List of top Chemistry Questions

Which of the following formulae is mismatched?
What is the percentage of free space in $fcc$ and $bcc$?
Tincture of iodine is
The yellow colour in $NaCl$ crystals is due to
The standard electrode potential for Daniell cell is $1.1\, volt$. What is the standard Gibbs energy for the reaction?
The species $ {Ar, K^+}$ and $ {Ca^{2+}}$ contain the same number of electrons. In which order do their radii increase?
The polymer obtained by the interaction of ethylene glycol and terephthalic acid is
The heat of combustion of carbon to $ {CO_2}$ is $ {- 393.5 \, kJ/mol}$. The heat released upon formation of 35.2 g of $ {CO_2}$ from carbon and oxygen gas is:
The function of "Sodium pump" is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of the pump?
The equilibrium constant for the equilibrium $PCl _{5}(g) \rightleftharpoons PCl _{3}(g)+ Cl _{2}(g)$ at a particular temperature is $2 \times 10^{-2}\, mol L ^{-1}$. The number of moles of $PCl _{5}$ that must be taken in a one litre flask at the same temperature to obtain a concentration of $0.20$ mole of chlorine at equilibrium is
The domestic sewage in large cities
The degeneracy of hydrogen atom that has energy equal to $\frac{-R_{ H }}{9}$ is (where $R_{ H }=$ Rydberg constant)
The antibiotics have no effect on viruses because
Photochemical smog always contains
Number of possible isomers for the complex $ {[Co(en)_2Cl_2] Cl}$ will be : (en = ethylenediamine)
Number of possible alkynes with formula $C_5H_8$ is
More number of oxidation state are exhibited by the actinoids than by lanthanoids. The main reason for this is :
Method by which Aniline cannot be prepared is :
"Metals are usually not found as nitrates in their ores". Out of the following two (a and b) reasons which is/are true for the above observation? (a) Metal nitrates are highly unstable. (b) Metal nitrates are hightly soluble in water.
Maximum bond angle at nitrogen is present in which of the following?
Copper sulphate is dissolved in water containing ________ for making Bordeaux mixture.
Teflon is chemically inert substance. Chloroform when treated with antimony trifluoride gives teflon.
$ BeSO_4$ is soluble in water while $BaSO_4$ is not. Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.
Choose the correct statement :
Amongst the following, the most stable complex is