List of top Chemistry Questions asked in KEAM

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

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

An organic compound \( \text{C}_5\text{H}_{10}\text{O} \) does not reduces Tollen's reagent but forms addition compound with sodium hydrogen sulphite and gives the Iodoform test. On vigorous oxidation, it gives ethanoic acid and propanoic acid.

Which transition metal has more than one metallic structure at normal temperature?

Which donot form carbylamine

Geometry of a molecule \( \text{AB}_3\text{E}_2 \) with 3 bond pairs and 2 lone pairs

IUPAC name of \( \text{(CH}_3\text{)}_3\text{C}-\text{CH}_2\text{Br} \)

Reagent used to convert decanol to decanoic acid

Which of the following is an electron donating group?

The average oxidation state of sulphur in the tetrathionate ion is:

Which of the following is a Lewis acid?