List of top Chemistry Questions asked in KEAM

The geometry of a molecule of type $AB_3E_2$ with 3 bonding pairs and 2 lone pairs is

Which of the following statements are correct about the $PCl_5$ molecule? (i) It has trigonal bipyramidal geometry.
(ii) It has three equatorial and two axial bonds.
(iii) The equatorial bond pairs suffer more repulsive interaction from the axial bond pair.
(iv) The equatorial bonds are slightly weaker than axial bonds.
(v) The hybridization involved in the molecule is $sp^3d$.

Which of the following pair of elements have greater ability to form $p\pi - p\pi$ multiple bonds?

The minimum energy required to remove an electron from sodium atom is $3.313 \times 10^{-19}J$. What is the maximum wavelength of radiation that will eject photoelectron from sodium metal? ($h = 6.626 \times 10^{-34}Js$)

Which of the following statements are correct about the postulates of quantum mechanical model of an atom? (i) The energy of electron in atom is quantized.
(ii) The existence of quantized electronic energy level is a result of the particle property of electrons.
(iii) The path of the electron can be determined accurately.
(iv) In a multi electron atom, the electrons are filled in various orbitals in the order of increasing energy.
(v) The probability of finding an electron at a point within an atom is proportional to the square of the orbital wave function.

What is the volume of methanol needed for making $2\,L$ of $0.4\,M$ solution? (Density of methanol $= 0.64\,kg\,L^{-1}$ and molar mass $= 32\,g\,mol^{-1}$)

If the threshold wavelengths of two metals are in the ratio $1:3$, then the work functions of these metals are in the ratio

The vitamin present in vegetable oils and its deficiency causes muscular weakness is

Find the order of field strength
\( \text{CN}^- \), \( \text{SCN}^- \), \( \text{NCS}^- \), \( \text{S}^{2-} \), \( \text{OH}^- \)

Which one of the following conditions will favour maximum formation of the product in the reaction, \( A_{2}(g) + B_{2}(g) \rightleftharpoons X_{2}(g) \), \( \Delta_r H = -x \,\text{kJ} \):

Among the following species, identify the pair having same bond order \( CN^{-} \), \( O_{2}^{-} \), \( NO^{+} \), \( CN^{+} \):

A neutral molecule \(XF_{3}\) has a zero dipole moment. The element X is most likely:

Which one of the following is not an allylic halide?

Oxidation number of potassium in \( K_{2}O \), \( K_{2}O_{2} \) and \( KO_{2} \), respectively, is:

An example of electrophilic substitution reaction is :

Which has minimum bond angle?

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

IUPAC name of the compound \([\text{Co}(\text{NH}_3)_5\text{ONO}]\text{Cl}_2\) is

Find A, B, C

For chemical reaction M \(\rightarrow\) N, the rate becomes 8 times when the concentration of M doubles, find the order of reaction with respect to M?

Which is incorrect regarding Bohr model?

1-phenyl-2-chlorobutane on reaction with EtOH/EtOK produces a product which on treatment with HBr produces

When sodium fusion extract of a compound is boiled with Iron (II)sulphate and then acidified with conc.sulphuric acid blood red colour is produced. The compound is ——?

For a \(\text{I}^{\text{st}}\) order reaction, 99% complete in 20 minutes, then the \(\text{t}_{1/2}\) will be : (log2 = 0.3)

Which of the following orbitals donot have 4 lobes?