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Recent questions tagged modelpaper

Celulose is the major componet of cell walls of :

asked Dec 18, 2013 by thanvigandhi_1

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Which one of the following is not a characteristic of phylum Annelida ?

asked Dec 18, 2013 by thanvigandhi_1

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Ascaris is characterized by :

asked Dec 18, 2013 by thanvigandhi_1

1 answer

Which one of the following in birds, indicates their reptilian ancestry ?

asked Dec 18, 2013 by thanvigandhi_1

1 answer

Which one of the following phyla is correctly matched with its two general characteristics ?

asked Dec 18, 2013 by thanvigandhi_1

1 answer

Which one of the following groups of three animals each is correctly matched with their one characteristics morphological feature ?

asked Dec 18, 2013 by thanvigandhi_1

1 answer

In which of the following male and female gametophytes do not have free living independent existence ?

asked Dec 18, 2013 by thanvigandhi_1

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Which one of the following is heterosporous ?

asked Dec 18, 2013 by thanvigandhi_1

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Thermococcus,methanococcus and methanobacterium exemplify :

asked Dec 18, 2013 by thanvigandhi_1

1 answer

Select one of the following pairs of important features distinguishing Gnetum from cycas and pinus and showing affinities with angiosperms :

asked Dec 18, 2013 by thanvigandhi_1

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Which one of the following is an amine hormone ?

asked Dec 18, 2013 by thanvigandhi_1

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Which one of the following statements is not true?

asked Dec 18, 2013 by thanvigandhi_1

1 answer

In a reaction of aniline a coloured product C was obtained

asked Dec 18, 2013 by thanvigandhi_1

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Acetophenone when reacted with a base, $ C_2H_5ONa,$ yields a stable compound which has the structure :

asked Dec 18, 2013 by thanvigandhi_1

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In a $S_N2$ substitution reaction of the type $ R-B+CI^- \underrightarrow {DMF} R-CI+Br^+,$ which one of the following has the highest reactivity rate :

asked Dec 18, 2013 by thanvigandhi_1

0 answers

An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67% . Th empirical formula of the compound would be :

asked Dec 18, 2013 by thanvigandhi_1

1 answer

Which one of the following is most reactive towards electrophilic attack?

asked Dec 18, 2013 by thanvigandhi_1

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In DNA, the complimentary bases are :

asked Dec 18, 2013 by thanvigandhi_1

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Base strength of :

asked Dec 17, 2013 by thanvigandhi_1

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The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of :

asked Dec 17, 2013 by thanvigandhi_1

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The stability of carbanions in the following :

asked Dec 17, 2013 by thanvigandhi_1

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How many stereoisomers does this molecule have ? $ CH_3CH=CHCH_2CHBrCH_3$

asked Dec 17, 2013 by thanvigandhi_1

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A strong base can abstract an $ \alpha$ - hydrogen from :

asked Dec 17, 2013 by thanvigandhi_1

1 answer

Green chemistry means such reactions which :

asked Dec 17, 2013 by thanvigandhi_1

0 answers

In the hydrocarbon

asked Dec 17, 2013 by thanvigandhi_1

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Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

asked Dec 17, 2013 by thanvigandhi_1

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Four diatomic species are listed below in different sequences. Which of these presents the correct order of their increasing bond order ?

asked Dec 17, 2013 by thanvigandhi_1

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The correct order of increasing bond angles in the following triatomic species is :

asked Dec 17, 2013 by thanvigandhi_1

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The angular shape of ozone molecule $(O_3)$ consist of :

asked Dec 17, 2013 by thanvigandhi_1

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In which of the following coordination entities the magnitude of $ \Delta\: o$ (C F S E in octahedral field ) will be maximum ?

asked Dec 17, 2013 by thanvigandhi_1

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With which one of the following elements silicon should be doped so as to give $p$ type of semiconductor?

asked Dec 17, 2013 by thanvigandhi_1

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Which one of the following arrangements does not give the correct picture of the trends indicated against it ?

