List of top Chemistry Questions

The ratio of oxidation states of $Cl$ in potassium chloride to that in potassium chlorate is

Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?

The most likely protonation site in the following molecule is

The wave number of the limiting line in Lyman series of hydrogen is 109678 $cm^{-1}$. The wave number of the limiting line in Balmer series of $He^{+}$ would be :

Consider the following phenols : The decreasing order of acidity of the above phenols is

Which of the following molecules has the maximum dipole moment?

If the enthalpy of vaporization of water is $186.5 \,kJ \, mol^{-1}$, the entropy if its vaporization will be :

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)

$N_2$ and $O_2$ are converted into mono anions, $N_2^{-}$ and $O_2^{-}$ respectively. Which of the following statements is wrong ?

Which one of the following is an example of a thermosetting polymer?

For the reversible reaction :
\(N_2(g) + 3H_2(g) ⇋ 2NH_3(g) + \text {Heat}\)
The equilibrium shifts in forward direction :

Reason of lanthanoid contraction is:

Which property of colloids isnot dependent on the charge on colloidal particles?

Which of the following statements is correct for the spontaneous adsorption of a gas?

For a given exothermic reaction, K_p and K'_P are the equilibrium constants at temperatures T₁ and T₂, respectively. Assuming that heat of reaction is constant in temperature range between T₁ and T₂, it is readily observed that:

What products are formed when the following compound is treated with Br₂ in the presence of FeBr₃?

\(Be^{2+}\) is isoelectronic with which of the following ions?

Which one of the following species has plane triangular shape?

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?

Which of the following hormones is produced underthe condition of stress which stimulates glycogenolysis in the liver of human beings?

Which of the following will not be soluble in sodiumhydrogen carbonate?

Acidity of diprotic acids in aqueous solutions increases in the order:

Which one is most reactive towards Nucleophilic addition reaction?

Which of the following organic compounds has same hybridization as its combustion product CO2 ?

Which form coloured salts :