List of top Chemistry Questions

Which of the following sets of quantum numbers represents the highest energy of an atom?
A monoatomic anion of unit charge contains 45 neutrons and 36 electrons. Identify the ion.
For $d$-electron, the orbital angular momentum is
The decreasing order of basic character of $K_2O,\, BaO, \, CaO$ and $MgO$ is
The conversion of nitriles to aldehydes with stannous chloride in presence of $HCl$ is known as
The carbocation formed in $S_{N}1$ reaction of alkyl halide in the slow step is
Lucas reagent is equimolar solution of
For a reaction, $NO (g)+ O _{2}(g) \rightarrow 2 NO _{2}(g) ;$ Rate $=k l[N O]^{2}\left[O_{2}\right]$. If the volume of the reaction vessel is doubled, the rate of reaction
Two moles of an ideal gas are allowed to expand reversibly and isothermally at $300\, K$ from a pressure of $1\, atm$ to a pressure of $0.1\, atm$. The change in Gibbs free energy is
Reason of lanthanoid contraction is:
Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is
Reason of lanthanoid contraction is
In a face centered cubic lattice atoms $A$ are at the corner points and atoms $B$ at the face centered points. If atom $B$ is missing from one of the face centered points, the formula of the ionic compound is :
What happens when an inert gas is added to an equilibrium keeping volume unchanged ?
If $m$ and $e$ are the mass and charge of the revolving electron in the orbit of radius $r$ for hydrogen atom, the total energy of the revolving electron will be :
In S$_N$2 reactions, the correct order of reactivity for the following compounds $CH_3Cl,CH_3CH_2Cl, (CH_3 )_2CHCl$ and (CH$_3 )_3CCl$ is
For the reaction, 3A + 2B $\to$ C + D, the differential rate law can be written as :
The amount of $BaSO _{4}$ formed upon mixing $100 \,mL$ of $20.8 \% BaCl _{2}$ solution with $50 \,mL$ of $9.8 \% H _{2} SO _{4}$ solution will be : $( Ba =137, Cl =35.5, S =32, H =1$ and $O =16)$
In a monoclinic unit cell, the relation of sides and angles are respectively :

Graph between stopping potential of most energetic emitted photoelectrons (\(V_s\)) and frequency (\(\nu\)) of incident radiation on metal is given. Value of slope AB/BC in graph is [where \(h\) = Planck’s constant, \(e\) = electronic charge]: 

\(K_c\) for the reaction \([\text{Ag(CN)}_2]^-\rightleftharpoons \text{Ag}^+ + 2\text{CN}^-\) is \(4.0\times10^{-19}\) at \(25^\circ\text{C}\). The equilibrium concentration of silver cation in a solution which was originally \(0.1\) molar in KCN and \(0.03\) molar in AgNO\(_3\) is:
In the cell reaction \(\text{Cu(s)} + 2\text{Ag}^+(\text{aq}) \rightarrow \text{Cu}^{2+}(\text{aq}) + 2\text{Ag(s)}\), \(E^\circ_{\text{cell}} = 0.46\,\text{V}\). By doubling the concentration of \(\text{Cu}^{2+}\), \(E_{\text{cell}}\) is:
Cu\(^+\) is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction \(2\text{Cu}^+(\text{aq}) \rightarrow \text{Cu}^{2+}(\text{aq}) + \text{Cu(s)}\). Choose the correct \(E^\circ\) for the above reaction if \(E^\circ_{\text{Cu}^{2+}/\text{Cu}} = +0.34\,\text{V}\) and \(E^\circ_{\text{Cu}^+/\text{Cu}} = +0.15\,\text{V}\).
A gaseous reaction \(X_2(g) \rightarrow Y + \frac{1}{2}Z(g)\). There is an increase in pressure from 100 mm to 120 mm in 5 minutes. The rate of disappearance of \(X_2\) is:

\[ \text{Ph–CH(OH)–CHO} \xrightarrow[\text{H}_2\text{O}]{\text{HO}^-} Q \] P and Q are isomers. Identify Q.