List of top Chemistry Questions

A device, in which electrical energy is converted into chemical energy, is called:
In the reaction, $4NH_3 (g) + 5O_2 \rightarrow 4NO(g) + 6H_2O (I)$ When 1 mole of ammonia and 1 mole of $O_2$ are made to react to completion, then
The second order Bragg diffraction of X-rays with $\lambda = 1.0 \mathring{A}$ from a set of parallel planes in a metal occurs at an angle $60^\circ$. The distance between the scattering planes in the crystals is
The Activation energy of a chemical reaction can be determined by
A 5% solution of cane sugar (MW = 342) isisotonic with 1% solution of substance X. The molecular weight of X is
Which one is not paramagnetic among the following? [at. no. of $Be = 4, N e = 10$ , $A s= 33,Cl= 17$]
Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200 g. The number of iron atoms (at. weight of Fe is 56) present in one molecule of haemoglobin are
The number of antibonding electron pairs in $O_2^{2-}$ molecular ion on the basis of molecular orbital theory is (at. no. of $O$ is $18$)
Which one of the following elements constitutes a major impurity in pig iron?
The total number of possible isomers for the complex compound $[Cu^{II}(NH_3)_4] [Pt^{II}Cl_4] $ are
Glucose reacts with X number of molecules of phenyl hydrazine to yield osazone. The value of $ X $ is
The enormous diversity of protein molecules is due mainly to the diversity of
Which of the following compounds is not chiral ?
A one litre flask is full of brown bromine vapours. The intensity of brown colour of vapours will not decrease appreciably on adding to the flask some
In $ PO_{4}^{3-} $ ion, the formal charge on each oxygen atom and $P-O$ bond order respectively are :
The first emission line in the atomic spectrum of hydrogen in the Balmer series appears at:
Hydrogen bonding is not present
The richest source of vitamin A are:
Highly pure dilute solution of sodium in liquid ammonia
Which of the following salt has the same value of vant?s Hoff factor as that of $K _{3}\left[ Fe ( CN )_{6}\right]$ ?
The freezing point of a solution prepared from 1.25 g of non-electrolyte and 20 g of water is 271.9K. If molar depression constant is 1 86 $K m^{-1}$ then molar mass of the solute will be
The solubility of $BaSO_4$ in water is $2.33 \times 10^{-3}$ gram/litre. Its solubility product will be (molecular weight of $BaSO_4 = 233$)
Which of the following has highest boiling point?
For the first order reaction,
A first order reaction, which is $30\%$ complete in $30$ minutes has a half-life period of