List of top Chemistry Questions

Acidity of diprotic acids in aqueous solutions increases in the order:
Which one of the following is an example of a thermosetting polymer?
\(Be^{2+}\) is isoelectronic with which of the following ions?
The weight of silver (at wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be:
When 0.1 mol MnO42– is oxidised the quantity of electricity required to completely oxidise MnO42– to MnO4– is
The pair of compounds that can exist together is:
Which of the following organic compounds has same hybridization as its combustion product CO2 ?
Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is:
Among the following sets of reactants which one produces anisole ?
Magnetic moment 2.83 BM is given by which of the following ions?
(At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)
1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much ?
(At. wt. Mg =24; O=16)
Which of the following organic compoundspolymerizes to form the polyester Dacron?
Which of the following compounds will undergo racemisation when solution of KOH hydrolysis?
Which of the following compounds will undergo racemisation when solution of KOH hydrolysis?
Which of the following orders of ionic radii is correctly represented?
Which of the following will be most stable diazoniumsalt RN2+X- ?
Which of the following salts will give highest pH in water ?
Which of the following hormones is produced underthe condition of stress which stimulates glycogenolysis in the liver of human beings?
Which one of the following is not a commoncomponent of Photochemical Smog?
The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives:
In acidic medium, H2O2 changes Cr2O72- to CrO5 which has two (-O-O-) bonds. Oxidation state of Cr in CrO5 is
What products are formed when the following compound is treated with Br2 in the presence of FeBr3?
What products are formed when the following compound is treated with Br2
For $Cr_2O_7^{-2} + 14H^{+} + 6e^{-} \to 2Cr^{+3} + 7H_2O; E $$^\circ$= $1.33 V At [Cr_2O_7 ^{-2}] = 4.5$ milli mole $[Cr^{+3}]=15$ milli mole, $E$ is $1.067\, V$.The pH of the solution is nearly equal to
Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?
An elemental crystal has a density of $8570 \,kg / m ^{3}$. The packing efficiency is $0.68$. The closest distance of approach between neighbouring atom is $2.86 \,?$. What is the mass of one atom approximately?
$3.92\,g$ of ferrous ammonium sulphate react completely with $50\, ml \frac{N}{10} KMnO_{4}$ solution. The percentage purity of the sample is