List of top Chemistry Questions asked in KEAM

Consider the electrochemical reaction between $Ag(s)$ and $Cl_2(g)$ electrodes in 1 litre of $0.1\,M\,KCl$ aqueous solution. Solubility product of $AgCl$ is $1.8\times10^{-10}$ and $F=96500\,\text{C mol}^{-1}$. At $1\,\mu A$ current, calculate the time required to start observing the $AgCl$ precipitation in the galvanic cell

Consider the galvanic cell, $Pt(s)|H_2(1\,\text{bar})|HCl(aq)(1\,M)|Cl_2(1\,\text{bar})|Pt(s)$. After running the cell for sometime, the concentration of the electrolyte is automatically raised to $3\,M\,HCl$. Molar conductivity of the $3\,M\,HCl$ is about $240\,\text{S cm}^2\text{ mol}^{-1}$ and limiting molar conductivity of $HCl$ is about $420\,\text{S cm}^2\text{ mol}^{-1}$. If $K_b$ of water is $0.52\,\text{K kg mol}^{-1}$, calculate the boiling point of the electrolyte at the end of the experiment

The voltage of the cell consisting of $Li(s)$ and $F_2(g)$ electrodes is $5.92\,V$ at standard condition at $298\,K$. What is the voltage if the electrolyte consists of $2\,M\,LiF$? ($\ln 2=0.693, R=8.314\,\text{J K}^{-1}\text{mol}^{-1}$ and $F=96500\,\text{C mol}^{-1}$)

The data given below are for the reaction of $A$ and $D_2$ to form product at $295\,K$. Find the correct rate expression for this reaction. $\begin{array}{lll} D_2/\text{mol L}^{-1} & A/\text{mol L}^{-1} & \text{Initial rate}/\text{mol L}^{-1}\text{s}^{-1} \\ 0.05 & 0.05 & 1\times10^{-3} \\ 0.15 & 0.05 & 3\times10^{-3} \\ 0.05 & 0.15 & 9\times10^{-3} \end{array}$

Find the unit of the rate constant of a reaction represented with a rate equation, $\text{rate}=k[A]^{1/2}[B]^{3/2}$

Under what condition the order of the reaction, $2\text{HI}\xrightarrow{\Delta,\text{catalyst}}\text{H}_2(g)+\text{I}_2(g)$, is zero

If 1 mole of NaCl solute is dissolved into 1 kg of water, at what temperature will water boil at 1.013 bar? ($K_b$ of water is $0.52\,\text{K kg mol}^{-1}$)

Calculate the molarity of a solution containing 5 g of NaOH dissolved in the product of a $H_2-O_2$ fuel cell operated at 1 A current for 595.1 hours. (Assume $1\text{F}=96500\,\text{C mol}^{-1}$ of electrons and molecular weight of NaOH as $40\,\text{g mol}^{-1}$)

One mole of ethanol is produced reacting graphite, $H_2$ and $O_2$ together. The standard enthalpy of formation is $-277.7\,\text{kJ mol}^{-1}$. Calculate the standard enthalpy of the reaction when 4 moles of graphite is involved

Which of the following can help predict the rate of a reaction if the standard Gibbs free energy of reaction (\( \Delta_r G^\circ \)) is known?

Consider the equilibrium $X_2+Y_2\rightleftharpoons ?P$. Find the stoichiometric coefficient of $P$ using the data given in the following table.

Which of the following process best describes atomization of \(CH_4(g)\)?

The nitrosation of N,N-dimethylaniline takes place through the attack of electrophile

1 mole of $FeSO_4$ (atomic weight of Fe is $55.84\,\text{g mol}^{-1}$) is oxidized to $Fe_2(SO_4)_3$. Calculate the equivalent weight of ferrous ion

Mass % of carbon in ethanol is

Barbiturates are potent

Green fuel is the fuel obtained from

Neopentyl bromide undergoes dehydrohalogenation to give alkenes even though it has no \(\beta\)-hydrogen. This is due to

The compound that does not undergo haloform reaction is

The weakest among the following acids is

Oxidation of 1\(^\circ\) alcohols to aldehydes is very successful for the alcohols like

The halogen compound which will not react with phenol to give ethers is

The compound which does not lead to nitrile by substitution with NaCN/DMSO is

Which of the following compounds are aromatic?

Aromatic electrophilic substitution reaction that is reversible is