UNIZIK Chemistry 2015/2016 Day 1 Past Questions

Sieving is a technique used to separate mixtures containing solid particles of

25cm³ of a gas X contains Z molecules at 15T and 75mmHg. How many molecules will 25cm³ of another gas Y contain at the, same temperature and pressure?

What current in amperes will deposit 2.7g of aluminium in 2hours?
[Al = 27, F = 96500 C/mol]

When chlorine is passed into water and the resulting solution exposed to sunlight, the products formed are

The fuming of kettles is caused by the presence in water of

Cancerous growths are cured by exposure to

During the vulcanization of rubber, sulphur is added to

The gas that can best be collected by downward displacement of air is

25cm³ of a 0.2moldm^-3 solution of Na₂CO₃ requires 20cm³ of a solution of HCl for neutralization. The concentration of the HCl solution is

The gas that gives brown colouration in brown ring test is

The postulate of Dalton's atomic theory which still holds is that

Hydrogen is readily released when dilute hydrochloric acid reacts with

What amount of mercury would be liberated lithe same quantity of electricity that liberate 0.65g of zinc is applied

When dissolved in water, NaOH flakes show

P_(g) + G_(g) <--> 3R_(s) + S_(g) , ∆H is negative.
Which of the following will increase the yield of R?