Chemistry questions
29404 published questions with worked solutions.
- Liquids **A** and **B** form ideal solution over the entire range of composition. At temperature T, equimolar binary solution of...
- The solubility of a salt of weak acid (**AB**) at pH 3 is Y 10^ -3 mol L^ -1 . The value of **Y** is _____. (Given that the value...
- The correct option(s) regarding the complex [Co(en)(NH_3)_3(H_2O)]^ 3+ ( en=H_2NCH_2CH_2NH_2 ) is (are)
- The correct option(s) to distinguish nitrate salts of Mn^ 2+ and Cu^ 2+ taken separately is (are)
- To measure the quantity of MnCl_2 dissolved in an aqueous solution, it was completely converted to KMnO_4 using the reaction,...
- The surface of copper gets tarnished by the formation of copper oxide. N_2 gas was passed to prevent the oxide formation during...
- Consider the following reversible reaction, A(g)+B(g) AB(g) . The activation energy of the backward reaction exceeds that of the...
- Consider an electrochemical cell: A(s) ,| ,A^ n+ (aq,2 M) , | ,B^ 2n+ (aq,1 M) ,| ,B(s) . The value of H^ for the cell reaction...
- Match each set of hybrid orbitals from LIST–I with complex(es) given in LIST–II. LIST–I P. dsp^2 Q. sp^3 R. sp^3d^2 S. d^2sp^3...
- Fusion of MnO_2 with KOH in presence of O_2 produces a salt **W**. Alkaline solution of **W** upon electrolytic oxidation yields...
- Choose the reaction(s) from the following options, for which the standard enthalpy of reaction is equal to the standard enthalpy...
- Each of the following options contains a set of four molecules. Identify the option(s) where all four molecules possess permanent...
- Among B_2H_6 , B_3N_3H_6 , N_2O , N_2O_4 , H_2S_2O_3 and H_2S_2O_8 , the total number of molecules containing covalent bond...
- At 143 K, the reaction of XeF_4 with O_2F_2 produces a xenon compound **Y**. The total number of lone pair(s) of electrons...
- For the following reaction, the equilibrium constant K_c at 298 K is 1.6 10^ 17 . Fe^ 2+ (aq)+ S^ 2- (aq) FeS (s) When equal...
- On dissolving 0.5 g of a non-volatile non-ionic solute to 39 g of benzene, its vapor pressure decreases from 650 mm Hg to 640 mm...
- Consider the kinetic data given in the following table for the reaction A + B + C Product. array |c|c|c|c|c| Experiment No. & [ A...
- With reference to *aqua regia*, choose the correct option(s)
- Consider the following reactions (unbalanced) Zn + hot conc. H_2SO_4 → **G** + **R** + **X** Zn + conc. NaOH → **T** + **Q**...
- The ground state energy of hydrogen atom is −13.6 eV. Consider an electronic state of He^+ whose energy, azimuthal quantum number...