List of top Chemistry Questions asked in KEAM

IUPAC official name for the element shows atomic number 110?

For a reaction \(\text{N}_2 + \text{O}_2 \rightleftharpoons 2\text{NO}\) . Given that \([\text{N}_2] = 2 \times 10^{-3}\), \([\text{O}_2] = 3 \times 10^{-3}\), \([\text{NO}] = 6 \times 10^{-6}\) Find the value of \(\text{K}_{\text{c}}\) for the reaction

Which of the following orbitals donot have 4 lobes?

Which among the following elements shows same atomic radius?

Find the % of composition of carbon in methane:

Which of the following has Van't Hoff factor (i) 1.82? (m = 0.01)

Which of the following yields Tarry product during oxidation:

Find the bond length of O \(-\) H in methanol

Which of the following lanthanoid ion is cloured?

Match the following

Oxidation state of oxygen in \(\text{H}_2\text{O}_2\)

Formula of Hinsberg reagent?

Which among the following is most basic in aqueous medium

Arrange the isoelectronic species in increasing order of ionic radius:
\(\text{Al}^{3+}\), \(\text{Na}^{+}\), \(\text{F}^{-}\), \(\text{O}^{2-}\)

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?

If the reaction is \( 3^{\text{rd}} \) order, if the concentration of reactant is doubled, then the rate is

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.