Which of the following is the energy of a possible excited state of hydrogen?
- - 6.8 eV
- - 3.4 eV
- + 6.8 eV
- + 13.6 eV
The ionic radii (in Å) of N3–, O2– and F– are respectively
- 1.36, 1.71 and 1.40
- 1.71, 1.40 and 1.36
- 1.71, 1.36 and 1.40
- 1.36, 1.40 and 1.71
Which of the following compounds is not an antacid?
- Aluminium hydroxide
In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?
- Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity
- Al3+ is reduced at the cathode to form Al
- Na3AlF6 serves as the electrolyte
- CO and CO2 are produced in this process
Which polymer is used in the manufacture of paints and lacquers?
- Poly vinyl chloride
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
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)
- 10–16 metres
- 10–31 metres
- 10–33 metres
- 10–25 metres
Which one of the following compounds has the smallest bond angle in its molecule?
For an ideal gas, number of moles per litre in terms of its pressure P, gas constant R and temperature T is
The enthalpy change for a reaction does not depend upon the
- use of different reactants for the same product.
- nature of intermediate reaction steps.
- physical states of reactants and products.
- difference in initial or final temperatures of involved substances.
Butene-1 may be converted to butane by reaction with
On mixing a certain alkane with chlorine and irradiating it with ultraviolet light, it forms only one monochloroalkane. This alkane could be
2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly
The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly
- benzoyl chloride
- benzyl chloride
- o- and p-chlorotoluene
Which of the following reactions will yield 2, 2-dibromopropane?
- C2H2 + 2HBr →
- CH3CHCH2 + 2HBr →
- CH3CHCHBr + HBr →
- CH3CCH + 2HBr →
The hydrocarbon which can react with sodium in liquid ammonia is
One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is
Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of
- an acetylenic triple bond
- a vinyl group
- two ethylenic double bonds
- an isopropyl group
Alkyl halides react with dialkyl copper reagents to give
- alkenyl halides
- alkyl copper halides
During dehydration of alcohols to alkenes by heating with concentrated H2SO4 the initiation step is
- protonation of alcohol molecule
- formation of an ester
- formation of carbocation
- elimination of water
Among the following compounds which can be dehydrated very easily?
Phenyl magnesium bromide reacts with methanol to give
- a mixture of benzene and Mg(OMe)Br
- a mixture of anisole and Mg(OH)Br
- a mixture of phenol and Mg(Me)Br
- a mixture of toluene and Mg(OH)Br
Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid?
- Benzoic acid
Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon?
- Acetic acid
- Ethyl acetate
When primary amine reacts with chloroform in ethanoic KOH then the product is
- an alcohol
- an isocyanide
- a cyanide
- an aldehyde
The correct order of increasing basic nature for the bases NH3, CH3NH2 and (CH3)2NH is
- CH3NH2 < (CH3)2NH < NH3
- CH3NH2 < NH3 < (CH3)2NH
- (CH3)2NH < NH3 < CH3NH2
- NH3 < CH3NH2 < (CH3)2NH
Which one of the following methods is neither meant for the synthesis nor for separation of amines?
- Wurtz reaction
- Curtius reaction
- Hinsberg method
- Hofmann method
Which one of the following is the strongest base in aqueous solution?
The species which can best serve as an initiator for the cationic polymerization is
The reason for double helical structure of DNA is operation of
- electrostatic attractions
- dipole-dipole interaction
- van der Waal's forces
- hydrogen bonding