List of top Chemistry Questions

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

Soap mixed with water below critical micelle concentration behaves as

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

$SO_2$ and $NO_2$ cause polluted by increasing

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

Smelting is usually carried out in

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

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

Relative decrease in V.P. of an aqueous solution of NaCl is 0.167. Number of moles of NaCl presentin 180 g of $H_2O$ is

Refractory metals are used in construction of furnaces because

Reductive ozonolysis of benzene produces

Reductive ozonolysis of o-xylene gives

Red phosphorus and hydrogen iodide reduce carboxylate ions to

Red phosphorus is less reactive than yellow phosphorus because