BUK Chemistry 2009/2010 Past Questions

Sodium chloride may be obtained from brine by

20cm³ of hydrogen gas are sparked with 20cm³ of oxygen gaas in an endiometer at 373 (100°C) and 1 atmosphere. The resulting mixture is cooled to 298k (25°C) and passed over calcium chloride. The volume of the residual gas is

An organic compound with a vapor density of 56.5 has the following percentage composition.
C= 53.1% N= 12.4% H= 62%. The molecular formula of the compound is?

Manganese(iv)oxide reacts with concentrated hydrochloric acid according to the equation MnO₂ + XHCl ⟶ MnCl + Cl₂ + YH₂O. X and Y are

A molar solution of caustic soda is prepared by dissolving

Which of the elements -1.Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc will not react with either water or steam

Lime water which is used in laboratory detection of carbon(iv)oxide is an aqueous solution of

An element that can exist in two or more different structural forms which possess the same chemical properties is said to exhibit

The hybridization of carbon in ethyne is

When the kerosene fraction from petroleum is heated at high temperature, a lower boiling liquid is obtained. This process is known as

Which of the following electrodes is used in electrolysis of Bauxite (Al₂O₃) in molten cryolite

Alkaline hydrolysis of naturally occurring fats and oil yields

Which of the following represents carboxylic acid

If the cost of electricity required to deposit 1g of magnesium is N500, how much would it cost to deposit 10g of aluminium?

Copper tetraoxosulphate (vi) solution was electrolysed using copper electrodes. The mass of copper deposited at the anode by the passage of 16,000 coulombs of electricity is

₁³R, ₉¹⁹U, ₁₂²⁴S, ₁₀²⁰T, ₁₆¹⁷Y Which of the following statement is not true of elements R ,U , S, T, Y

Water is said to be hard if it

What is the molar mass of a substance if 0.4 mole of the substance has a mass of 25.0

The order in which a mixture of sand, ammonium and sodium chloride can be separated is

The volume of 2.5 moles of oxygen at S.T.P is

Nuclear fission involves the splitting of a heavy element into two nuclei of

2C₂H_(g)) + 5O_2(g) ⟶ 4CO_2(g) + 2H₂O. In this reaction, the mass of carbon(iv)oxide produced on burning 78g of ethyne is

A particle that contains 11 protons, 12 neutrons and 10 electrons is probably a

The element with the electron configuration 1S² 2S² Sp³ is

A difference between chemical and physical change is that in chemical change