List of top Chemistry Questions asked in KEAM

Finkelstein reaction is an example of

Solubility product $(K_{sp}) $ of saturated $PbCl_2$ in water is $1.8 \times 10^{-4} \, mol^3 \, dm^{-9}$. What is the concentration of $Pb^{2+}$ in the solution?

Facial and meridional isomerism will be exhibited by

The boiling point of methanol is greater than methyl thiol because

A dye that imparts different colours to the fabric with different metal ions is called

An invert sugar is

Aniline is treated with $NaNO_2 / HCl$ at $0^{\circ}C$ to give compound $X$ which on treatment with cuprous cyanide give another compound $Y$. When compound $Y$ is treated with $H_2/Ni$ compound $Z$ is obtained. Compound $Z$ is

For Balmer series in the spectrum of atomic hydrogen, the wave number of each line is given by $\bar\upsilon = R_H (\frac{1}{n_1^2} - \frac{1}{n_2^2})$ where $R_H$ is a constant and $n_1$and $n_2$ are integers. Which of the following statement(s) is (are) correct? 1. As wavelength decreases, the lines in the series converge 2. The integer $n_1$ is equal to $2$ 3. The ionisation energy of hydrogen can be calculated from the wave number of these lines 4. The line of longest wavelength corresponds to $n_2 = 3$

Aryl halides doesn't undergo nucleophilic substitution reactions under ordinary conditions because of 1. approach of nucleophile is retarded 2. carbon carrying halogen atoms is $sp^3$ - hybridised 3. the substrate molecule is destabilised due to resonance 4. partial double bond character between carbon and halogen

Reaction of butanone with methyl magnesium bromide following by hydrolysis gives

An important industrial solvent, also a laboratory reagent called 2-butanone is nothing but:

$Al_2(SO_4)_3$ is used in the following but not

Corundum is ................ mineral of aluminium.

The reaction of $H_2$ is given below $H_2 + CO + R - CH = CH_2 \to R - CH_2 - CH_2 - CHO$ is specifically called as

An insoluble dye is reduced to a soluble colourless leuco form by an alkaline reducing agent. The fibre is soaked in the dye solution and then exposed to air to develop the colour. The dye is

The $\alpha$- and $\beta$- forms of glucose are

Chlorination of benzene in the presence of halogen carrier is an example of

At $ 500 \,K $ , the half-life period of a gaseous reaction at an initial pressure of $ 80\, kPa $ is $ 350 \,s $ . When the pressure is $ 40 \,kPa $ , the half-life period is $ 175 \,s $ . The order of the reaction is

Air at sea level is dense. This is a practical implimentation of:

Identify the product/s in the following reaction. $ 3C{{H}_{3}}CH=C{{H}_{2}}\xrightarrow[{}]{B{{H}_{3}}}X\xrightarrow[{}]{{{H}_{2}}{{O}_{2}}/O{{H}^{-}}} $ $ product/s+{{H}_{3}}B{{O}_{3}} $

A compound ?A?with molecular formula CHO gives a positive 2, 4 DNP test but a negative Tollen?s test. On treatment with sodium hypochlorite, it gives CHCl and compound ?B?. Compound ?B? is

The boiling point of para nitrophenol is greater than ortho nitrophenol, because:

Sodium peroxide which is a yellow solid, when exposed to air becomes white due to the formation of

If the kinetic energy of the particle is increased to $16$ times its previous value, the percentage change in the de Broglie wavelength of the particle is

The partial pressure of oxygen in the alveolar air is: