Chemistry questions
29404 published questions with worked solutions.
- In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of:Not in JEE Main or NEET syllabus
- The correct option with respect to the Pauling electronegativity values of the elements is:
- For the equilibrium, 2H_2O ⇌ H_3O^+ + OH^-, the value of ΔG° at 298 K is approximately:
- The radius of the largest sphere which fits properly at the centre of the edge of a body centred cubic unit cell is: (Edge length...Not in JEE Main or NEET syllabus
- K_2HgI_4 is 40% ionised in aqueous solution. The value of its van't Hoff factor (i) is:
- Match the following items in column I with the corresponding items in column II. List-I: (i) Na_2CO_3·10H_2O (ii) Mg(HCO_3)_2...Not in JEE Main or NEET syllabus
- The reaction, MgO(s) + C(s) → Mg(s) + CO(g), for which _rH° = +491.1 kJ mol^ -1 and _rS° = 198.0 JK^ -1 mol^ -1 , is not feasible...
- 25 ml of the given HCl solution requires 30 mL of 0.1 M sodium carbonate solution. What is the volume of this HCl solution...
- Consider the sequence: A 4KOH, O_2 2B + 2H_2O (B green); 3B 4HCl 2C + MnO_2 + 2H_2O (C purple); 2C H_2O, KI 2A + 2KOH + D . In...
- The standard reaction Gibbs energy for a chemical reaction at an absolute temperature T is given by _rG° = A - BT, where A and B...
- Among the colloids cheese (C), milk (M), and smoke (S), the correct combination of the dispersed phase and dispersion medium,...Not in JEE Main or NEET syllabus
- A compound 'X' on treatment with Br_2/NaOH, provided C_3H_9N, which gives positive carbylamine test. Compound 'X' is:
- The reaction 2X → B is a zeroth order reaction. If the initial concentration of X is 0.2 M, the half-life is 6 h. When the...
- Given the equilibrium constant K_C of the reaction Cu(s) + 2Ag^+(aq) → Cu^ 2+ (aq) + 2Ag(s) is 10 10^ 15 , calculate the E°_ cell...
- The number of bridging CO ligand(s) and Co–Co bond(s) in Co_2(CO)_8, respectively are:
- The homopolymer formed from 4-hydroxy-butanoic acid is:Not in JEE Main or NEET syllabus
- The coordination number of Th in K_4[Th(C_2O_4)_4(OH_2)_2] is: (C_2O_4^ 2- = Oxalato)
- The relative stability of +1 oxidation state of group 13 elements follows the order:
- If a reaction follows the Arrhenius equation, the plot ln k vs 1 RT gives straight line with a gradient (−y) unit. The energy...
- The concentration of dissolved oxygen (DO) in cold water can go up to: