Chemistry questions
29404 published questions with worked solutions.
- For a reaction taking place in three steps at same temperature, overall rate constant K = K_1K_2 K_3 . If Ea₁, Ea₂ and Ea₃ are...
- Number of compounds with one lone pair of electrons on central atom amongst following is ________ O₃, H₂O, SF₄, ClF₃, NH₃, BrF₅,...
- For the reaction N₂O₄(g) ⇌ 2NO₂(g), K_p = 0.492 atm at 300 K. K_c for the reaction at same temperature is ____________ × 10⁻²....
- A solution of H₂SO₄ is 31.4% H₂SO₄ by mass and has a density of 1.25 g/mL. The molarity of the H₂SO₄ solution is ______M (nearest...
- The number of species from the following which are paramagnetic and with bond order equal to one is ______. H₂, He₂⁺, O₂⁺, N₂²⁻,...
- Choose the correct statements about the hydrides of group 15 elements. A. The stability of the hydrides decreases in the order...
- Given below are two statements : Statement-I : Since Fluorine is more electronegative than nitrogen, the net dipole moment of NF₃...
- Reduction potential of ions are given below: ClO₄⁻ E° = 1.19 V, IO₄⁻ E° = 1.65 V, BrO₄⁻ E° = 1.74 V. The correct order of their...
- Given below are two statements: Statement I : High concentration of strong nucleophilic reagent with secondary alkyl halides...
- The correct stability order of carbocations is
- The solution from the following with highest depression in freezing point/lowest freezing point is
- Given below are two statements: Statement-I : Along the period, the chemical reactivity of the elements gradually increases from...
- A and B formed in the following reaction are : CrO₂Cl₂ + 4NaOH → A + 2NaCl + 2H₂O, A + 2HCl + 2H₂O₂ → B + 3H₂O
- IUPAC name of following compound is: CH₃–CH(NH₂)–CH₂–CN
- The orange colour of K₂Cr₂O₇ and purple colour of KMnO₄ is due to
- Which among the following purification methods is based on the principle of "Solubility" in two different solvents?
- Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : H₂Te is more...
- Total number of species from the following which can undergo disproportionation reaction is ________. H₂O₂, ClO₃⁻, P₄, Cl₂, Ag,...
- Number of complexes which show optical isomerism among the following is ________. cis-[Cr(ox)₂Cl₂]³⁻, [Co(en)₃]³⁺,...
- NO₂ required for a reaction is produced by decomposition of N₂O₅ in CCl₄ as by equation 2N₂O₅(g) → 4NO₂(g) + O₂(g). The initial...