List of top Questions asked in KEAM- 2020

How many moles of platinum will be deposited on the cathode when 0.40 F of electricity is passed through a 1.0 M solution of \(Pt^{4+}\)?
\(CH_4(g)+4Cl_2(g)\rightarrow CCl_4(l)+4HCl(g)\). In the above reaction, the change of oxidation state of carbon is
When the same amount of the solute \(P\) and \(Q\) are separately dissolved in 500 g water, the \(\Delta T_f\) values are 0.15 K and 0.30 K respectively. If the molecular weight of \(P\) is 80 g mol\(^{-1}\), then the molecular weight of \(Q\) is
A solution is prepared by dissolving 20 g NaOH in 1250 mL of a solvent of density 0.8 g/mL. Then the molality of the solution is
The rate constant of a first order reaction is \(231\times10^{-5}\ s^{-1}\). How long will 4 g of this reactant reduce to 2 g?
The type of attractive forces that operate between gaseous HCl molecules is
The standard enthalpies of formation of \(H_2O(l)\) and \(CO_2(g)\) are respectively \(-286\ \text{kJ mol}^{-1}\) and \(-394\ \text{kJ mol}^{-1}\). If the standard heat of combustion of \(CH_4(g)\) is \(-891\ \text{kJ mol}^{-1}\), then the standard enthalpy of formation of \(CH_4(g)\) is
The pH of the resultant solution obtained by mixing 20 mL of 0.01 M HCl and 20 mL of 0.005 M \(Ca(OH)_2\) is
The equilibrium constant for the equilibrium \(PCl_5(g)\rightleftharpoons PCl_3(g)+Cl_2(g)\) at a particular temperature is \(2\times10^{-2}\ \text{mol dm}^{-3}\). The number of moles of \(PCl_5\) that must be taken in a one-litre flask at the same temperature to obtain a concentration of 0.20 mol of chlorine at equilibrium is
Schottky defect is shown by
In which one of the following reactions, entropy decreases?
Which one of the following molecules is formed by \(sp^3d^2\) hybridisation?
The correct match among the following is \[ \text{(a) Lithium, Sodium, Potassium} \qquad \text{(i) Alkaline earth metals} \] \[ \text{(b) Beryllium, Magnesium, Calcium} \qquad \text{(ii) Semi-metals} \] \[ \text{(c) Oxygen, Sulphur, Selenium} \qquad \text{(iii) Alkali metals} \] \[ \text{(d) Silicon, Germanium, Arsenic} \qquad \text{(iv) Chalcogens} \]
The IUPAC name of an element is Unnilbium. Its atomic number is
The number of electrons, protons and neutrons in a species are equal to \(10\), \(11\) and \(12\) respectively. The proper symbol of the species is
Which one of the following element is represented as Eka-Silicon in Mendeleev's periodic table?
The correct order of bond energy (in kJ/mol) of the following molecules is
Which one of the following will have the largest number of atoms?
The gates that give output \(Y=0\) for the two inputs \(A=1\) and \(B=1\) are
An organic compound contains \(24%\) carbon, \(4%\) hydrogen and remaining chlorine. Its empirical formula is
In amplitude modulation of audio frequency \(700\) Hz, the appropriate carrier frequency to be used is
The maximum line-of-sight distance \(d\) between the transmitting antenna of height \(h_t\) and receiving antenna of height \(h_r\) in LOS communication is \((R=\) radius of the earth\()\)
The shortest wavelength of Paschen series in hydrogen spectrum is \(1882\) \AA. The first member of the Paschen series is nearly
In a common emitter amplifier, the input resistance and output resistance are \(200\ \Omega\) and \(50\ \text{k}\Omega\) respectively. If the voltage gain of the amplifier is \(50\), then the power gain is
If the Ge diode in the circuit is reverse biased, the current through \(2\ \text{k}\Omega\) resistor