List of top Chemistry Questions

How do we separate two sulphide ores by froth floatation method?

Holme?? signal uses chemical compound

Hofmann bromamide degradation reaction is shown by_____________ .

Higher concentration of nitrogen dioxide in atmospheric air causes

Highest oxidation state of manganese in fluorides is $+4 (MnF_4)$ but highest oxidation state in oxides is $+7 (Mn_2O_7)$ because

Hexafluorocobaltate (III) ion is a high spin complex. The hybrid state of cobalt is

HF is not stored in glass bottles because

HI can be prepared by all the following methods, except

Hess's law states,

Helium-oxygen mixture is used by deep sea diversin preference to nitrogen-oxygen mixture because

Heating of ore in presence of air to remove sulphur impurity is called

Heating pyrites air to remove sulphur dioxide is known as

Heating a mixture of sodium benzoate and soda lime gives

Heating an aqueous solution of aluminium chloride to dryness will give

HCl is a gas but HF is a low boiling liquid. This is because

Halogens are all coloured because

Hardy-Schulze rule explains the effect of electrolytes on the coagulation of colloidal solution. According to this rule, coagulation power of cations follow the order

Haloforms are trihalogen derivatives of

Halogen family forms one of the most homogeneous group of the periodic table because

H-O-H bond angle in H$_2O$ is 104.5$^{\circ}$ and not 109$^{\circ}$ 28' because of

$H_3PO_3$, phosphorus acid is

$ {H_2S}$ is passed through an acidified solution of copper sulphate and a black precipitate of cupric sulphide is formed. This is due to

$H_2S$ is more acidic than $H_2O$ because

Gypsum is added to portland cement to

Group $16$ elements have lower value of first ionisation enthalpy as compared to group $15$ elements because