List of top Chemistry Questions

$2$ g of a base whose equivalent weight is $40$ reacts with $3g$ of an acid. The equivalent weight of the acid is:

Determine the empirical formula of an oxide of iron, which has 69.9% iron and 30.1% dioxygen by mass.

Why does the following reaction occur?
\(XeO_6^{4-}(aq) + 2F^ - (aq) + 6H^ + (aq) \rightarrow XeO_3(g) + F_2(g) + 3H_2O(l)\) What conclusion about the compound \(Na_4XeO_6\)(of which \(XeO_6^{4-}\) is a part) can be drawn from the reaction.

The ionization enthalpy of second period elements vary with atomic number as The elements present at points B and E are

Which of the following gives iodoform on heating with a solution of $ {I_2}$ containing $ {Na_2CO_3}$ ?

In both DNA and RNA, heterocyclic base and phosphate ester linkages are at 

Which of the following alkane cannot be made in good yield by Wurtz reaction ?

Which of the following statements about the electron is incorrect ?

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

In the reaction, $ {Cl2 + CH4 ->[hv] CH3Cl + HCl}$ presence of a small amount of oxygen

For the reaction $ {NH_3 + OCl^{-} -> N_2H_4 + Cl^{-}}$ the coefficient of $N_2H_4$ in the balanced equation will be

Difference between $S$ and $S^{2-}$ as $S^{2-}$ has

The number of isomeric forms that are represented by C7H9N is:

The products obtained when chlorine gas reacts with cold and dilute aqueous $NaOH$ are:

Nitrogen has no d-orbital in its valence shell and therefore it cannot1) Exhibits the oxidation state of +52) Have covalency greater than 33) Exhibit orbital Hybridization4) Form oxides with oxidation states greater than +5Select the correct answer using codes given below:

In a first order reaction, the concentration of reactant is reduced to $1/8$ of the initial concentration in $75$ minutes at $298 \,K$. What is the half-life period of the reaction in minutes?

If $1.202g{mL}^{-1}$ is the density of $20\mathrm{\%}$ aqueous KI, determine the molality of KI.

All alkali metals are good dash agents?

Consider the reaction \(Cr_2O_7^{-2}\) + xH\(^+\) + Fe\(^{2+}\) → yFe\(^{3+}\) + 2Cr\(^{3+}\) + zH\(_{2}\)O Sum x, y, z?

What is the maximum number of emission lines when the excited electron of a H atom in n = 6 drops to the ground state?

How many of the given metals will show photoelectric effect when light of 400 nm falls on below metal? Metal Li Na K Mg Cu Ag W(eV) 2.42 2.3 2.25 3.7 4.8 4.3:

The ionization constant of acetic acid is 1.74 × 10^–5. Calculate the degree of dissociation of acetic acid in its 0.05 M solution. Calculate the concentration of acetate ion in the solution and its pH.