List of top Chemistry Questions

Oxidation state of osmium (Os) in $OsO_4$ is

Which of the following will not undergo hydrolysis in water?

The covalent compound $ HCl $ has the ionic character as:

An element with atomic number $26$ will be found in group :

The constant $'a'$ in van der Wall's equation is maximum in :

$ {{E}_{n}}=-\frac{313.6}{{{n}^{2}}} $ . If the value of $ {{E}_{n}}=-34.84 $ to which of the following values does $'n'$ correspond?

The screening effect of $'d'$ electrons is:

The pressure of atmosphere air is $ 720\text{ }mm $ . The pressure of water vapour in the air is:

Which compound is obtained when formaldehyde is treated with ammonia?

Pure propanone can be prepared by ozonolysis of:

Principle/which gives a way to fill the electrons in the available energy levels is:

An example of anthraquinone dye is

Nylon-66 is made by using

Which of the following order for ionization energy is correct ?

Which of the following species is isoelectronic with CO?

Which of the following element has the maximum electron affinity ?

The number of ?

Oxidation number of ???

Gammexane is :

A positive carbylamine test is given by

The oxidation number of sulphur in $S_8 , S_2F_2, H_2S$ respectively, are

The normality of 0.3 M phosphorus acid $(H_3PO_3)$ is

The coordination number of metal crystallising in a hexagonal close packing is

Ionic radii of

A gas will approach ideal behaviour at