asked Dec 17, 2013 by thanvigandhi_1

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The alkali metals from salt- like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders ?

asked Dec 17, 2013 by thanvigandhi_1

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On the basis of the following $E^{\circ}$ values, the strongest oxidizing agent is :$[Fe(CN_6)]^{4-} \rightarrow [Fe(CN_6)]^{3-} +e^{-1} ; E^{\circ}= -0.35V \: \: \:$ $ Fe^{2+} \rightarrow Fe^{3+} + e^{-1} ; E^{\circ} = -0.77 V$

asked Dec 17, 2013 by thanvigandhi_1

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Number of moles of $ MnO_4^-$ required to oxidise one mole of ferrous oxalate completely in acidic medium will be :

asked Dec 17, 2013 by thanvigandhi_1

0 answers

Volume occupied by one molecule of water ( density = 1 gm $cm^{-3}$ ) is :

asked Dec 17, 2013 by thanvigandhi_1

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Which of the following complexes exhibits the highest paramagnetic behaviour ?

asked Dec 17, 2013 by thanvigandhi_1

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How many moles of lead (II) chloride will be formed froma reaction between 6.5 g of PbO and 3.2 g of HCI ?

asked Dec 17, 2013 by thanvigandhi_1

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The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr(24) and Mn (25) is :

asked Dec 17, 2013 by thanvigandhi_1

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Percentage of free space in a body centred cubic unit cell is :

asked Dec 17, 2013 by thanvigandhi_1

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The sequence of ionic mobility in aqueous solution is :

asked Dec 17, 2013 by thanvigandhi_1

0 answers

The dissociation equilibrium of a gas $AB_2$ can be represented as :$2AB_2(g) \leftrightharpoons 2 \: AB (g) +B_2(g)$ The degree of dissociation is 'x' and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant $K_p$ and total pressure P is :

asked Dec 17, 2013 by thanvigandhi_1

0 answers

Standard free energies of formation ( in kJ / mol ) at 298 K are -237.2, -394.4 and -8.2 for $ H_2O(I) , CO_2(g) \: and \: pentane (g) $ respectively. The value of $ E^{\circ}_{cell}$ for the pentane oxygen fuel cell is :

asked Dec 17, 2013 by thanvigandhi_1

0 answers

The rate constant $k_1\: and \: k_2$ for two different reactions are $ 106{16}.e^{-2000/T}\: and \: 10^{15}.e^{-1000/T}$ , respectively. The temperature at which $ k_1 = k_2$ is :

asked Dec 16, 2013 by thanvigandhi_1

0 answers

For the gas phase reaction, $PCI_5(g) \leftrightharpoons PCI_3(g) +CI_2 (g)$ which of the following conditions are correct ?

asked Dec 16, 2013 by thanvigandhi_1

0 answers

If the concentration of $OH^-$ ions in the reaction $ Fe(OH)_3 (s) \leftrightharpoons Fe^{3+}(aq)+3\: OH^-(aq) $ is decreased by $ \large\frac{1}{4}$ times, then equilibrium concentration of $ Fe^{3+}$ will increase by :

asked Dec 16, 2013 by thanvigandhi_1

0 answers

$Kp_1\: and \: Kp_2$ for the reactions $ X \leftrightharpoons Y+Z.............(1) \: and \: A \leftrightharpoons 2B ............(2)$ are in the ratio of 9 : 1. If degree of dissociation of X and A be equal, then total pressure at equilibrium (1) and (2) are in the ratio :

asked Dec 16, 2013 by thanvigandhi_1

0 answers

Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the $H^+$ ion concentration in the mixture ?

asked Dec 16, 2013 by thanvigandhi_1

1 answer

Which of the following statements is not correct ?

asked Dec 16, 2013 by thanvigandhi_1

0 answers

Bond dissociation enthalpy of $H_2,CI_2\: and \: HCI$ are 434, 242 and 431 $kJmol^{-1}$ respectively. Enthalpy of formation of HCI is :

asked Dec 16, 2013 by thanvigandhi_1

0 answers

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