List of top Chemistry Questions

When the universal gas constant (R) is divided by Avogadro's number $(N_o)$,their ratio is called
When sodium reacts with excess of oxygen oxidation number of oxygen changes from
When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to
When propanal reacts with $2$-methylpropanal in presence of $NaOH$, four different products are formed. The reaction is known as
When $SO_2$ is passed through acidified $K_2Cr_2O_7$ solution
When ozone reacts with phosphorus the oxidation state of P changes from
When primary amine is heated with $CS_2$ in the it gives isothiocyanate. This reaction is called
When plaster of Paris comes in contact with water it sets into a hard mass. The composition of the hard mass is
When $MnO_2$ is fused with $KOH$ and $O_2$, what is the product formed and its colour? $MnO_2 + KOH + O_2 \to ? + H_2O$
When nitric acid is heated with $P_2O_5$, the oxide nitrogen that is produced is
When molten zinc is converted into solid state, it acquires HCP structure. The number of nearest neighbours will be
When methyl isocyanide is heated with sulphur the product formed is
When methanol is sprinkled over hot copper plate the smell would be
When $KMnO_4$ is added to oxalic acid, the decolourisation is slow in the beginning but becomes instantaneous after sometime because
When excess of carbon dioxide is passed through lime water, the milkiness first formed disappears due to
When gels are allowed to stand, they give out small quantity of liquid (or water). This process is called
When $H_2S$ is passed through nitric acid, the productis
When ethyl chloride is heated with excess of concentrated ammonia, the major product formed is
When ethyl nitrile is subjected to reduction with Sn/HCl, the pair of compounds formed are
When ethyl hydrogen sulphate is heated with excess of alcohol at 410 K, the product obtained is
When ethyl alcohol is heated with conc. $H_2SO_4$ at $443\,K$ ethylene is formed by
When dispersed phase is liquid and dispersion medium is gas then the colloidal system is called
When diethyl ether is heated with dil. $H_2SO_4$ under it gives
When $ {CH_3CH_2Br}$ reacts with sodium acetylide, the main product is
When chloroform is exposed to light and air, it forms