List of top Questions asked in KEAM

The rate and the rate constant of a reaction has the same units. The order of the reaction is
Which of the following molecule has a Lewis structure that does not obey the octet rule?
Strong intra-molecular hydrogen bond is present in:

The reaction:

\[ \text{H}_2\text{O}(g) + \text{Cl}_2\text{O}(g) \rightleftharpoons 2 \text{HOCl}(g) \]

is allowed to attain equilibrium at 400K. At equilibrium, the partial pressures are given as:

  • \( P_{\text{H}_2\text{O}} = 300 \) mm Hg
  • \( P_{\text{Cl}_2\text{O}} = 20 \) mm Hg
  • \( P_{\text{HOCl}} = 60 \) mm Hg

The value of \( K_p \) for the reaction at 400K is:

\[ K_p = \frac{P_{\text{HOCl}}^2}{P_{\text{H}_2\text{O}} \cdot P_{\text{Cl}_2\text{O}}} \]

Equal volumes of pH 3, 4, and 5 are mixed in a container. The concentration of \( {H}^+ \) in the mixture is (Assume there is no change in the volume during mixing):

ΔS would be negative for which of the following reactions? 
(I) \( {CaCO}_3(s) \rightarrow {CaO}(s) + {CO}_2(g) \) 
(II) \( {Ag}^+(aq) + {Cl}^-(aq) \rightarrow {AgCl}(s) \)
(III) \( {N}_2(g) + 3{H}_2(g) \rightarrow 2{NH}_3(g) \)
Choose the correct answer from the codes given below:

Which of the following molecule has the most polar bond?
The unit of an universal constant is cm\(^{-1}\). What is the constant?
The thickness of the depletion layer on either side of the p-n junction is of the order of
If the conductivity of the material lies in the range \(10^2 - 10^8 \, \Omega^{-1}m^{-1}\), then it is a
An external voltage \( V \) is supplied to a semiconductor diode having built-in potential \( V_0 \). The effective barrier height under forward bias is
If the initial decay rate of a radioactive sample is \( R_0 \), then the decay rate after a half-life time \( T_{1/2} \) is
In gamma emission, the nucleus emits
If the maximum number of neighbours of a nucleon within the range of nuclear force is \( p \) and \( k \) is a constant, then the binding energy per nucleon is approximately:
The energy required to excite the hydrogen atom from its first excited state to second excited state is:
The process by which the electrons can come out of the metal in a spark plug is:
A particle having mass 2000 times that of an electron travels with a velocity thrice that of the electron. The ratio of the de Broglie wavelength of the particle to that of the electron is
In a single slit diffraction experiment, the width of the slit and the wavelength of the light are respectively 5 mm and 500 nm. If the focal length of the lens is 20 cm, then the size of the central bright fringe will be
If the power of a lens is +4 D, then the lens is a
When two coherent sources each of individual intensity \( I_0 \) interfere, the resultant intensity due to constructive and destructive interference are respectively
The radiations used in LASIK eye surgery are:
If the total momentum delivered to a surface by an EM wave is \(3 \times 10^{-4}\) kg m/s, then the total energy transferred to this surface is:
The reactance of an induction coil of 4 H for a dc current (in \( \Omega \)) is:
When a current passing through a coil changes at a rate of 30 A s\(^{-1}\), the emf induced in the coil is 12 V. If the current passing through this coil changes at a rate of 20 A s\(^{-1}\), the emf induced in this coil is:
Which one of the following statement is INCORRECT?