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Recent questions and answers in 2013

Questions >> JEEMAIN and NEET >> NEET PAST PAPERS >> 2013

Which of the following compounds will not undergo Friedel-Craft reaction easily-

answered Feb 26, 2020 by meena.clay6

1 answer

The order of stability of the following tautomeric compounds is <br>

answered Feb 26, 2020 by meena.clay6

1 answer

answered Feb 26, 2020 by meena.clay6

1 answer

answered Feb 26, 2020 by meena.clay6

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Which is the monomer of Neoprene in the following ?

answered Feb 26, 2020 by meena.clay6

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Which of the following is a polar molecule ?

answered Feb 26, 2020 by meena.clay6

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$6.02 \times 10^{20}$ molecules of urea are present in $100\; mL$ of its solution. The concentration of solution is-

answered Feb 26, 2020 by meena.clay6

1 answer

Some meta - directing substitution in aromatic substitution are given. Which one is most deactivating ?

answered Feb 26, 2020 by meena.clay6

1 answer

Nitrobenzene on reaction with $conc. HNO_3/H_2SO_4$ at $80 – 100^ºC$ forms which one of the following products?

answered Feb 26, 2020 by meena.clay6

1 answer

The structure of isobutyl group in an organic compound is-

answered Feb 26, 2020 by meena.clay6

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Nylon is an example of-

answered Feb 26, 2020 by meena.clay6

1 answer

Among the following ethers, which one will produce methyl alcohol on treatment with hot concentrated HI ?

answered Feb 25, 2020 by meena.clay6

1 answer

Antiseptics and disinfectants either kill or prevent growth of microrganisms. Identify which of the following statements is not true-

answered Feb 25, 2020 by meena.clay6

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Which one of the following molecules contains no $\pi$ bond ?

answered Feb 25, 2020 by meena.clay6

1 answer

Which of the following statements about the interstitial compounds is incorrect ?

answered Feb 25, 2020 by meena.clay6

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Which of these is not a monomer for a high molecular mass silicone polymer ?

answered Feb 25, 2020 by meena.clay6

1 answer

Which of the following is electron-deficient ?

answered Feb 25, 2020 by meena.clay6

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$KMnO_4$ can be prepared from $K_2MnO_4$ as per the reaction : <br> $ 3MnO_4^{2-} + 2H_2O \rightleftharpoons 2MnO_4^- + MnO_2 + 4 OH^-$. <br> The reaction can go to completion by removing $OH^-$ ions by adding -

answered Feb 25, 2020 by meena.clay6

1 answer

Which of these is least likely to act as a Lewis base ?

answered Feb 25, 2020 by meena.clay6

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In excess of $AgNO_3$ is added to 100 mL of a 0.01 M solution of dichlorotetraaquachrominum (III) chloride. The number of moles of AgCl precipitated would be-

answered Feb 25, 2020 by meena.clay6

1 answer

$XeF_2$ is isostructural with-

answered Feb 24, 2020 by meena.clay6

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Identify the correct order of solubility in aqueous medium-

answered Feb 24, 2020 by meena.clay6

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Which of the following does not give oxygen on heating ?

answered Feb 24, 2020 by meena.clay6

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Reaction by which Benzaldehyde cannot be prepared-

answered Feb 24, 2020 by meena.clay6

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The basic structural unit of silicates is -

answered Feb 24, 2020 by meena.clay6

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Which of the following structure is similar to graphite ?

answered Feb 24, 2020 by meena.clay6

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Which of the following is paramagnetic ?

answered Feb 24, 2020 by meena.clay6

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Which is the strongest acid in the following ?

answered Feb 24, 2020 by meena.clay6

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Roasting of sulphides gives the gas X as a byproduct. This is colorless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is -

answered Feb 24, 2020 by meena.clay6

1 answer

A magnetic moment of 1.73 BM will be shown by one among the following -

answered Feb 24, 2020 by meena.clay6

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Dipole - induced dipole interactions are present in which of the following pairs :

answered Feb 24, 2020 by meena.clay6

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A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is $ 2.72 \; g \;cm^{–3}$. The molar mass of the metal is : <br> [NA Avogadro's constant = $6.02 \times 10^{23} mol^{–1}$]

answered Feb 24, 2020 by meena.clay6

1 answer

Maximum deviation from ideal gas is expected from :

answered Feb 24, 2020 by meena.clay6

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The number of carbon atoms per unit cell of diamond unit cell is -

answered Feb 24, 2020 by meena.clay6

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How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M $HNO_3$ ? The concentrated acid is 70 % $HNO_3$.

answered Feb 24, 2020 by meena.clay6

1 answer

A button cell used in watches functions as following <br> $Zn(s) + Ag_2O(s) + H_2O (l) \rightleftharpoons 2Ag(s) + Zn^{2+} (aq) + 2OH^- (aq)$ <br> If half cell potentials are <br> $Zn^{2+} (aq) + 2e^- \to Zn (s) ; \; \; \; E^o = -0.76V $ <br> $ Ag_2O(s) + H_2O (l) + 2e^- \to 2Ag(s) + 2OH^- (aq),\; \; \; E^o = 0.34 V $ <br> The cell potential will be -

answered Feb 24, 2020 by meena.clay6

1 answer

Based on equation $E = -2.178 \times 10^{-18} J (\frac{Z^2}{n^2})$, certain conclucsions are written. Which of them is not correct ?

answered Feb 21, 2020 by meena.clay6

1 answer

At $25^oC$ molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is $9.54 \; ohm^{-1} cm^2 mol^{-1}$ and at infinite dilution its molar conductance is $238 \; ohm^{-1} cm^2 mol^{-1}$. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is -

answered Feb 21, 2020 by meena.clay6

1 answer

A reaction having equal energies of activation for forward and reverse reactions has -

answered Feb 21, 2020 by meena.clay6

2 answers

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be ?

answered Feb 21, 2020 by meena.clay6

2 answers

What is the activation energy for a reaction if its rate doubles when the temperature is raised from $20^oC$ to $35^oC$ ? <br> (R = 8.314 $J mol^{-1} K^{-1}$)

answered Feb 21, 2020 by meena.clay6

2 answers

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers ? <br> n = 3, l = 1 and m = -1

answered Feb 21, 2020 by meena.clay6

2 answers

Structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is :

answered Feb 17, 2020 by sharmaaparna1

1 answer

According to Darwin, the organic evolution is due to -

answered Jan 16, 2020 by meena.clay6

1 answer

The eye of octopus and eye of cat show different patterns of structure, yet they perform similar function, This is an example of :

answered Jan 16, 2020 by meena.clay6

1 answer

Infection of Ascaris usually occurs by :

answered Jan 16, 2020 by meena.clay6

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The cell-mediated immunity inside the human body is carried out by :

answered Jan 16, 2020 by meena.clay6

3 answers

In plant breeding programmes, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called :

answered Jan 16, 2020 by meena.clay6

1 answer

During sewage treatment, biogases are produced which include :

answered Jan 16, 2020 by meena.clay6

1 answer

A biologist studied the population of rats in a barn, He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

answered Jan 16, 2020 by meena.clay6

1 answer

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