List of top Chemistry Questions

The acidity of hydrides of $O , S , Se$, Te varies in the order :

The stability of complexes of $ C{{u}^{2+}},\,\,N{{i}^{2+}},\,\,C{{o}^{2+}} $ and $ F{{e}^{2+}} $ varies in the order:

Which of the following statements is incorrect?

The bond order of $ O_{2}^{+},\,\,{{O}_{2}},\,\,O_{2}^{2-} $ and $ O_{2}^{-} $ varies in the order:

Molecular orbital electronic configuration for $' X'$ anion is : $K K^{*}(\sigma 2 s)^{2}\left(\sigma^{*} 2 s\right)^{2}\left(\pi 2 p_{x}\right)^{2}\left(\pi 2 p_{y}\right)^{2}\left(\sigma 2 p_{z}\right)^{2}$ $\left(\pi^{*} 2 p_{x}\right)^{1}$. The anion ' $X$' is :

The relative Lewis acid character of boron trihalides is in the order:

The mass of a photon with wavelength $ 3.6\,??$ is:

An electron with values $4, 2, -2$ and $+1/2$ for the set of four quantum numbers $ n,\,\,l,\,\,{{m}_{l}} $ and $ s $ respectively, belongs to:

Which of the following compounds is the strongest acid?

Which of the following compounds has the highest boiling point?

Which of the following acts as pickling agent?

Which is chemically most active non-metal?

Which does not react with Fehling solution?

Which is used to obtain salicylic acid from phenol?

Variable valency is a general feature of

Two rigid boxes containing different ideal gases are placed on a table. Box $A$ contains one mole of nitrogen at temperature $T_0$, while box $B$ contains one mole of helium at temperature $(7/3)\, T_0$. The boxes are then put into thermal contact with each other, and heat flows between them until the gases reach a common final temperature (Ignore the heat capacity of boxes). Then, the final temperature of the gases, $T_f$, in terms of/$T_0$ is :

Transition elements form a large number of coordination compounds because they have

What is the cell reaction occurring in Daniel cell (Galvanic cell)?

The percentage of soil volume occupied by pore space is called porosity of soil. It is minimum in:

The number of ether isomers possible for $C_{4}H_{10}O$ are:

The magnitude of any physical quantity

The lightest particle is:

The increasing order of stability of the following free radicals is:

The incorrect statement among the following is

The hybrid state of sulphur in SO$_3$ molecule is