List of top Chemistry Questions asked in KEAM

Benzene diazonium chloride on treatment with HCl in the presence of copper powder gives chlorobenzene. This reaction is termed as
The descending order of basic strength of the following amines is
(i) N-Methylbenzenamine (ii) N,N'-Dimethylbenzenamine (iii) Benzenamine (iv) Phenylmethanamine
Vigorous oxidation of n-propylbenzene with alkaline potassium permanganate ($\mathrm{KMnO_4/KOH/\Delta}$) followed by hydrolysis gives
When 2-methylbutan-2-ol is treated with Lucas reagent (conc. HCl and $\mathrm{ZnCl_2}$) at room temperature, the product obtained is
Which of the following is a commercial method of manufacture of benzaldehyde?
The relative ease of dehydration of the following alcohols is
(i) Propan-2-ol (ii) Propan-1-ol (iii) 2-Methylpropan-2-ol
The formula of pentaamminecarbonatocobalt(III) chloride is
The reaction \(\mathrm{CH_3Br + AgF \rightarrow CH_3F + AgBr}\) is termed as
When sodium fusion extract is treated with sodium nitroprusside, the appearance of violet colour is due to the formation of
Which of the following gives 2-methylbutane on hydrogenation?
(i) 2-methylbut-1-ene (ii) 3-methylbut-1-yne (iii) 2-methylbut-2-ene
(iv) 3-methylbut-1-ene (v) pent-2-ene
An alkene, \(\mathrm{C_3H_6}\) (X), on treatment with HBr in presence of peroxide gives (Y). The compound (Y) on treatment with \(\mathrm{AgNO_2}\) in ethanol gives (Z). The compounds (X), (Y) and (Z) are respectively
The correct increasing order of wavelength of absorption of the following complexes is
(i) \([\mathrm{CoCl(NH_3)_5}]^{2+}\) (ii) \([\mathrm{Co(NH_3)_5(H_2O)}]^{3+}\) (iii) \([\mathrm{Co(NH_3)_6}]^{3+}\) (iv) \([\mathrm{Co(CN)_6}]^{3-}\)
A first order reaction follows the equation \(k = (4 \times 10^{10}\ \text{s}^{-1}) e^{-2000/T}\). The value of \(E_a\) for the reaction is about (\(R = 8.314\ \text{J K}^{-1}\text{ mol}^{-1}\))
In a pseudo first order reaction, the following results were obtained. {|c|c|c|c|c|c|c|c|} Time s & 0 & 10 & 20 & 30 & 40 & 50 & 60
$[A]$/mol lit$^{-1}$ & 0.65 & 0.55 & 0.46 & 0.38 & 0.26 & 0.20 & 0.13
Average rate of the reaction between 20 and 40 seconds is
The percentage of helium present in air used by scuba divers is
The molar conductivity of a weak monobasic acid, HA at 298 K is \(70\ \text{S cm}^2\text{ mol}^{-1}\). What is the percentage ionisation of HA at 298 K?
At infinite dilution \(\lambda^\circ_{H^+} = 340\ \text{S cm}^2\text{ mol}^{-1}\) and \(\lambda^\circ_{A^-} = 80\ \text{S cm}^2\text{ mol}^{-1}\)
Which of the following compound of manganese is a mixed oxide?
The correct increasing order of enthalpy of fusion \(\Delta_{\text{fus}}H^\circ\) (in kJ mol\(^{-1}\)) of the following compounds is
The $\Delta_r G^\circ$ of the galvanic cell in which the following cell reaction takes place, \[ 2\mathrm{Cr(s)} + 3\mathrm{Cd^{2+}(aq)} \rightarrow 2\mathrm{Cr^{3+}(aq)} + 3\mathrm{Cd(s)} \] is ($E^\circ_{\mathrm{Cr^{3+}/Cr}} = -0.74$ V and $E^\circ_{\mathrm{Cd^{2+}/Cd}} = -0.40$ V)
Which of the following bond has highest mean bond enthalpy?
The number of bonding pairs and lone pairs of electrons in \(\mathrm{BrF_5}\) molecule are respectively
Match the correct pH value with the following substances:
(a) Milk of magnesia (i) pH = 6.8
(b) Black coffee (ii) pH = 7.8
(c) Egg white (iii) pH = 5
(d) Milk (iv) pH = 10
The solubility product, \(K_{sp}\) of a sparingly soluble salt, \(\mathrm{AX_2}\), is \(3.2 \times 10^{-14}\) mol\(^3\) lit\(^{-3}\). Its solubility is
In Mosley experiment, the X-ray spectrum is obtained by plotting
The empirical formula of a metal oxide which has $54\%$ metal (M) and $46\%$ oxygen (O) is (Atomic mass of M = $27$ amu and O = $16$ amu)