Chemistry questions
29404 published questions with worked solutions.
- Hyperconjugation involves overlap of the following orbitals
- Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence ofNot in JEE Main or NEET syllabus
- Under the same reaction conditions, initial concentration of 1.386 mol dm^ -3 of a substance becomes half in 40 seconds and 20...
- 2.5 mL of 2 5 M weak monoacidic base (K_b = 1 10^ -12 at 25 °C) is titrated with 2 15 M HCl in water at 25 °C. The concentration...
- STATEMENT-1: Bromobenzene upon reaction with Br_2/Fe gives 1,4-dibromobenzene as the major product. STATEMENT-2: In bromobenzene,...
- STATEMENT-1: Pb^ 4+ compounds are stronger oxidizing agents than Sn^ 4+ compounds. STATEMENT-2: The higher oxidation states for...
- STATEMENT-1: For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero. STATEMENT-2: At constant...
- Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar ?
- A gaseous hydrocarbon gives upon combustion 0.72 g. of water and 3.08 g. of CO₂. The empirical formula of the hydrocarbon is -
- The rate of a reaction doubles when its temperature changes from 300 K to 310 K. Activation energy of such a reaction will be :...
- A compound with molecular mass 180 is acylated with CH₃COCl to get a compound with molecular mass 390. The number of amino groups...
- Which one of the following molecules is expected to exhibit diamagnetic behaviour ?
- In which of the following pairs of molecules/ions, both the species are not likely to exist ?
- The coagulating power of electrolytes having ions Na⁺, Al³⁺ and Ba²⁺ for arsenic sulphide sol increases in the order -Not in JEE Main or NEET syllabus
- Consider the following reaction : xMnO_4^- + yC_2O_4^ 2- + zH^+ xMn^ 2+ + 2yCO_2 + z 2 H_2O The values of x, y and z in the...
- Which of the following exists as covalent crystals in the solid state ?Not in JEE Main or NEET syllabus
- A solution of (–) – 1 – chloro – 1 – phenylethane in toluene racemises slowly in the presence of a small amount of SbCl₅, due to...
- An unknown alcohol is treated with the "Lucas reagent" to determine whether the alcohol is primary, secondary or tertiary. Which...
- How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with...
- The molarity of a solution obtained by mixing 750 mL of 0.5(M)HCl with 250 ml of 2(M)HCl will be -
Page 1Next