The electrophile involved in the sulphonation of benzene is
The most reactive compound for electrophilic nitration will be
For principle quatum number n = 4, the total number of orbitals having l = 3 is
Acetylene reacts with ammonical silver nitrate to form
If NaOH is added to an aqueous solution of zinc ions a white precipitate appears and on adding excess of NaOH, the precipitate dissolves. In this solution, zinc exists in the
In its reaction with silver nitrate acetylene shows
The maximum number of electrons in p-orbital with n = 6 ; m = 0 is
For l = 3, the corresponding values of magnetic quantum numbers would be
Which of the following is an electrophile?
The bond order of a molecule is given by
Among the following compounds, which has a dipole moment greater than zero?
The heat of neutralisation, when 0.5 mole of HNO₃ solution is added to 0.2 moles of NaOH solution, is (Heat of neutralisation = 57 KJ-mol-1)
A gas bulb is filled with NO₂ gas and imersed in an ice bath at 0oC which becomes colourless after sometime. This colourless gas will be
The rate of reaction is doubled for every 10o rise in temperature. The increase in reaction rate as a result of temperature rise from 10o to 100o is
If 0.75 mole of an ideal gas is expanded isothermally at 27oC from 15 litres to 25 litres, then work done by the gas during this process is (R = 8.314J-K-1-mol-1)
The free energy change (∆Go) is negative when
Which of the following is the function of aspirin?
IUPAC name of CH₂ = CH-CN is
The general electronic configuration (n - 1)d3ns2 indicates that particular element belongs to
The given electronic configuration is correspond to d- block elements.
The d-electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?
(At No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)
The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium from bauxite by Hall process is (Atomic weight of AI = 27)
The substance not likely to contain CaCO₃ is
When the product of pressure and volume is plotted against pressure for a given amount of the gas, the line obtained is
Pressure cooker reduces cooking time because
What is the reaction occuring at the anode in Down's process for the extraction of sodium?
Purification of aluminium by electrolytic refining is known as
Glass reacts with HF to produce
A mixture of carbon monoxide, hydrogen and hydrocarbons is known as
PCl3 reacts with water to form
Number of atoms in one molecule of sulphur is
Which of the following is a pseudohalide?
Plaster of Paris hardens by
When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together?
Precipitation takes place when the ionic product
Why are strong acids genrally used as standard solutions in acid-base titrations ?
Optically active isomers but not mirror images are called
When rain is accompained by a thunderstorm, the collected rain water will have pH value
Which of the following has the maximum acidic strength?
The ages of most ancient formations are estimated by
Isobars are formed when emission of ..... takes place
A compound A has a molecular formula C₂Cl₃OH. It reduces Fehling solution and on oxidation give a monocarboxylic acid B. A is obtained by the action of chlorine on ethyl alcohol. A is
Dow's reaction involves
Conversion of ethyl alcohol into acetaldehyde is an example of
Acrolein is prepared from
In the following, electrophile is:
HO ― NO2
The addition of HBr to alkenes in the presence of peroxides is called :
Which of the following is odd one out?
Phenol on reduction with H₂ in presence of nickel catalyst gives
Teflon is a polymer, monomer of which is
Molecular mass of a volatile substance may be obtained by
In H₂O₂, the oxidation state of oxygen is
The oxidation state of nitrogen in N₃H is
Addition of arsenic to germanium makes the latter a
The solubility of a solid in a liquid depends upon
O₂,N₂ are present in the ratio of 1:4 by weight. The ratio of number of molecules is
Isomers whose molecular structures are non-superimposable mirror images of each other are called:
Which of the following is used for the destruction of colloids?
A 2.5 mol sample of hydrazine, N₂H₄ loses 25 mol of electrons in being converted to a new compound X. Assuming that all of the nitrogen appears in the new compound, what is the oxidation state of nitrogen in compound X ?
2.5 mol of N2H4 loses 25 mol electrons,
∴ 1 mole of N2H4 loses 10 mol electrons.
CuCl₂ and CuBr₂ exist as
During extraction of silver, which of the following is formed ?