List of top Chemistry Questions asked in KEAM

The correct increasing order of the ionic radii of the isoelectronic species \(O^{2-}, N^{3-}, F^{-}, Mg^{2+}, Na^{+}\) and \(Al^{3+}\) is}

The IUPAC symbol of the element with atomic number 110 is}

Which of the following d-orbital does not have four lobes?}

The percentage composition of carbon in methane is}

Which of the following statement is incorrect?}

The set of elements which has exceptional electronic configurations not obeying Aufbau principle is}

Which of the following is NOT correctly matched for the compound and use mentioned below?

Match the following reactions with the corresponding reagents} Reactions \hspace{3cm} Reagents} (a) Oxidation of secondary alcohols to ketones \hspace{0.3cm} (i) $85%\,H_3PO_4,\ 440K$} (b) Dehydration of secondary alcohols to alkenes \hspace{0.1cm} (ii) $Na_2Cr_2O_7/H_2SO_4$} (c) Reduction of ketones to secondary alcohols \hspace{0.5cm} (iii) Chromic anhydride} (d) Oxidation of phenol to benzoquinone \hspace{0.2cm} (iv) $NaBH_4$

The linkage formed between 5' and 3' carbon atoms of the pentose sugar in nucleotides is

An aromatic compound A on treatment with ethanolic NaCN forms compound B which on reduction with $H_2/Ni$ gives a compound C of molecular formula $C_8H_{11}N$. The compounds A, B and C are

Which of the following amine has lowest $pK_b$ value in aqueous phase?

In aldol condensation reaction, 1,3-diphenylprop-2-en-1-one is obtained as major product in the reaction between

The major products formed by heating $C_6H_5CH_2-O-C_6H_5$ with HI are

Match the following:} Compound \hspace{2cm} Use} (a) Methylene chloride \hspace{0.8cm} (i) Solvent for iodine} (b) Chloroform \hspace{1.8cm} (ii) Manufacture of propellents} (c) Iodoform \hspace{2cm} (iii) Metal cleaning} (d) Carbon tetrachloride \hspace{0.6cm} (iv) Antiseptic

The technique used to purify liquids having very high boiling points and decompose at or below their boiling point is

The order of field strength of the following ligands in the spectrochemical series is

One mole of an alkene on ozonolysis gives one mole of propanal and one mole of pent-3-one. The alkene is

The number of possible structural isomers of $C_3H_6Cl_2$ are

Which of the following metal is incorporated into the electrodes of fuel cell to increase the rate of reaction?

A reaction is third order with respect to a reactant. If the concentration of the reactant is doubled, the rate of reaction increased by

The rate constant of a reaction at $400$ K and $500$ K are $0.04$ min$^{-1}$ and $0.08$ min$^{-1}$ respectively. The activation energy of the reaction is about \ ($2.303R=19$ J K$^{-1}$ mol$^{-1}$, $\log 2 = 0.3010$)

$3$ g of benzoic acid dissolved in $25$ g of benzene shows a depression in freezing point equal to $2.5$ K. What is the experimental molar mass of benzoic acid in benzene? \ (Molal depression constant for benzene is $5$ K kg mol$^{-1}$)

IUPAC name of $[CoCl_2(en)_2]Cl$ is

The correct order of standard electrode potentials of the following transition elements is

For the equilibrium, $2A(g)\rightleftharpoons 2B(g)+C(g)$, the value of the equilibrium constant $K_p$ is $0.1662$ atm at $1000$ K. The value of $K_c$ for the equilibrium at the same temperature is $(R=0.0831$ L atm mol$^{-1}$ K$^{-1})$