If R is the Rydberg constant for hydrogen, then wave-number of the second line in the Lyman series is
Wave no = 1/λ =R[1/n12 -1/n22]=R[1/12 -1/22]=3R/4.(For Lyman series n1=1)
The ratio of specific charge of a proton and an α-particle is
which of the following hybridisation occurs in the formation of methane molecule?
Which of the following has highest molar conductivity?
An aqueous solution of CoCl₂ on addition of excess of concentrated HCl, turns blue due to the formation of
Which of the following exhibit geometrical isomerism?
A liquid was mixed with ethanol and a drop of concentrated H2SO4 was added. A compound with a fruity smell was formed. The liquid was
Cuprous ore among the following is
Cuprite (Cu2O) is the cuprous ore whereas all other ores contain copper as cupric (Cu2+)
Electrolysis of dilute aqueous NaCl solution was carried out by passing 10 milliampere current. The time required to liberate 0.01 mol of H2 gas at the cathode is (1 Faraday = 96500 C mol-1)
For a first order reaction A → P, the temperature (T) dependent rate constant (k) was found to follow the equation log k = − (2000) 1/T + 6.0 . The pre-exponential factor A and the activation energy Ea, respectively, are
Extraction of zinc from zinc blende is achieved by
Among the following metal carbonyls, the C ― O bond order is lowest in
• Mn+ = 3d54s1 in presence of CO effective configuration = 3d64s0.
Three lone pair for back bonding with vacant orbital of C in CO.
• Fe0 = 3d64s2 in presence of CO effective configuration = 3d8 four lone pair for back bonding with CO.
• Cr0 = 3d54s1
Effective configuration = 3d6. Three lone pair for back bonding with CO.
• V− = 3d44s2 effective configuration = 3d6three lone pair for back bonding with CO. Maximum back bonding is present in Fe(CO)5there for CO bond order is lowest here.
The correct acidity order of the following is
Among the following, the surfactant that will from micelles in aqueous solution at the lowest molar concentration at ambient conditions is