Chemistry questions
29404 published questions with worked solutions.
- Number of spectral lines obtained in He⁺ spectra, when an electron makes transition from fifth excited state to first excited...
- Number of metal ions characterized by flame test among the following is ________. Sr²⁺, Ba²⁺, Ca²⁺, Cu²⁺, Zn²⁺, Co²⁺, Fe²⁺
- Two reaction are given below : 2Fe(s) + (3/2)O₂(g) → Fe₂O₃(s), ΔH° = –822 kJ/mol; C(s) + ½O₂(g) → CO(g), ΔH° = –110 kJ/mol. Then...
- 2-chlorobutane + Cl₂ → C₄H₈Cl₂ (isomers). Total number of optically active isomers shown by C₄H₈Cl₂, obtained in the above...
- The pH of an aqueous solution containing 1 M benzoic acid (pK_a = 4.20) and 1 M sodium benzoate is 4.5. The volume of benzoic...
- Given below are two statements. Statement (I) : The gas liberated on warming a salt with dil H₂SO₄, turns a piece of paper dipped...
- In the given reactions, identify the reagent A and reagent B. Toluene → ["A" + (CH₃CO)₂O, 273–283 K] → [Intermediate] → H₃O⁺, Δ →...
- Match List-I with List-II. List-I (Species): (A) Cr²⁺, (B) Mn⁺, (C) Ni²⁺, (D) V⁺ List-II (Electronic distribution): (I) 3d⁸, (II)...
- Sugar which does not give reddish brown precipitate with Fehling's reagent, is
- Match List-I with List-II. List-I (Molecule): (A) BrF₅, (B) H₂O, (C) ClF₃, (D) SF₄ List-II (Shape): (I) T-shape, (II) See saw,...
- Compound A formed in the following reaction reacts with B gives the product C. Find out A and B. CH₃–C≡CH + Na → A →(B)...
- Given below are two statements Statement (I) : The orbitals having same energy are called as degenerate orbitals. Statement (II)...
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : CH₂ =...
- The Lassaigne's extract is boiled with dil. HNO₃ before testing for halogens because,
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : There...
- What happens to freezing point of benzene when small quantity of naphthalene is added to benzene?
- On a thin layer chromatographic plate, an organic compound moved by 3.5 cm, while the solvent moved by 5 cm. The retardation...
- 2MnO₄⁻ + bI⁻ + cH₂O → xI₂ + yMnO₂ + zOH⁻. If the above equation is balanced with integer coefficients, the value of z is ________.
- 0.05 cm thick coating of silver is deposited on a plate of 0.05 m² area. The number of silver atoms deposited on plate are...
- The mass of sodium acetate (CH₃COONa) required to prepare 250 mL of 0.35 M aqueous solution is ________ g. (Molar mass of...