Chemistry questions
29404 published questions with worked solutions.
- According to the Periodic Law of elements, the variation in properties of elements is related to their
- Which one of the following substances has the highest proton affinity?
- Which one of the following pairs of molecules will have permanent dipole moments for both members?
- Which one of the following compounds has the smallest bond angle in its molecule?
- The pair of species having identical shapes for molecules of both species is
- The internal energy change when a system goes from state A to B is 40 kJ/mole. If the system goes from state A to B by a...
- If at 298 K the bond energies of C-H, C-C, C=C and H-H bonds are respectively 414, 347, 615 and 435 kJ mol^ -1 , the value of...
- In an irreversible process taking place at constant T and P and in which only pressure-volume work is being done, the change in...
- The correct relationship between free energy change in a reaction and the corresponding equilibrium constant K_c is
- The enthalpy change for a reaction does not depend upon
- For the reaction equilibrium N_2O_4(g) 2NO_2(g) the concentrations of N_2O_4 and NO_2 at equilibrium are 4.8 10^ -2 and 1.2 10^...
- Consider the reaction equilibrium 2SO_2(g) + O_2(g) 2SO_3(g); H^0 = -198 kJ. On the basis of Le Chatelier's principle, the...
- The solubility in water of a sparingly soluble salt AB is 1.0 10^ -5 mol L^ -1 . Its solubility product number will be
- When rain is accompanied by a thunderstorm, the collected rain water will have a pH value
- Several blocks of magnesium are fixed to the bottom of a ship to
- Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite
- Bottles containing C_6H_5I and C_6H_5CH_2I lost their original labels. They were labelled A and B for testing A and B were...
- In the anion HCOO^- the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?
- The IUPAC name of CH_3COCH(CH_3)_2 is
- The general formula C_nH_ 2n O_2 could be for open chain