List of top Chemistry Questions asked in KEAM

The threshold wavelength of a metal is \(6000\ \text{\AA}\). The work function of the metal is (\(h = 6.62 \times 10^{-34}\ \text{J s}\))

The radius of the first orbit of \(\mathrm{He^+}\) is

In Mosley experiment, the X-ray spectrum is obtained by plotting

Which of the following elements have the highest and the lowest first ionization enthalpy?
(i) Be (ii) B (iii) C (iv) N (v) O

If the de Broglie wavelength associated with an electron is $0.1227$ nm, then its accelerating potential is

If a radiation of energy $5.2$ eV falls on the photosensitive surfaces of Mo and Ni, they emit photoelectrons with maximum kinetic energy of $0.5$ eV and $1$ eV, respectively. Then the work function of

If the de Broglie wavelengths of proton p and alpha particle \(\alpha\) are same, then

The angular momentum and the energy of the electron in the second Bohr’s orbit are respectively

Aniline reacts with acetic anhydride in pyridine to give a product which reacts with Br2 in CH3COOH to get

Which of the following amine has the highest boiling point?

When benzene diazonium chloride is treated with Cu and HBr, bromobenzene, N2 and CuCl are obtained. This reaction is called

When a mixture of CO and H2 is heated at 573 K-673 K under 200-300 atmospheric pressure in the presence of a catalyst, methanol is produced. The catalyst used is

Reimer-Tiemann reaction using CHCl3 and aq.NaOH involves the conversion of phenol into

Which of the following compound undergoes aldol condensation?

When benzoyl chloride is treated with \(H_2\) in the presence of \(Pd-BaSO_4\), benzaldehyde is formed. This reaction is called

The aldehyde that does not respond to Fehling’s test is

2-Methylpropene is obtained when sodium methoxide reacts with

CH3I cannot be prepared by direct iodination of methane as the reaction is slow and reversible. However, it can be prepared by carrying out the reaction in the presence of

Choose the Swarts reaction in the following:

An organic compound is heated with \(Na_2O_2\) then boiled with \(HNO_3\). The solution is then treated with ammonium molybdate. The yellow precipitate obtained is due to the presence of the element

Which of the following is a gas at 300K?

One mole of an alkene on ozonolysis gives two moles of propanone. What is the alkene?

The IUPAC name of the following alkane is \(CH_3-CH_2-CH(C_2H_5)-CH_2-CH(CH_3)-CH_2-CH_3\)

The calculated magnetic moment of two dipositive ions of 3d series element is 4.9 BM. The ions are

The first transition series metal that exhibits only +2, +3, +4 and +6 oxidation states is