List of top Questions asked in KEAM

When sodium nitroprusside is added to sodium fusion extract the presence of sulphur is indicated by the formation of a violet colored complex. Its formula is
When n-hexane is heated to 773K at 10-20 atmosphere pressure in the presence of \(Cr_2O_3\), benzene is formed. This reaction is called
In bringing a proton towards another proton, the electrostatic potential energy of the system
Octet rule is obeyed in
The energy stored in a soap bubble of diameter 4 cm is nearly (surface tension of soap solution is 0.07 N/m)
Which of the following molecules has two sigma ($\sigma$) and two pi ($\pi$) bonds?
The photoelectric work function for a photosensitive material is 5.2 eV. The energy of the incident radiation for which the stopping potential is 6 V is
A block of mass $M$ moves with a velocity $v$ along a frictionless horizontal surface towards another block of mass $2M$ at rest. The velocity of the center of mass of the system of blocks is
A parallel plate capacitor with a dielectric medium of dielectric constant 1.5 has a capacitance of \(C\). If the dielectric is removed, then the capacitance of the capacitor becomes
The average kinetic energy per molecule of an ideal gas at \(27^\circ C\) is \(E\). The temperature of the gas at which the average kinetic energy per molecule will be \(2E\) is
If $P$ is the pressure at which the heart is pumping the blood and the volume of blood pumped per second is $V$, then the power of the heart is given by
Two perfectly black bodies are at temperatures \( T \) and \( 2T \). The ratio between the wavelengths corresponding to maximum energy emission by the two black bodies is
A particle moves under the influence of a force in the XY-plane such that the components of its linear momentum $\vec{p}$ at any time $t$ are given by $p_x = p \sin t$ and $p_y = p \cos t$. The angle between $\vec{F}$ and $\vec{p}$ at that time is
The number of windings in the primary and secondary of a transformer are 100 and 2000 respectively. If 50 V a.c is applied to the primary, the potential difference across the secondary is

The values of X, Y, and Z in the following chemical equation are respectively: 
\( S_8 + X HNO_3 ({conc.}) \rightarrow Y H_2SO_4 + X NO_2 + Z H_2O \)

The correct order of arrangement of electromagnetic waves according to their wavelengths is
For a paramagnetic material, the magnetic susceptibility \( \chi_m \) is
Which of the following pairs of aquated first transition metal ions have the same color?
Which of the 3d block element has the minimum melting point?
When water is heated from $0^\circ$C to $8^\circ$C, its volume
If the nuclear radius of $^{125}_{52}\text{Te}$ is 6 fermi, then the nuclear radius of $^{27}_{13}\text{Al}$ in fermi is
Isobars are atoms with the same
The molar enthalpy of vaporization of water at 1 bar and $100^\circ$C is 41 kJ mol$^{-1}$. What is the internal energy change when 1 mol of water is vaporized at 1 bar pressure and $100^\circ$C? Assume water vapor as a perfect gas. (R = 8.3 J K$^{-1}$ mol$^{-1}$)
In the measurement of length 6 $\mu$m is equal to $x$ pm. Then the value of $x$ is

Which of the following changes alone would cause increase in the value of the equilibrium constant of the reaction? 
\(PCl_5(g) \rightarrow PCl_3(g) + Cl_2(g); \Delta H>0\)