List of top Chemistry Questions

Solid $ {CO2}$ is known as dry ice:

Solid $X$ is a very hard solid which is electrical insulator in solid as well as in molten state and has extremely high melting point. What type of solid is it?

Solid $CH_4$ is

Sodium thiosulphate $(Na_2S_2O_3.5H_2O)$ is used in photography to

Sodium when dropped in water catches fire because

Soft drinks and baby feeding bottles are generally made up of

Sodium sulphate is soluble in water but barium sulphate is insoluble because

Sodium metal cannot be stored in

Sodium metal is kept under

Sodium extract of Lassaigne?? solution is treated with, $FeSO_4, FeCl_3$ and $dil.H_2SO_4$ to get a blood red colour. Which of the following is probable organic compound?

Sodium carbonate can be manufactured by Solvay??s process but potassium carbonate cannot be prepared because

Soaps do not work in hard water containing calcium and magnesium ions because

$ {SnCl2}$ gives a precipitate with a solution of $ {HgCl2}$. In this process $ {HgCl2}$ is

Soap mixed with water below critical micelle concentration behaves as

$SO_2$ and $NO_2$ cause polluted by increasing

$SO_2$ is one of the air pollutants. $SO_2$

$ {SnCl2 + 2HgCl2 -> }$$\underset{\text{White ppt.}}{ {(A)}}$ $ {(A) + SnCl2 -> }$$\underset{\text{Grey}}{ {(B)}}$ A and B are

Smelting is usually carried out in

Six moles of an ideal gas performs a cycle shown in figure. If the temperature are $T_A = 600\, K, T_B = 800\, K, T_C = 2200 \,K$ and $T_D = 1200\, K$, the work done per cycle is approximately

$S_N1$ reaction is fastest in

$S_N2$ mechanism is involved in the following substitution :

Same amount of electric current is passed through solutions of $AgNO_3$ and HCl. If 1.08 g of silver is obtained in the first case, the amount of hydrogen liberated at S.T.P. in the second case is

$S_{N}1$ reaction is favoured by

Roasting is generally done in case of the following

Roasting of copper pyrite ores is for the following purpose