List of top Questions asked in KEAM- 2015

The hardest lanthanide element is

The enthalpy change for a reaction at equilibrium is $-20.5$ kJ mol$^{-1}$. Then the entropy change for this equilibrium at 410 K is}

The enthalpy of combustion of glucose (molecular weight = 180 g mol$^{-1}$) is $-2840$ kJ mol$^{-1}$. Then the amount of heat evolved when $0.9$ g of glucose is burnt, will be}

The relative strengths of trichlorides of boron group to accept a pair of electron is given by

Match the following

The hybridised state of bromine in bromine pentafluoride is

In the metallurgy of zinc, the reducing agent employed in reducing the zinc oxide to crude zinc metal in the last stage is

Which one of the following has the maximum number of P–OH bonds?

Aluminium (Atomic mass = 27) crystallizes in a cubic system with edge length of 4 \AA. Its density is 2.7 g cm$^{-3}$. The number of aluminium atoms present per unit cell is}

For two isomorphous crystals A and B, the ratio of density of A to that of B is 1.6 while the ratio of the edge length of B to that of A is 2. If the molar mass of crystal B is 200 g mol$^{-1}$, then molar mass of crystal A is}

A binary solid has a primitive cubical structure with B$^-$ ions constituting the lattice points and A$^+$ ions occupying 25% of its tetrahedral holes. The molecular formula of the crystal is

Which one of the following is reduced by H$_2$O$_2$ in alkaline medium?

Which of the following changes in the respective bond order values are caused by removal of an electron from N$_2$ and F$_2$ molecules?

The correct order of first ionisation enthalpies of the following elements is

The threshold frequency of a metal corresponds to the wavelength of \(x\) nm. In two separate experiments ‘A’ and ‘B’, incident radiations of wavelengths \(\frac{x}{2}\) nm and \(\frac{x}{4}\) nm respectively are used. The ratio of kinetic energy of the released electrons in experiment ‘B’ to that in experiment ‘A’ is

The minimum values of uncertainties involved in the determination of both the position and velocity of a particle are respectively \(1\times10^{-10}\,m\) and \(1\times10^{-10}\,ms^{-1}\). Then, the mass (in kg) of the particle is

The number of electrons with azimuthal quantum number \(l = 1\) and \(l = 2\) for Cr in ground state are respectively

An odd electron molecule among the following is

The power radiated by a linear antenna of length \(\ell\) at wavelength \(\lambda\) is

In a PNP transistor, \(10^{10}\) holes enter the emitter in \(10^{-6}\,s\). If 2% of holes is lost in the base, then the current amplification factor is

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 600 nm is incident on it. The energy band gap (in eV) for the semiconductor is

Identify the mismatched pair

Pick out the wrong statement

A ground receiver receives a signal at 5 MHz, transmitted by a ground transmitter at a height of 320 m, which is 110 km away from it. Then it can communicate through (radius of earth \(R = 6400\,km\))

A radioactive sample contains \(10^{-3}\,kg\) each of two nuclear species A and B with half-life 4 days and 8 days respectively. The ratio of the amounts of A and B after 16 days is