List of top Chemistry Questions

The element that does not show catenation among the following $p$-block elements is

The electron affinity of chlorine is $3.7\, eV. \,1$ gram of chlorine is completely converted to $Cl^-$ ion in a gaseous state. $(1\, eV = 23.06\, kcal\, mol^{-1})$. Energy released in the process is

The electrode potential E$_{\left(\frac{Zn^{2+}}{Zn}\right)}$ of a zinc electrode at 25$^{\circ}$C with an aqueous solution of 0.1M $ZnSO_4$ is (E$^{\circ}$$_{\left(\frac{Zn^{2+}}{Zn}\right)}$ = -0.76 V. Assume $\frac{2.303RT}{F} =$ 0.06 at 298 K)

The dissociation constant of a substituted benzoic acid at $25^{\circ}C$ is $1.0 \times 10^{-4}$. The $pH$ of $0.01 \,M$ solution of its sodium salt is

The difference between the reaction enthalpy change $\left( \Delta_{r}H\right)$ and reaction internal energy change $\left( \Delta_{r}U\right)$ for die reaction : $2C_{6}H_{6} \left(1\right) +15O_{2} \left(g\right) \to 12CO_{2} \left(g\right) + 6H_{2}O\left(1\right)$ at $300$ K is $\left(R=8.31 \,,mol^{-1}K^{-1}\right)$

The density of a solution prepared by dissolving $120\, g$ of urea (mol. mass = $60\, u$) in $1000 \,g$ of water is $1.15\, g/mL$. The molarity of this solution is :

The d-electron configurations of $Cr^{2+},Mn^{2+},Fe^{2+}$ and $Co^{2+}$ are $d^4, d^5, d^6$ and $d^7$ respectively. Which one of the following will exhibit the lowest paramagnetic behaviour? (Atomic no. $Cr=24, Mn=25, Fe=26, Co=27$).

The correct statement for both the processes of physisorption and chemisorption is

The conversion of benzene diazonium chloride to bromobenzene can be accomplished by

The chlorination of methane is an example of

Synthetic polymer bakelite can be prepared from following compounds

Square-planar geometry is shown by

Shape and hybridisation of $SO_2$ are

Select the correct order in relation with the bond length

Purple of cassius is a/an

Protein part of a Holoenzyme is called

Predict the products in the given reaction,

Peptization is a process in which

Oxidation number of $Cr$ in $Cr_{2} O^{2-}_{7}$ is

Number of isomers of CH

N?? bond length is minimum in

Measuring Biochemical Oxygen Demand (BOD) is a method used for

Magnetic moment of $Cr^{2+}$ is nearest to

Lithium forms body centred cubic structure. The length of the side of its unit cell is $351\, pm$. Atomic radius of the lithium will be :

Iron exhibits +2 and + 3 oxidation states. Which of the following statements about iron is incorrect ?