Chemistry questions
29404 published questions with worked solutions.
- Geometrical shapes of the complexes formed by the reaction of Ni^ 2+ with Cl^- , CN^- and H_2O , respectively, are
- Dissolving 120 g of urea (mol. wt. 60) in 1000 g of water gave a solution of density 1.15 g/mL. The molarity of the solution is
- Among the following compounds, the most acidic is
- Extraction of metal from the ore cassiterite involvesNot in JEE Main or NEET syllabus
- The correct statement(s) pertaining to the adsorption of a gas on a solid surface is (are)Not in JEE Main or NEET syllabus
- The difference in the oxidation numbers of the two types of sulphur atoms in Na_2S_4O_6 is
- Reaction of Br_2 with Na_2CO_3 in aqueous solution gives sodium bromide and sodium bromate with evolution of CO_2 gas. The number...
- The maximum number of electrons that can have principal quantum number, n = 3, and spin quantum number, m_s = - 1 2 , is
- To an evacuated vessel with movable piston under external pressure of 1 atm., 0.1 mol of He and 1.0 mol of an unknown compound...
- The total number of alkenes possible by dehydrobromination of 3-bromo-3-cyclopentylhexane using alcoholic KOH is
- A decapeptide (Mol. Wt. 796) on complete hydrolysis gives glycine (Mol. Wt. 75), alanine and phenylalanine. Glycine contributes...
- Oxidation states of the metal in the minerals haematite and magnetite, respectively, are
- Among the following complexes (K–P), K_3[Fe(CN)_6] (K), [Co(NH_3)_6]Cl_3 (L), Na_3[Co(oxalate)_3] (M), [Ni(H_2O)_6]Cl_2 (N),...
- Passing H_2S gas into a mixture of Mn^ 2+ , Ni^ 2+ , Cu^ 2+ and Hg^ 2+ ions in an acidified aqueous solution precipitates
- Consider the following cell reaction: 2Fe_ (s) + O_ 2(g) + 4H^+_ (aq) 2Fe^ 2+ _ (aq) + 2H_2O(l) E^ = 1.67 V At [ Fe^ 2+ ] = 10^...
- The freezing point (in °C) of a solution containing 0.1 g of K_3[Fe(CN)_6] (Mol. Wt. 329) in 100 g of water (K_f = 1.86 K kg mol^...
- Reduction of the metal centre in aqueous permanganate ion involves
- The equilibrium 2Cu^I Cu^0 + Cu^ II in aqueous medium at 25 °C shifts towards the left in the presence of
- For the first order reaction 2N_2O_5(g) 4NO_2(g) + O_2(g)
- Among the following, the number of compounds than can react with PCl_5 to give POCl_3 is O_2 , CO_2 , SO_2 , H_2O , H_2SO_4 ,...