List of top Questions asked in CPET- 2025

Conversion of acetophenone oxime to acetanilide is best accomplished by using:
Aniline absorbs at 280 nm. However, in an acidic solution, the main absorption band is seen at:
Sea water boils at a temperature:
What is the pH of the solution formed by mixing 40 mL of 0.1 M HCl with 10 mL of 0.45 N NaOH?
Among the following, the least polarised anion is:
During the standardisation of \(Na_2S_2O_3\) using \(K_2Cr_2O_7\) by the iodometric method, the equivalent weight of \(K_2Cr_2O_7\) is:
The Aufbau principle is not correctly obeyed in the ground state electronic configuration of the pair:
For the principal quantum number \(n = 5\), the maximum number of electrons that can occupy that shell is:
Which of the following carbohydrates gives an osazone with a different structure than the other three?
Which of the following elements does not form electron-deficient compounds?
When a transition between states of the same multiplicity occurs without emitting light, the process is called:
The unit of rate constant for a second-order reaction is:
The lattice parameters for a monoclinic crystal are:
When crystals of sodium chloride are heated in the presence of sodium vapour, they turn yellow. This is due to the formation of:
The percentage transmittance of a solution having an absorbance (optical density) of 1.0 is: (Given \(A = -\log_{10} T\))
The half-life times for a reaction at initial concentrations of 0.1 mol/L and 0.4 mol/L are 200 s and 50 s, respectively. The order of the reaction is:
What is the product of the reaction when diethyl amine (a secondary amine) reacts with NaNO2 and HCl?
The ionization energy of the hydrogen atom is 13.6 eV. What will be the ionization energy of He+ (Z=2, one-electron ion)?
Which one of the following atomic spectral transitions is forbidden (by the selection rule \(\Delta l = \pm 1\))?
If the principal quantum number of an atom is 3, then the angular (azimuthal) quantum number is:
The total number of rotational and vibrational degrees of freedom for propene (C3H6), a nonlinear molecule with 9 atoms, are, respectively:
Which among the four is not an antibiotic?
An extensive property of a thermodynamic system among the following is:
A perfect gas expands reversibly at a constant temperature of 298 K so that its volume doubles. What is the change in the molar internal energy of the gas?
What will be the \(m/z\) value of the base peak in the mass spectrum of n-butyl benzene \((PhCH_2CH_2CH_2CH_3)\)?