Chemistry

Which of the following is the energy of a possible excited state of hydrogen?

  1. - 6.8 eV
  2. - 3.4 eV
  3. + 6.8 eV
  4. + 13.6 eV

The ionic radii (in Å) of N3–, O2– and F are respectively

  1. 1.36, 1.71 and 1.40
  2. 1.71, 1.40 and 1.36
  3. 1.71, 1.36 and 1.40
  4. 1.36, 1.40 and 1.71

The color of KMnO4 is due to

  1. d – d transition
  2. L → M charge transfer transition
  3. σ – σ* transition
  4. M → L charge transfer transition

Which of the following compounds is not an antacid?

  1. Cimetidine
  2. Phenelzine 
  3. Ranitidine
  4. Aluminium hydroxide

In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

  1. Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity
  2. Al3+ is reduced at the cathode to form Al
  3. Na3AlF6 serves as the electrolyte
  4. CO and CO2 are produced in this process

Which polymer is used in the manufacture of paints and lacquers?

  1. Glyptal
  2. Polypropene
  3. Poly vinyl chloride
  4. Bakelite

In a compound C, H and N atoms are present in 9:1:3.5 by weight. Molecular weight of compound is 108. Molecular formula of compound is

  1. C9H12N3
  2. C3H4N
  3. C6H8N2
  4. C2H6N2

Number of atoms in 558.5 gram Fe (atomic weight of Fe = 55.85 g mol–1) is

  1. twice that in 60 g carbon
  2. half that in 8 g He
  3. 6.023 × 1022
  4. 558.5 × 6.023 × 1023

The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately (Planck's constant, h = 6.63 × 10–34 Js)

  1. 10–16 metres
  2. 10–31 metres
  3. 10–33 metres
  4. 10–25 metres

Which one of the following compounds has the smallest bond angle in its molecule?

  1. NH3
  2. SH2
  3. SO2
  4. OH2

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

  1. P/RT
  2. PT/R
  3. RT/P
  4. PRT

The enthalpy change for a reaction does not depend upon the

  1. use of different reactants for the same product.
  2. nature of intermediate reaction steps.
  3. physical states of reactants and products.
  4. difference in initial or final temperatures of involved substances.

Butene-­1 may be converted to butane by reaction with

  1. Zn-Hg
  2. Sn-HCl
  3. Zn-­HCl
  4. Pd/H2

On mixing a certain alkane with chlorine and irradiating it with ultraviolet light, it forms only one monochloroalkane. This alkane could be

  1. neopentane
  2. pentane
  3. propane
  4. isopentane

2-­Methylbutane on reacting with bromine in the presence of sunlight gives mainly

  1. 2-­bromo­-2-­methylbutane
  2. 1-­bromo-­3-­methylbutane
  3. 2-­bromo-­3-­methylbutane
  4. 1-­bromo-­2-­methylbutane

Presence of a nitro group in a benzene ring

  1. deactivates the ring towards nucleophilic substitution
  2. activates the ring towards electrophilic substitution
  3. renders the ring basic
  4. deactivates the ring towards electrophilic substitution

The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly

  1. benzoyl chloride
  2. m-­chlorobenzene
  3. benzyl chloride
  4. o­- and p­-chlorotoluene

Which of the following reactions will yield 2, 2-­dibromopropane?

  1. C2H2 + 2HBr →
  2. CH3CHCH2 + 2HBr →
  3. CH3CHCHBr + HBr →
  4. CH3CCH + 2HBr →

The hydrocarbon which can react with sodium in liquid ammonia is

  1. CH3CHCHCH3
  2. CH3CH2C≡CCH2CH3
  3. CH3CH2CH2C≡CCH2CH2CH3
  4. CH3CH2C≡CH

The alkene that exhibits geometrical isomerism is

  1. 2-methyl propene
  2. 2 methyl 2 butene
  3. 2-Butene
  4. propene

The IUPAC name of neopentane is

  1. 2 – methylpropane
  2. 2, 2 – dimethylpropane
  3. 2 – methylbutane
  4. 2, 2 – dimethylbutane

One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is

  1. 1-butene
  2. 2-butene
  3. propene
  4. ethene

Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of

  1. an acetylenic triple bond
  2. a vinyl group
  3. two ethylenic double bonds
  4. an isopropyl group

Alkyl halides react with dialkyl copper reagents to give

  1. alkenes
  2. alkenyl halides
  3. alkanes
  4. alkyl copper halides

During dehydration of alcohols to alkenes by heating with concentrated H2SO4 the initiation step is

  1. protonation of alcohol molecule
  2. formation of an ester
  3. formation of carbocation
  4. elimination of water

Among the following compounds which can be dehydrated very easily?

  1. CH3CH2CH2CH2CH2OH
  2. CH3CH2CH2CHOHCH3
  3. CH3CH2CHCH3CH2CH2OH
  4. CH3CH2CH3COHCH2CH3

Phenyl magnesium bromide reacts with methanol to give

  1. a mixture of benzene and Mg(OMe)Br
  2. a mixture of anisole and Mg(OH)Br
  3. a mixture of phenol and Mg(Me)Br
  4. a mixture of toluene and Mg(OH)Br

The IUPAC name of CH3COCH(CH3)2 is

  1. isopropylmethyl ketone
  2. 4-­methylisopropyl ketone
  3. 2-­methyl­-3-­butanone
  4. 3-­methyl-­2-­butanone

Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid?

  1. Butanol
  2. Phenol
  3. Benzaldehyde
  4. Benzoic acid

Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon?

  1. Acetic acid
  2. Butan­-2-­one
  3. Ethyl acetate
  4. Acetamide

When primary amine reacts with chloroform in ethanoic KOH then the product is

  1. an alcohol
  2. an isocyanide
  3. a cyanide
  4. an aldehyde

The correct order of increasing basic nature for the bases NH3, CH3NH2 and (CH3)2NH is

  1. CH3NH2 < (CH3)2NH < NH3
  2. CH3NH2 < NH3 < (CH3)2NH
  3. (CH3)2NH < NH3 < CH3NH2
  4. NH3 < CH3NH2 < (CH3)2NH

Which one of the following methods is neither meant for the synthesis nor for separation of amines?

  1. Wurtz reaction
  2. Curtius reaction
  3. Hinsberg method
  4. Hofmann method

Which one of the following is the strongest base in aqueous solution?

  1. Dimethylamine
  2. Aniline
  3. Trimethylamine
  4. Methylamine

Bakelite is obtained from phenol by reaction with

  1. CH3CHO
  2. HCHO
  3. CH3COCH3
  4. (CH2OH)2

The species which can best serve as an initiator for the cationic polymerization is

  1. AlCl3
  2. BuLi
  3. LiAlH4
  4. HNO3

RNA is different from DNA because RNA contains

  1. ribose sugar and uracil
  2. deoxyribose sugar and uracil
  3. ribose sugar and thymine
  4. deoxyribose sugar and thymine

The reason for double helical structure of DNA is operation of

  1. electrostatic attractions
  2. dipole-­dipole interaction
  3. van der Waal's forces
  4. hydrogen bonding

Complete hydrolysis of cellulose gives

  1. D-­fructose
  2. D-­glucose
  3. D­-ribose
  4. L-­glucose

Which base is present in RNA but not in DNA?

  1. Thymine
  2. Guanine
  3. Cytosine
  4. Uracil