UI Chemistry 2014/2015 Past Questions

200 cm³ of air was passed over heated copper in a syringe several times to produce copper (II) oxide. When cooled, the final volume of air recorded was 158 cm³. Estimate the percentage of oxygen in the air.

30cm³ of oxygen at 10 atmosphere pressures is placed in a 200dm³ container. Calculate the new pressure if temperature is kept constant.

Bond dissociation energy of $500 KJ mol^-1$ may be assigned to

A mixture of iron and sulphur can be separated by dissolving the mixture in ..........

A mixture of sand, ammonium chloride and sodium chloride is best separated by ..........

A pure solid usually melts .........

A small quantity of solid ammonium chloride was heated gently in a test tube; the solid gradually disappeared to produce a mixture of two gases. Later a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone ............

CH₄ has this geometry:

Chlorine, consisting of two isotopes of mass numbers 35 and 37, has an atomic mass of 35.5. The relative abundance of the isotope of mass number 37 is

Elements P, Q, R, S, have 6, 11, 15 and 17 electrons respectively, therefore

In the oil drop experiment, Millikan determined the

One of these atomic shells is the most stable

The abnormally high boiling point of water is primarily due to

The energy required to remove an electron from the isolated gaseous atom is known as

The group that oxygen belongs to is collectively called

The ideal gas equation is

The number of atoms in one mole of a substance is equal to

The number of electrons in the outermost shell of the atom represents its

The number of protons or electrons of an atom represents its

The partial pressure of oxygen in a sample of air is 500 mmHg. If the total Pr pressure 780 mmHg, what is the mole fraction of the oxygen?

The periodic classification of the elements is an arrangement of the elements in order of their

The process of changing one element into another is called

The shapes of CC₂, H₂₄ respectively are

This compound exhibits ionic bonding