List of top Questions asked in KEAM

One mole of an alkene on ozonolysis gives a mixture of one mole pentan-3-one and one mole methanal. The alkene is (2024)

CH₃CH₂Br → (aq. KOH) → A → (PCl₅) → B
Final product B:

The correct sequence of bond enthalpy of ‘C–X’ bond is:

From the following pairs of ions which one is not an iso-electronic pair?

If the potential at A is zero, potential at B is

The work functions of two metals are 2.75 eV and 2 eV respectively. If these are irradiated by photons of energy 3 eV, the ratio of maximum momenta of the photoelectrons emitted respectively by them is

The magnetic flux (in weber) linked with a coil of resistance 10 Ω is varying with respect to time \( t \) as \( \phi = 4t^{2} + 2t + 1 \). Then the current in the coil at time \( t = 1 \) second is

A plane electromagnetic wave travels in free space along X-direction. If the value of B (in tesla) at a particular point in space and time is \( 1.2 \times 10^{-8} \hat{k} \). The value of E (in Vm⁻¹) at that point is

The de Broglie wavelength and kinetic energy of a particle is 2000 Å and 1 eV respectively. If its kinetic energy becomes 1 MeV, then its de Broglie wavelength is

The electromagnetic waves travel with

Enthalpy of combustion of benzene, graphite, dihydrogen are \( -3260 \), \( -390 \) and \( -290\text{ kJ/mol} \). Find the enthalpy of formation of benzene

Volume ofmethanol to make 2L of 0.4M solution
\( (\text{density} = 0.64\text{KgL}^{-1}, \text{ MM} = 32\text{ g mol}^{-1}) \)

Metals used in preparation of dihydrogen in lab

Which are carcinogenic hydrocarbon
(i) 1,2 - Benzanthracene
(ii) pent-1-yne
(iii) 1,2 - Benpyrene
(iv) cyclohexane
(v) 3-methyl cholanthrene

IUPAC name of
\( \text{CH}_3 - \text{CH}(\text{OH}) - \text{CH}_2 - \text{CH}(\text{OH}) - \text{CH}(\text{C}_2\text{H}_5) \)
\( | \)
\( \text{CH}_3 - \text{CH}_2 \)

In Chemotherapy, liqannd used to remove excess of Cu

Pyridinium chlorochromate is a complex of ...........

Which pais have ability to form \( \text{p}\pi - \text{p}\pi \) multiple bonds

\( \text{X}_2 + \text{O}_2 \rightleftharpoons 2\text{XO} \)
Concenttration of \( \text{X}_2 \) and \( \text{O}_2 \) are \( 4\times 10^{-3} \) and \( 3\times 10^{-3} \) respectively. Equilibrium concentration of XO (Kc = 0.5)

Find the emf of the reaction at 298K
\( \text{Ni}_{(s)} + 2\text{Ag}^+_{2\times 10^{-3}\text{M}} \rightarrow \text{Ni}^{+2}_{4\times 10^{-2}\text{M}} + 2\text{Ag}_{(s)} \)
\( (\text{E}^0_{\text{cell}} = 1.5 \text{ at } 298\text{K}) \)

Minimum energy required to remove an atom from sodium is \( 3.313 \times 10^{-19} \text{g.} \) Maximum wavelength of radiation that will get photoelectron

Spin only magnetic moement given not correct is

Mass of ethanoic acid required to prepare 0.5m solution containing 100g of water?

Conc. of H ions in HCl solution is \( 3\times 10^{-3}\text{M} \) then pH = -------?

Which are complex reaction
(i) Oxidation of ethane
(ii) Thermal decomposition of HI on gold surface
(iii) Saponification of methyl acetate
(iv) Nitration of phenol
(v) Decomposition of \( \text{NH}_3 \) on hot Pt surface