Recent questions in JEEMAIN PAST PAPERS

If $f : R^+ \to R$ , such that $f(x) = \log_3x$ , then $f^{-1}(x)$ is equal to :

asked Dec 19, 2018 by pady_1

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Silica is soluble in :

asked Dec 19, 2018 by pady_1

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Which of the following does not participate in the Solvay's process for the manufacture of $Na_2CO_3$ ?

asked Dec 19, 2018 by pady_1

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Among the following compounds which have more than one type of hybridization for carbon atom : 1. $CH_3.CH_2.CH_2.CH_3$ 2. $CH_3.CH= CH.CH_3$ 3. $CH_2 = CH - CH = CH_2$ 4. $H-C = C-H$

asked Dec 19, 2018 by pady_1

1 answer

$C_2H_5CHO$ and $(CH_3)_2CO$ can be distinguished by testing with :

asked Dec 19, 2018 by pady_1

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If the equilibrium constant for the reaction $2AB \rightleftharpoons A_2 + B_2$ is 49; what is the value of equilibrium constant for $AB \rightleftharpoons \frac{1}{2}A_2 +\frac{1}{2}B_2$ ?

asked Dec 19, 2018 by pady_1

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Acetaldehyde when treated with dilute $NaOH$ gives :

asked Dec 19, 2018 by pady_1

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The reagent used for converting ethanoic acid to ethanol is :

asked Dec 19, 2018 by pady_1

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When an alkyl halide reacts with an alkoxide the product is:

asked Dec 19, 2018 by pady_1

1 answer

Compound A reacts with $PCl_5$ to give B which on treatment with $KCN$ followed by hydrolysis gave propanoic acid. What is A and B respectively ?

asked Dec 19, 2018 by pady_1

0 answers

By which of the following reactions can one get N-methyl aniline from aniline ?

asked Dec 19, 2018 by pady_1

1 answer

In Wurtz reaction the reagent used is :

asked Dec 19, 2018 by pady_1

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The homologue of ethyne is :

asked Dec 19, 2018 by pady_1

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Hydrolysis of trichloromethane with aqueous KOH gives :

asked Dec 19, 2018 by pady_1

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Carbogen is :

asked Dec 19, 2018 by pady_1

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Which of the following sets of elements does not belong to transitional element set ?

asked Dec 19, 2018 by pady_1

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Silver containing lead as an impurity is removed by :

asked Dec 19, 2018 by pady_1

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Acetic acid reacts with $PCl_5$ to form :

asked Dec 19, 2018 by pady_1

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Which one of the following reactions is an example of calcination process ?

asked Dec 19, 2018 by pady_1

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Which of the following is the strongest Lewis acid ?

asked Dec 19, 2018 by pady_1

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A mixture contains four solid organic compounds A, B, C, D. On heating only C changes from solid to vapours state. C can be separated from the rest in the mixture by :

asked Dec 19, 2018 by pady_1

1 answer

Cassiterite is concentrated by :

asked Dec 19, 2018 by pady_1

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The number of moles of $AgCl$ precipitated when excess $AgNO_3$ is added to one mole of $[Cr(NH_3)_4Cl_2]Cl$ is :

asked Dec 19, 2018 by pady_1

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The element which can displace three other halogens from their compounds is :

asked Dec 19, 2018 by pady_1

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Which one of the following reactions does not yield an alkyl halide ?

asked Dec 19, 2018 by pady_1

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Which one of the following reacts with concentrated sulphuric acid ?

asked Dec 19, 2018 by pady_1

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Mortar is a mixture of :

asked Dec 19, 2018 by pady_1

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A gas decolourises $Br_2$ in $CCl_4$ and forms a precipitate with ammonical silver nitrate. The gas is :

asked Dec 19, 2018 by pady_1

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The heat of combustion of $CH_4$ , $C$ (graphite) and $H_{2(g)}$ are respectively $20\;kcal$ , $40\; kcal$ and $-10\; kcal$ . The heat of formation of $CH_4$ is :

asked Dec 19, 2018 by pady_1

0 answers

Which of the following solutions cannot act as a buffer ?

asked Dec 19, 2018 by pady_1

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$75\%$ of first order reaction is completed in 32 minutes $50 \%$ of the reaction would have been completed in :

asked Dec 19, 2018 by pady_1

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4.5 moles each of hydrogen and iodin heated in a sealed 10 L vessel. At equilibrium 3 moles of HI were found. The equilibrium constant for $H_{2(g)} + I_{2(g)} \leftrightharpoons 2HI_{(g)}$ is :

asked Dec 19, 2018 by pady_1

0 answers

The cell reaction of a cell is $Mg_{(s)} + Cu^{2+}_{(aq)} \to Cu_{(s)} + Mg^{2+}_{(aq)}$ If the standard reduction potentials of magnesium and copper are $-0.33$ and $+2.38\; V$ respectively, the e.m.f of the cell is:

asked Dec 19, 2018 by pady_1

0 answers

The first emission line of hydrogen atomic spectrum in the Balmer series appears at (R = Rydberg constant) :

asked Dec 19, 2018 by pady_1

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An organic compound having carbon and hydrogen has $80\%$ carbon. The empirical formula of the hydrocarbon is :

asked Dec 19, 2018 by pady_1

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The effective atomic number of $Cr$ in $[Cr(NH_3)_6]Cl_3$ is :

asked Dec 19, 2018 by pady_1

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The conjugate base of $NH_2^-$ is :

asked Dec 19, 2018 by pady_1

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Hg sticks to the surface of the glass when it comes in contact with :

asked Dec 19, 2018 by pady_1

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$Be^{2+}$ is isoelectronic with :

asked Dec 19, 2018 by pady_1

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Reaction of benzene with alkyl halide in the presence of anhydrous $AlCl_3$ is called :

asked Dec 19, 2018 by pady_1

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Which one of the following can be used as an anaesthelic ?

asked Dec 19, 2018 by pady_1

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Silver chlorides dissolve in excess of $NH_4OH$ . The cation present in this solution is :

asked Dec 19, 2018 by pady_1

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Liquid benzene burns in oxygen according to $2C_6H_{6(l)} + 15O_{2(g)} \to 12CO_{2(g)} + 6H_2O_{(g)}$ How much litres of oxygen are required for complete combustion of $39\;g$ of liquid $C_6H_6$ ?

asked Dec 19, 2018 by pady_1

0 answers

The pH of a solution is increased from 3 to 6. Its $H^+$ ion concentration will be :

asked Dec 19, 2018 by pady_1

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How much litres of $CO_2$ at STP will be formed when $100 \;mL$ of $M \; H_2SO_4$ reacts with excess of $Na_2CO_3$ ?

asked Dec 19, 2018 by pady_1

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As per the modern periodic law the physical and chemical properties of elements are periodic functions of their :

asked Dec 19, 2018 by pady_1

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One mole of argon gas will have least density at :

asked Dec 19, 2018 by pady_1

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Which of the following species has the highest ionization potential ?

asked Dec 19, 2018 by pady_1

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The radius of the nucleus is related to the mass number A by :

asked Dec 19, 2018 by pady_1

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Which one of the following set of the quantum numbers is not possible for a 4p electron ?

asked Dec 19, 2018 by pady_1

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