List of top Chemistry Questions

The $C-H$ bond distance is the longest in

Formula of microcosmic salt is

Formation of alcohol by oxymercuration- demercuration of alkenes

Calculate the wavelength (in nanometer) associated with a proton moving at $1.0 \times 10^3ms^{-1}$ (Mass of proton $= 1.67 \times 10^{-27}\, kg$ and $h = 6.63 \times 10^{-34}\, Js$ ) :

The $S-S-S$ bond angle in $S_8$ molecule is $105^{\circ}$. $S_8$ has a V-shape.

Millon?? test is a test for identification of proteins. Millon?? reagent is a solution of mercurous nitrate and mercuric nitrate in nitric acid containing little nitrous acid.

Bleaching powder is a mixed salt. In the presence of $COCl _{2}$, bleaching powder decomposes to give $CaCl _{2}$ and $O _{2}$.

Among the alkali metals, lithium salts exhibit the least electrical conductance in aqueous solutions. Smaller the radius of the hydrated cation, lower is the electrical conductance in aqueous solutions.

A compound with delocalised electrons is more stable than that compound would be if all its electrons were localised. The extra stability, a compound gains as a result of having delocalised electrons, is called delocalisation energy.

$1.575\, g\, H _{2} C _{2} O _{4} \cdot 2 H _{2} O$ in $250 \,mL$ solution makes it $0.1 \,N$. $H _{2} C _{2} O _{4} \cdot 2 H _{2} O$ is a dihydrate organic acid.

Which one of the following impurities present in colloidal solution cannot be remove by electrodialysis?

When sucrose is heated with conc. $ HNO_{3},$ the product formed is

When propionic acid is treated with aqueous sodium bicarbonate, $ CO_{2}$ is liberated. The $C$ of $ CO_{2}$ comes from

Lithium metal crystallizes in a body centred cubic crystal. If the length of the side of the unit cell of lithium is $351\, pm,$ the atomic radius of the lithium will be

Oxidation number of $S$ in $ H_{2}S_{2}O_{8}$ is

For the redox reaction, $Zn + NO _{3}^{-} \longrightarrow Zn ^{2+}+ NH _{4}^{+}$ in basic medium, coefficients of $Zn , NO _{3}^{-}$, and $OH ^{-}$in the balanced equation respectively, are

How many bonds does $B_{2}$ have?

How many coulombs of electricity are required for reduction of $1$ mole of $ MnO_{4}^{-} $ to $ Mn^{2+}$ ?

Which of the following metal sols cannot be prepared by Bredig's arc metliod?

Which of the following is not correct regarding the elecolytic preparation of $H_{2}O_{2}$ ?

Which of the following reactions involves carbon-carbon bond formation

Which of the following coordination entities should be expected to absorb light of lowest frequency?

Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?

On the basis of the following thermochemical data $: \left(\Delta f G^{o}H^{+}_{\left(aq\right)}=0\right)$ $H_{2}O\left(\ell\right) \rightarrow H^{+}\left(aq\right)+OH^{-}\left(aq\right); \Delta H=57.32kj$ $H_{2}\left(g\right)+\frac{1}{2}O_{2}\left(g\right) \rightarrow H_{2}O\left(\ell\right); \Delta H=-286.20kj$ The value of enthalpy of formation of $OH^-$ ion at $25^o\,C$ is :

Which of the following has an optical isomer ?