UNIZIK Chemistry 2012/2013 Day 1 Past Questions

If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. the pale green solution is

A solid c when heated gives off a brown gas. If x is soluble in excess sodium hydroxide solution but insoluble in excess ammonium hydroxide solution, then x is

When excess ethanol is heated to 145°C in the presence of concentrated sulphuric acid, the product is

Given the mean atomic mass of chlorine prepared in the laboratory to be 35.5 and assuming that chlorine contains two isotopes of mass numbers 35 and 37, what is the percentage composition of the isotope of mass number 35?

The oxidation state of manganese in KMnO₄ is

28.8cm³ of nitrogen at 15°C is cooled to 0°C at constant pressure, the new volume of nitrogen is

The electronic configurations of elements X and Y are X = 2, 8, 6, Y = 2, 8, 7. The bond in the compound formed by X and Y is expected to be

If 1 mole of aluminum contains 6x10²³ atoms of aluminum, how many atoms are contained in 0.9g of aluminum?

1.0g of the oxide of metal X (atomic mass = 64) gave 0.80g of the metal when reduced with hydrogen. The formula of the oxide is

Cotton is almost pure

The cracking process is very important in the petroleum industry because it

Stainless steel is an alloy of

The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is

If the molar mass of X is 36g, the number of moles of X dissolved at 343K is

What process would coal undergo to give gas, coal tar, ammoniacal liquor and coke?