Chemistry questions
29404 published questions with worked solutions.
- The p K_a of HCN is 9.30. The pH of a solution prepared by mixing 2.5 moles of KCN and 2.5 moles of HCN in water and making up...
- Which of the following will produce a buffer solution when mixed in equal volumes?
- The ionisation constant of an acid, K_a, is the measure of strength of an acid. The K_a values of acetic acid, hypochlorous acid...
- The pH of a sample of vinegar is 3.76. Calculate the concentration of hydrogen ion in it.
- 0.01 mole of lime (CaO) was dissolved in 100 cm^3 of water. Assuming the base is completely ionised in the solution, the pH of...
- NaOH(aq), HCl(aq) and NaCl(aq) concentration of each is 10^ -3 M. Their pH will be respectively
- pH of a solution of a strong acid is 5.0. What will be the pH of the solution obtained after diluting the given solution 100...
- The ionisation constant of acetic acid is 1.74 10^ -5 . The degree of dissociation of acetic acid in its 0.05 M solution and its...
- Ionisation constant of CH_3COOH is 1.7 10^ -5 and [ H^+ ] is 3.4 10^ -4 . Then, initial concentration of CH_3COOH molecules is
- The conjugate base of NH_2^- is
- Which of the following is correct regarding bond energies of NO , NO^+ and NO^- ?
- Which of following requires maximum energy to undergo decomposition?
- What is the structure of XeF_6 ?
- Of the three molecules XeF_6 , SF_4 , SiF_4 , which have tetrahedral structure?
- Isostructural species are those, which have the same shape and hybridisation. Among the given species, identify the isostructural...
- Which of the following is paramagnetic?
- Which of the following statements is correct regarding BeCl_2 molecule?
- In NO_3^- ion, the number of bond pairs and lone pairs of electrons on nitrogen atom are
- Which of the following set possess sp^3-hybridisation?
- Match the type of bond (given in Column I) with method of formation (given in Column II) and choose the correct option from the...