List of top Chemistry Questions asked in KEAM

3 g of benzoic acid is added to 25 g of benzene. \( \Delta T_f = 2.5\,\text{K} \) and \( K_f \) of benzene is 5. What is the experimental molecular mass of benzoic acid?

In the reaction, \( \text{O}_{2(g)} + 4\text{H}^+_{(aq)} + 4\text{e}^- \rightarrow 2\text{H}_2\text{O}_{(l)} \), the quantity of electricity required to reduce one mole of gaseous oxygen is ( \( E^\circ = 1.23\,\text{V} \) )

A 250 watt bulb emits monochromatic light wavelength 198.78 nm. How many photons are emitted by the bulb per second?

The technique is used to purify liquid having very high b.p and decompose at or below this boiling point is

\( \Delta G \) for \( 3\text{X}_{(g)} + 2\text{Y}_{(g)} \rightarrow 3\text{Z}_{(g)} \) at 293 K is
( \( \Delta H^\circ = -13\,\text{kJ mol}^{-1} \), \( \Delta S^\circ = -45\,\text{J mol}^{-1}\text{K}^{-1} \) )

The major products formed by heating \( \text{C}_6\text{H}_5\text{CH}_2 - \text{O} - \text{C}_6\text{H}_5 \) with HI are

Total number of electrons present around the central atom in order of \( \text{PCl}_5 \), \( \text{SF}_6 \), \( \text{SCl}_2 \)

\( \text{CO}_2 \) is taken in a closed container initially at a pressure of 0.6 atm at 1500 K. After the addition of solid C, some of \( \text{CO}_2 \) is converted to CO. The equilibrium pressure is then 0.9 atm. Calculate the value of \( K_p \) at 1500 K.

The rate constant of a reaction at 400 K and 500 K are \( 0.04\,\text{min}^{-1} \) and \( 0.08\,\text{min}^{-1} \) respectively. The \( E_a \) of the reaction is about ( \( 2.303R = 19.15\,\text{J mol}^{-1}\text{K}^{-1} \) )

Which metal added in fuel cell to make it more efficient?

product of aldol condensation is 1,3-diphenyl pro-3-ene-1-one, then its reactants are

Find the order of magnitude of electrode potential ($E^\circ_{\text{M}^{2+}/\text{M}}$) of
Cr, V, Mn, Fe, Co

What are possible structural isomers of \( \text{C}_3\text{H}_6\text{Cl}_2 \)?

An organic compound (X) on reductive ozonolysis gave 1 mole of propanal-pent-3-one. Name the organic compound X.

Velocity of \( \text{I}^{\text{st}} \) orbit of hydrogen according to Bohr theory is \( v \), then what is the velocity of \( 3^{\text{rd}} \) orbit of hydrogen?

IUPAC name \( [\text{CoCl}_2(\text{en})_2]\text{Cl} \)

Find the mass of an organic compound of molar mass 84, required to prepare 250 ml solution of molarity 0.4

Find the order of metallic radius of
Mg, Li, Be, B, Al

Which among the following has least \( \text{p}K_b \) value?

Find difference in work function of two different metal if their stopping potential are 0.4V and 1.6V respectively.(metals are illuminated with photons of same energy)

A 250W bulb emit light of wavelength 19.6nm. Find the no of electron emitted per second

What is the ration of Debroglie wavemength of proton and neutron if kinetic energy is same for both

The correct increasing order of the acid strength of benzoic acid (I), 4-nitrobenzoic acid (II), 3,4-dinitrobenzoic acid (III) and 4-methoxybenzoic acid (IV) is