List of top Chemistry Questions

When molten zinc is converted into solid state, it acquires HCP structure. The number of nearest neighbours will be
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 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 alcohol is heated with conc. $H_2SO_4$ at $443\,K$ ethylene is formed by
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 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
When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains
When $C_2H_5OH$ is treated with acidified $k_2Cr_2O_7$ to forms $CH_3CHO$. It is an example of
When but-1-yne is treated with excess of HBr, the expected product is
When beryllium is bombarded with alpha particles (Chadwick?? experiment) extremely penetrating radiations, which cannot be deflected by electrical or magnetic field are given out. These are :
When benzediazonium chloride in hydrochloric acid reacts with cuprous chloride, then chlorobenzene is formed. The reaction is called
When aqueous solution of $ {Na_2S}$ is titrated with dilute and acidified $ {KMnO_4}$ solution, $Na_2S0_3$ is formed. In this reaction, moles of $ {KMnO_4}$ reduced per mole of $ {Na_2S}$ is
When ammonium chloride is dissolved in water, the solution becomes cold. The change is
When an article is bleached by $SO_2$, the colour can be restored by