Chemistry questions
29404 published questions with worked solutions.
- The half-life of radioisotope bromine-82 is 36 hours. The fraction which remains after one day is ________ × 10⁻². (Given antilog...
- The total number of anti bonding molecular orbitals, formed from 2s and 2p atomic orbitals in a diatomic molecules is ________.
- Molality of 0.8 M H₂SO₄ solution (density 1.06 cm⁻³) is ________ × 10⁻³ m.
- The total number of molecules with zero dipole moment among CH₄, BF₃, H₂O, HF, NH₃, CO₂ and SO₂ is ________.
- If 50 mL of 0.5 M oxalic acid is required to neutralize 25 mL of NaOH solution, the amount of NaOH in 50 mL of given NaOH...
- The total number of 'Sigma' and 'Pi' bonds in 2-formylhex-4-enoic acid is ________.
- Match List I with List II. List I (Substances): A. Ziegler catalyst B. Blood pigment C. Wilkinson catalyst D. Vitamin B₁₂ List II...
- Given below are two statements : Statement I : The electronegativity of group 14- elements from Si to Pb, gradually decreases....
- In chromyl chloride test for confirmation of Cl⁻ ion, a yellow solution is obtained. Acidification of the solution and addition...
- Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Aryl halides...
- Type of amino acids obtained by hydrolysis of proteins is :
- Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with FeSO₄ in presence of...
- The difference in energy between the actual structure and the lowest energy resonance structure for the given compound is
- In alkaline medium, MnO₄⁻ oxidises I⁻ to
- Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R Assertion A : The first...
- The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is:
- The interaction between π bond and lone pair of electrons present on an adjacent atom is responsible for
- The osmotic pressure of a dilute solution is 7 × 10⁵ Pa at 273 K. Osmotic pressure of the same solution at 283 K is ______ × 10⁴...
- The mass of zinc produced by the electrolysis of zinc sulphate solution with a steady current of 0.015 A for 15 minutes is ______...
- From the compounds given below, number of compounds which give positive Fehling's test is ______. Benzaldehyde, Acetaldehyde,...