List of top Chemistry Questions

Identify the complex ion/s with the least spin only magnetic moment (in BM).
I) [Fe(CN)$_6$]$^{3-}$
II) [Co(CN)$_6$]$^{3-}$
III) [Mn(CN)$_6$]$^{4-}$
IV) [Fe(CN)$_6$]$^{4-}$
Identify the reaction which occurs in blast furnace at temperature of above 900 K.
The osmotic pressure of 0.01 molar solution of an electrolyte is found to be 0.65 bar at 27°C. The van’t Hoff factor of the electrolyte is (R = 0.083 bar L K$^{-1}$ mol$^{-1}$)
The number of monochloro derivatives possible for 2,2-Dimethylbutane and 2,3-Dimethylbutane are respectively
The buffer system that helps in maintaining pH of blood between 7.26 and 7.42 is
The conjugate acid and base of ammonia are X and Y, respectively. What are the shapes of X and Y?
The BOD value of clean water is X. The maximum concentration of cadmium recommended in drinking water is Y. X and Y respectively are
For the reactions: NaBH$_4$ + I$_2$ $\rightarrow$ A + NaI + H$_2$, and A + LiH $\rightarrow$ B, what are A and B, respectively? (Reactions are not balanced)
Vessel (A) contains 1 mole each of H$_2$ and I$_2$, and vessel (B) contains 2 moles each of H$_2$ and I$_2$. Both vessels are at the same temperature and reach equilibrium for the reaction H$_2$(g) + I$_2$(g) $\rightleftharpoons$ 2HI(g). What is the ratio of the equilibrium constants $K_p$ for vessels A and B?
Observe the following molecules: ClF, SF$_4$, CH$_4$, NH$_3$, XeF$_4$, PCl$_5$. The number of molecules in which the central atom has expanded octet is:
One mole of an ideal gas is contained in a 1 L vessel at T(K) with a pressure of p atm. The vessel is split into two equal parts. What are the pressure and volume in each part?
The sum of number of antibonding electrons present in O$_2$, O$_2^+$, O$_2^-$ is:
Identify the amide which gives propan-1-amine by Hoffmann bromamide reaction.
What are X and Z in the following reaction sequence? (X forms sodium alkynide) \[ X (C_4H_6) \xrightarrow{{partial reduction}} Y \xrightarrow{H_2O/H^+} Z ({major product}) \]
Which of the following compounds give salt of an acid and alcohol on heating with concentrated KOH?
What is Z in the given reaction sequence? \[ {(1) } B_2H_6 \longrightarrow X \xrightarrow{PCC} Y \xrightarrow{NH_2OH} Z \] \[ {(2) } H_2O, H_2O_2, OH^- \]

What are X and Y respectively, in the following set of reactions? 

What are X and Y respectively in the following set of reactions? 

Identify the pair which is not correctly matched:
Polyacrylonitrile is used as a substitute for wool in making commercial fibres as acrilan. The structure of it is:

Match the following complexes with their number of unpaired electrons:

List-I (Complex) List-II (No. of unpaired electrons) 
A) \([\mathrm{MnCl}_6]^{3-}\) I) 5 
B) \([\mathrm{FeF}_6]^{3-}\) II) 2 
C) \([\mathrm{Mn(CN)}_6]^{3-}\) III) 0 
D) \([\mathrm{Co(C}_2\mathrm{O}_4)_3]^{3-}\) IV) 4 

Match the following molecules with their bond angles:

List-I (Molecule) List-II (Bond angle) 
A) \(\mathrm{NH}_3\) I) 102.2° 
B) \(\mathrm{O}_3\) II) 107.8° 
C) \(\mathrm{S}_6\) III) 93.6° 
D) \(\mathrm{PH}_3\) IV) 117° 
A liquid mixture of aniline and 'x' forms a non-ideal solution with negative deviation from Raoult's law. What is 'x'?
What are the mole fractions of glucose and water respectively, in 20% (w/w) aqueous glucose solution? (\(C = 12\,u\); \(O = 16\,u\); \(H = 1\,u\))
A compound consists of atoms A and B. The atoms of B form hcp lattice. The atoms of A occupy \(\frac{1}{3}\) rd of octahedral voids and \(\frac{1}{3}\) rd of tetrahedral voids. What is the molecular formula of the compound?