List of top Chemistry Questions

According to Werner's theory, the primary valencies of the central metal atom :

Identify \(Base_2\) for the following equation according to Brønsted-Lowry theory:
\( HCl(aq) + H_2O(l) \rightleftharpoons H_3O^+(aq) + Cl^-(aq) \)

Lactose, the milk sugar is composed of

Hinsberg’s reagent is

Choose the correct decreasing order of basic strength of amines in aqueous solution:

Which of the following carboxylic acid has the highest $pK_a$ value?

The IUPAC name of mesityl oxide is

$p$-Bromophenol is the major product formed when phenol is treated with

Identify the allylic alcohol in the following.

Which of the following is an ambident nucleophile?

1-Chlorocyclohexene is an example of

The alkane that cannot be prepared in pure state by Kolbe’s electrolysis is

The number of C-C, C-H and C=C bonds in but-2-en-1-yne are, respectively

The complexes $[Co(NH_3)_6] [Cr(CN)_6]$ and $[Cr(NH_3)_6 ][Co(CN)_6]$ are examples of

Which of the following complex has the lowest molar conductivity?

Which of the following element of first transition series has the lowest atomization enthalpy?

The overall order of the following reaction is $KClO_3 + 6FeSO_4 + 3H_2SO_4 \rightarrow KCl + 3Fe_2(SO_4)_3 + 3H_2O$

In a first order reaction at a given temperature the time required to complete $99\%$ of the reaction ($T_1$) is related to time required for $90\%$ completion ($T_2$) as

If ‘$c$’ is the molarity of a solution, ‘$m$’ the molality, $M_2$ the molecular weight of the solute in a binary solution and ‘$\rho$’, is the density of the solution in $\text{g/cm}^3$, then the relationship between molality ‘$m$’ and molarity ‘$c$’ is given by}

In which one of the following reactions, $+2$ state in a reactant is reduced to $+1$ state?

For the gas phase homogenous equilibrium $N_{2(g)} + O_{2(g)} \rightleftharpoons 2NO_{(g)}$, $K_c = 0.1$ at $1500\text{ K}$. If the initial concentrations of $N_{2(g)}$ and $O_{2(g)}$ are each $0.04\text{ mol L}^{-1}$ what is the equilibrium concentration of $NO_{(g)}$?

The equilibrium constant $K_P$ of a homogenous equilibrium reaction is $1 \times 10^{-6}$ at $227^\circ C$. What is the value of $\Delta G^0$ of the reaction at the same temperature? ($R = 8.3\text{JK}^{-1}\text{mol}^{-1}$)}

The standard enthalpies of formation of $C_6H_6(l)$, $CO_2(g)$ and $H_2O(l)$ are respectively $+49\text{kJ mol}^{-1}$, $-394\text{kJ mol}^{-1}$ and $-286\text{kJ mol}^{-1}$ respectively. What is the value of standard enthalpy of combustion of $C_6H_6(l)$?

The enthalpy of vapourisation of diethyl ether is $26.0\text{ kJ mol}^{-1}$ and its normal boiling point is $35^\circ C$. What is the value of $\Delta S^0$ for the conversion of liquid diethyl ether to vapour at $35^\circ C$?