List of top Chemistry Questions

One mole of calcium phosphide on reaction with excess water gives

Xenon forms fluorides. Because 5d-orbitals are available for valence shell expansion.

Which oxide of nitrogen is obtained on heating ammonium nitrate at $250^{\circ} C$ ?

Which of the following exhibits the weakest intermolecular forces?

Which is the strongest acid in the following ?

Which among the following has the largest dipole moment?

The strongest conjugate base is

The propene reacts with $HBr$ to form

The product(s) obtained via oxymercuration $(HgSO_4+HgSO_4)$ of 1-butyne would be

The meta-directing group in the following is

The heat of formation of $ PC{{l}_{5}}(s) $ will be: Given: $ 2P(s)+3C{{l}_{2}}(g)\xrightarrow{{}}2PC{{l}_{3}}(l); $ $ \Delta H=-151.8\,k\,cal $ $ PC{{l}_{3}}(l)+C{{l}_{2}}(g)\xrightarrow{{}}PC{{l}_{5}}(s)\,; $ $ \Delta H=-\,32.8\,k\,cal $

The correct statement regarding defects in solids is

The correct order of the increasing ionic character is

Percentage of lead in lead pencil is

Oxidation state of $Fe$ in $Fe_3O_4 \, is $

Internal energy does not include

In the reaction: Phenol $ { ->[{NaOH}][{CHCl_3}] }$ $A$ $ { ->[{H^+}][{}] }$ $B, B$ is identified as

If magnesium atom having atomic number $12$ has an isotope with mass number $26$, then the number of protons, neutrons and electrons respectively of the atom are

If $300\,mL$ of a gas at $27^{\circ} C$ is cooled to $7^{\circ} C$ at constant pressure, its final volume will be

$CuSO_4$ reacts with $KCN$ solution and forms

Red phosphorus is chemically less reactive than white phosphorus because :

Buna-S is polymer of:

Zinc displaces copper from copper sulphate solution. The $E^{\circ}_{298\, K}$ of $Zn$ is $-0.76 \,V$ and that of $Cu$ is $+0.34 \,V$.

Tailing of mercury occurs on passing ozone through it. Due to oxidation of mercury.

Lower aldehydes and ketones are soluble in water but the solubility decreases as the molecular masses increase. Distinction between aldehydes and ketones can be made by Tollens??test.