Chemistry questions
29404 published questions with worked solutions.
- If IUPAC name of an element is "Unununnium" then the element belongs to nᵗʰ group of Periodic table. The value of n is ________.
- The compound formed by the reaction of ethanal with semicarbazide contains ________ number of nitrogen atoms.
- The total number of molecular orbitals from 2s and 2p atomic orbitals of a diatomic molecule is ________.
- The rate of First order reaction is 0.04 mol L⁻¹ s⁻¹ at 10 minutes and 0.03 mol L⁻¹ s⁻¹ at 20 minutes after initiation. Half life...
- The pH at which Mg(OH)₂ [K_sp = 1 × 10⁻¹¹] begins to precipitate from a solution containing 0.10 M Mg²⁺ ions is ________.
- The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are
- Given below are two statements: Statement I: S₈ solid undergoes disproportionation reaction under alkaline conditions to from S²⁻...
- Consider the following elements arranged in the periodic table with the group going down and the period across: A′ B′ in the...
- Which of the following is least ionic?
- Identify the name reaction. Benzene → (CO, HCl; Anhydrous AlCl₃/CuCl) → benzaldehyde
- The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are...
- Given below are two statements: Statement I: Aniline reacts with con. H₂SO₄, followed by heating at 453-473 K gives...
- Choose the correct statements from the following A. Mn₂O₇ is an oil at room temperature B. V₂O₄ reacts with acid to give VO₂²⁺ C....
- Choose the correct statements from the following A. All group 16 elements form oxides of general formula EO₂ and EO₃, where E =...
- A(g) ⇌ B(g) + (C/2)(g). The correct relationship between K_p, α and equilibrium pressure P is
- A sample of CaCO₃ and MgCO₃ weighed 2.21 g is ignited to constant weight of 1.152 g. The composition of mixture is: (Given molar...
- Match List I with List II List I (Complex ion): A. [Cr(H₂O)₆]³⁺, B. [Fe(H₂O)₆]³⁺, C. [Ni(H₂O)₆]²⁺, D. [V(H₂O)₆]³⁺ List II...
- Given below are two statements: Statement I: Group 13 trivalent halides get easily hydrolyzed by water due to their covalent...
- The molarity of 1 L orthophosphoric acid (H₃PO₄) having 70% purity by weight (specific gravity 1.54 g cm⁻³) is ________ M. (Molar...
- A compound (x) with molar mass 108 g mol⁻¹ undergoes acetylation to give product with molar mass 192 g mol⁻¹. The number of amino...