Recent questions in JEEMAIN PAST PAPERS

Type of isomerism shown by $[Cr(NH_3)_5 NO_2]Cl_2$ is :

asked Dec 11, 2018 by pady_1

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A square planar complex is formed by hybridisation of the following atomic orbitals :

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Energy of H-atom in the ground state is $-13.6 eV$ , hence energy in the second excited state is :

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End product of the following reaction is : $CH_3CH_2COOH \xrightarrow[\text{$red \; P$}]{\text{$Cl_2$}}$

asked Dec 11, 2018 by pady_1

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Which of the following compounds has incorrect IUPAC nomenclature ?

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Number of atoms in the unit cell of $Na$ (BCC type crystal) and $Mg$ (FCC type crystal) are respectively :

asked Dec 11, 2018 by pady_1

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Geometrical isomerism is not shown by :

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Number of atoms in 560 g of $Fe$ (atomic mass $56\; g \; mol^{-1}$ ) is :

asked Dec 11, 2018 by pady_1

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For the reaction: $H_2 + I_2 \to 2HI$ , the differential rate law is :

asked Dec 11, 2018 by pady_1

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$MnO_4^-$ is a good oxidising agent in different medium changing to $MnO_4^- \to Mn^{2+}$ $\; \; \; \; \; \; \; \;\; \; \to MnO_4^{2-}$ $\; \; \; \; \; \;\; \; \; \to MnO_2$ $\; \; \; \; \; \; \; \; \;\to Mn_2O_3$ Changes in oxidation number respectively are :

asked Dec 11, 2018 by pady_1

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Based on kinetic theory of gases following laws can be proved :

asked Dec 11, 2018 by pady_1

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For a cell given below : $Ag^++ e^- \to Ag \; \; \; \; \; \; \;E^{\circ} = x$ $Cu^{2+} + 2e^- \to Cu, \; \; \; \; E^{\circ} = y$ $E^{\circ} cell$ is :

asked Dec 11, 2018 by pady_1

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RNA contains :

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Consider following two reactions $\begin{align}A \to Product \; -\frac{d[A]}{dt} = k_1 [A]^0 \end{align}$ $\begin{align}B \to Product \; -\frac{d[B]}{dt} = k_2[B] \end{align}$ $k_1$ and $k_2$ are expressed in terms of molarity $(mol\;L^{-1})$ and time $(s^{-1})$ as :

asked Dec 11, 2018 by pady_1

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An aqueous solution of $1M\; NaCl$ and $1M\;HCl$ is :

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The number of lone pairs on $Xe$ in $XeF_2, \; XeF_4$ and $XeF_6$ respectively are :

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Racemic mixture is formed by mixing two :

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Hybridisation of the underline atom changes in :

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One of the following species acts as both Bronsted acid and base :

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$CH_3MgI$ is an organometallic compound due o :

asked Dec 11, 2018 by pady_1

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For a reaction $A + 2B \to C$ , rate is given by $+\frac{d[C]}{dt} = k[A][B]$ , hence the order of the reaction is :

asked Dec 11, 2018 by pady_1

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Bond angle of $109^{\circ}28'$ is found in :

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Underlined carbon is $sp^3$ hybridised in :

asked Dec 11, 2018 by pady_1

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For an aqueous solution, freezing point is $-0.186^{\circ}C$ . Elevation of the boiling point of the same solution is $(K_f = 1.86^{\circ} mol^{-1} kg$ and $K_b = 0.512^{\circ} mol^{-1}kg)$ :

asked Dec 11, 2018 by pady_1

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Aluminium is extracted by the electrolysis of :

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Refining of impure copper with zinc impurity is to be done by electrolysis using electrodes as :

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In a mixture of A and B, components show negative deviation when :

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$\beta$ - particle is emitted in a radioactive reaction when :

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Heat required to raise the temperature of 1 mole of a substance by $1^{\circ}$ is called :

asked Dec 11, 2018 by pady_1

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Solubility of $Ca(OH)_2$ is $s \; mol\; L^{-1}$ . The solubility product $(K_{sp})$ under the same condition is :

asked Dec 11, 2018 by pady_1

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In an organic compound of molar mass $108 \;g \; mol^{-1} C, \; H$ and $N$ atoms are present in $9 : 1 : 3.5$ by weight. Molecular formula can be :

asked Dec 11, 2018 by pady_1

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If $Fe^{3+}$ and $Cr^{3+}$ both are present in group III of qualitative analysis, then distinction can be made by :

asked Dec 11, 2018 by pady_1

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A substance forms Zwitter ion. It can have functional groups :

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The most stable ion is :

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Half-life of a substance A following first order kinetics is 5 days. Starting with 100 g of A, amount left after 15 days is :

asked Dec 11, 2018 by pady_1

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A metal M forms water soluble $MSO_4$ and inert $MO$ . $MO$ in aqueous solution forms insoluble $M(OH)_2$ soluble in $NaOH$ . Metal $M$ is :

asked Dec 11, 2018 by pady_1

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Following reaction $(CH_3)_3 CBr + H_2O \to (CH_3)_3 COH + HBr$ is an example of :

asked Dec 11, 2018 by pady_1

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Cyanide process is used for the extraction of :

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Which of the following concentration factor is affect by change in temperature ?

asked Dec 11, 2018 by pady_1

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Which of the following reaction is possible at anode ?

asked Dec 11, 2018 by pady_1

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On heating benzyl amine with chloroform and ethanolic $KOH$ , product obtained is :

asked Dec 11, 2018 by pady_1

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Acetylene reacts with hypochlorous acid to form :

asked Dec 11, 2018 by pady_1

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For the following cell with hydrogen electrodes at two different pressure $p_1$ and $p_2$

asked Dec 11, 2018 by pady_1

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Compound A given below is :

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Acetylene does not react with :

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Which of the following ions has the maximum magnetic moment ?

asked Dec 11, 2018 by pady_1

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$KO_2$ is used in space and submarines because it :

asked Dec 11, 2018 by pady_1

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Number of $P-O$ bonds in $P_4O_{10}$ is :

asked Dec 11, 2018 by pady_1

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For an ideal gas, number of mol per litre in terms of its pressure P, temperature T and gas constant R is :

asked Dec 11, 2018 by pady_1

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Which of the following is a redox reaction ?

asked Dec 11, 2018 by pady_1

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