Chemistry questions
29404 published questions with worked solutions.
- The correct sequence of thermal stability of the following carbonates is:Not in JEE Main or NEET syllabus
- What is the molar solubility of Al(OH)_3 in 0.2 M NaOH solution? Given that, solubility product of Al(OH)_3 = 2.4 10^ -24 :
- Peptization is a:Not in JEE Main or NEET syllabus
- Enthalpy of sublimation of iodine is 24 cal g^ -1 at 200 °C. If specific heat of I_2(s) and I_2(vap) are 0.055 and 0.031 cal g^...
- The idea of froth floatation method came from a person X and this method is related to the process Y of ores. X and Y,...Not in JEE Main or NEET syllabus
- An organic compound 'A' is oxidized with Na_2O_2 followed by boiling with HNO_3. The resultant solution is then treated with...
- An ideal gas is allowed to expand from 1 L to 10 L against a constant external pressure of 1 bar. The work done in kJ is:
- An element has a face-centred cubic (fcc) structure with a cell edge of a. The distance between the centres of two nearest...Not in JEE Main or NEET syllabus
- In the following reaction; xA → yB: _ 10 [- d[A] dt ] = _ 10 [ d[B] dt ] + 0.3010. 'A' and 'B' respectively can be:
- The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:
- 5 moles of AB_2 weigh 125 10^ -3 kg and 10 moles of A_2B_2 weigh 300 10^ -3 kg. The molar mass of A (M_A) and molar mass of B...
- An example of a disproportionation reaction is:
- Given: Co^ 3+ + e^- → Co^ 2+ ; E° = +1.81 V; Pb^ 4+ + 2e^- → Pb^ 2+ ; E° = +1.67 V; Ce^ 4+ + e^- → Ce^ 3+ ; E° = +1.61 V; Bi^ 3+...
- °_m for NaCl, HCl and NaA are 126.4, 425.9 and 100.5 S cm^2 mol^ -1 , respectively. If the conductivity of 0.001 M HA is 5 10^ -5...
- Molecules of benzoic acid (C_6H_5COOH) dimerise in benzene. 'w' g of the acid dissolved in 30 g of benzene shows a depression in...
- If the de Broglie wavelength of the electron in nth Bohr orbit in a hydrogenic atom is equal to 1.5 a_0 (a_0 is Bohr radius),...
- Given: (i) C(graphite) + O_2(g) → CO_2(g); _rH° = x kJ mol^ -1 ; (ii) C(graphite) + ½O_2(g) → CO(g); _rH° = y kJ mol^ -1 ; (iii)...
- 8 g of NaOH is dissolved in 18 g of H_2O. Mole fraction of NaOH in solution and molality (in mol kg^ -1 ) of the solution...
- If K_ sp of Ag_2CO_3 is 8 10^ -12 , the molar solubility of Ag_2CO_3 in 0.1 M AgNO_3 is:
- The two monomers for the synthesis of Nylon 6,6 are:Not in JEE Main or NEET syllabus