7H_8$ show how many isomers.

asked Apr 9, 2015 by meena.p

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The lubricating action of an oil is more if it possess

asked Apr 9, 2015 by meena.p

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The compound that is most reactive towards electrophilic nitration is

asked Apr 9, 2015 by meena.p

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According to bothr's theory , the angular momentum of an electron in 5th orbit is

asked Apr 9, 2015 by meena.p

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A burning strip of magnesium is introduced into a jar containing a gas. After sometime the walls of the container are coated with carbon. The gas in the container is

asked Apr 9, 2015 by meena.p

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The amount of heat released during the reaction of $300 \;mL$ of $1M\;HCl$ with $100\;mL$ of $1M\;NaOH$ is

asked Apr 9, 2015 by meena.p

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In context with the industrial preparation of hydrogen water gas $(CO+H_2)$ , Which of the following is the correct statement ?

asked Apr 9, 2015 by meena.p

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When an electric current of $0.5\;ampere$ passed through acidulated water for two hours then volume of hydrogen $(H_2)$ at $NTP$ produced at cathode will be.

asked Apr 9, 2015 by meena.p

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Which one of the following pair of species have the same bond order ?

asked Apr 9, 2015 by meena.p

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In the gaseous phase reaction : $A_2(g) \to B(g) +\bigg( \large\frac{1}{2}$ $C(g)$ the increase in pressure from 100 mm to 120 mm is noticed in 5 minute. The rate of disappearance of $A_2$ in mm $min^{-1}$ is

asked Apr 9, 2015 by meena.p

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The organic chloro compound , Which shows completed stereo chemical inversion during $SN_2$ reaction is

asked Apr 9, 2015 by meena.p

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The ionization enthalpy of hydrogen atom is $1.312 \times 10^6\;J\;mol^{-1}$ . The energy required to exit the electron in the atom from $n=1\;to \;n=2$ is

asked Apr 9, 2015 by meena.p

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Phenol, When it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives,

asked Apr 9, 2015 by meena.p

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A buffer solution has equal volume of $0.2\;M,NH_4OH$ and $0.02 \;MNH_4 Cl$ . The Pkb of the base is 5. the $PH$ is

asked Apr 8, 2015 by meena.p

1 answer

Which one is reversible process : -

asked Apr 8, 2015 by meena.p

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Which of the following factors is of no significance for roasting sulfide oxe to the oxides and not subjecting the sulfide are to carbon reduction directly ?

asked Apr 8, 2015 by meena.p

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Which of the following factors is of no significance for roasting sulfide oxe to the oxides and not subjecting the sulfide are to carbon reduction directly ?

asked Apr 8, 2015 by meena.p

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Mortar is a mixture of

asked Apr 8, 2015 by meena.p

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The solubility of carbonates decrease down the omagnesium group due to decrease in

asked Apr 8, 2015 by meena.p

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Sodium amalgam is used as

asked Apr 8, 2015 by meena.p

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The treatment of $CH_3Mgx$ with $CH_3 C \equiv C-H$ produce

asked Apr 8, 2015 by meena.p

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The formation of the oxide ion $0^{2-} (g)$ requires first on exothermic and then an endothermic step. $O_{(g)} +e^- \to O^{-} _{(g)}; \Delta r^{\circ} =-142\;kj mol^{-1}$ $O_{(g)} +e^- \to O^{2-}_{(g)}; \Delta r^{\circ} =+844\;kj mol^{-1}$ This is because of

asked Apr 8, 2015 by meena.p

1 answer

With increase in temperature , which of these changes?

asked Apr 8, 2015 by meena.p

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In the castner's process for the extraction of sodium , the anode is made of ________ metal.

asked Apr 8, 2015 by meena.p

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In organic reactions, sodium in liquid ammonia is used as

asked Apr 8, 2015 by meena.p

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Which is the oxidation number of cr in $K_2Cr_2O_7$ ?

asked Apr 8, 2015 by meena.p

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Amount of oxalic and present in a solution can be determined by its nitration with $kM_nO_4$ solution in the presence of $H_2SO_4$ . The nitration gives unsatisfactory result when carried out in the presence of Hcl because Hcl

asked Apr 8, 2015 by meena.p

1 answer

The first order reaction is $20 \%$ complete in 10 minutes. calculate the time taken for the reaction to go to $80\%$ completion

asked Apr 8, 2015 by meena.p

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The $pKa$ of a weak acid, $HA$ is $4.80$ . The $pKb$ of a weak base BOH is $4.78$ . The PH of an aqueous solution of the corresponding salt, BA will be

asked Apr 8, 2015 by meena.p

1 answer

The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

asked Apr 8, 2015 by meena.p

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A gas expands by $0.5$ liter against a constant pressure of one atmosphere . Calculate the work done in joule.

asked Apr 8, 2015 by meena.p

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What is the ratio between the energies of two radiations one with a wave lebgth of $6000A^{\circ}$ and other with $2000 A^{\circ}$ ?

asked Apr 8, 2015 by meena.p

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What is the ratio between the energies of two radiations one with a wave lebgth of $6000a^{\circ}$ and other with $2000 A^{\circ}$ ?

asked Apr 8, 2015 by meena.p

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The most abundant metal in earth 's trust is

asked Apr 8, 2015 by meena.p

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Calculate the mass of 1.5 gram molecule of sulphuric acid .

asked Apr 8, 2015 by meena.p

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The reaction toluene with chlorine in presence of ferric chloride gives predominately

asked Apr 8, 2015 by meena.p

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The total number of electrons in one molecule of carbon dioxide is :

asked Apr 8, 2015 by meena.p

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In reaction $6NaOH +3cl_2 \to 5 Nacl +A+3 H_2O$ . The oxidation number in 'A' is

asked Apr 8, 2015 by meena.p

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$Zn^{2+}$ dissolves in excess of $NaOH$ due to the formation of :

asked Apr 7, 2015 by meena.p

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Aqueous sodium hydroxide reacts with white phosphorous to form phosphine and

asked Apr 7, 2015 by meena.p

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The total charge required for complete electrolysis is

asked Apr 7, 2015 by meena.p

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Of the following , the metal that cannot be obtained by electrolysis of aqueous solution of their salt are

asked Apr 7, 2015 by meena.p

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