List of top Chemistry Questions

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 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 but-1-yne is treated with excess of HBr, the expected product is
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
When ammonia and sodium hypochlorite are allowed to react,which nitrogen compound is formed ?
When alkaline earth metals dissolve in ammonia, they form coloured solution like alkali metals. Which of the following observations regarding the reaction are correct ? (i) Dilute solutions are bright blue in colour due to solvated electrons. (ii) These solutions decompose to form amides and hydrogen. (iii) From this solution the ammoniates $[M(NH_3)_6]^{2+}$ can be recovered by evaporation.
When acidified $K_2Cr_2O_7$ solution is added to $Sn^{2+}$ salts, then $Sn^{2+}$ changes to
When $AgNO_3$ is heated strongly the products formed are
When alkyl aryl ether is heated with HI, it gives
When acetylene is treated with HBr, the product is
When a solid melts there is
When a mixture of air and steam is passed over red hot coke, the outgoing gas is
When a mixture of NaCl and KCl is heated with cone. $H_2SO_4$ and $K_2Cr_2O_7$. The red gas obtained is
When a metal is to be extracted from its ore and if the gangue associated with the ore is silica, then
When a lead storage battery is discharged
When a lead storage battery is charged it acts as
When a lead storage battery is discharged
When a colloidal solution is viewed from the direction at right angles of light beam, the path of the beam is illuminated due to scattering of light. In the figure $(A)$ and $(B)$ are
When 2-pentyne is treated with dil.$H_2SO_4$ and $HgSO_4$ the product formed is
When 2-bromobutane reacts with alcoholic KOH, the reaction is called
When 0.5 ampere of electricity is passed in aqueous solution of $AgNO_3$ for 200 seconds,the amount of silver deposited on cathode is(Z = 0 001118 g C'for Ag)