RSUT Chemistry 2011/2012 Past Questions

The molarity of 5% by weight of aqueous solution of tetraoxosulphate (VI) acid [molecular weight = 98] is

Valence shell electron pair theory through hybridization predicts that boron trichloride is

The basic tenet of valence bond electron pair repulsion theory is that the pairs of electrons making the sigma bonds dictate the shape of molecules. The pi-bonds often encounter in some molecules serve to

A chemical equilibrium is established when

Oxygen is extracted from water by

Excess ethanol was soaked with 3g of pure oxygen in a combustion chamber. How many molecules of CO₂ are produced? [N = 6.02 x 10²³ molecules mol^-1]

40g of sodium nitrate were. If the solubility of the salt is 10.50 mol/dm³ at the same temperature, what percentage of the salt is left undissolved? [Na = 23, N = 14 and 0 = 16] A. 11.56% B. 2.55% C. 5.88% D. 12.45%

The energy for the dissociation of molecule AB in kJ in the diagram of energy against the reaction coordinate shown below is:

An electron described by the quantum number, n = 4, L = 3 can be located in what orbital?

An aqueous solution of a crystalline salt reacts with dilute HCl to give a yellow precipitate and a gas that turned dichromate paper green. The crystalline salt may be