FUTO Chemistry 2005/2006 Past Questions

Practice each question, then open it to see the full details.

When air, which contains the gases: oxygen, nitrogen, carbon dioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are

A.nitrogen and carbon dixodie
B.the rare gases
C.nitrogen and oxygen
D.nitrogen and the rare gases
E.nitrogen, carbon dioxide and the rare gases

When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as

A.disintegration
B.polymerization
C.cracking
D.degradation
E.distillation

The pH of four solutions W, X, Y, Z are 4, 6, 8, 10, respectively, therefore

A.none of the solutions is acidic
B.the pH of Y is made more acidic by addition of distilled water
C.Z is the most acidic solution
D.W is the most acidic solution
E.X is neutral

When each of the nitrates of potassium, magnesium and iron is heated

A.all the nitrates decompose to their oxides
B.the nitrates of magnesium gives the nitrite and oxygen
C.the nitrate of magnesium and iron give the oxides
D.the nitrate of iron gives the nitrite and oxygen
E.the nitrate of magnesium is not decomposed

Which of the following contains two amphoteric oxides?

A.sodium oxide, zinc oxide, magnesium oxide
B.aluminum oxide, calcium oxide, zinc oxide
C.potassium oxide, lithium oxide, magnesium oxide
D.silver oxide, lead oxide, sodium oxide
E.sulphur dioxide, aluminum oxide, carbon monoxide

Helium atoms are chemically unreactive because

A.there are no electrons around the nucleus
B.the number of protons equal the number of electrons
C.there are equal number of protons and neutrons in the nucleus
D.the outer electron shell is completely filled
E.the atoms contain only protons

50cm³ of hydrogen are sparked with 20cm³ of oxygen at 100°C and 1 atmosphere. The total volume of the residual gases is

A.50cm³
B.10cm³
C.40cm³
D.30cm³
E.70cm³

How many grams of HBr would exactly be required to react with 2g of propyne? (C = 12, H = 1, Br = 80)

A.4.1g
B.6.1g
C.8.1g
D.10.1g
E.16.2g

When ammonium potassium and calcium carbonates are each separately heated

A.none of them will decompose
B.each of them will decompose to give carbon dioxide and the respective oxide
C.ammonium carbonate and potassium carbonate will not decompose
D.only ammonium carbonate wil decompose to give carbon dioxide and the respective oxide
E.ammonium carbonate will decompose to give carbon dioxde, water and ammonia

Under high pressure, real gases do not obey gas laws because their molecules

A.have become more energetic
B.have become less energetic
C.have become smaller in size
D.decompose into atoms
E.start repelling each other

500cm³ oxygen was collected over water 30°C and 752mmHg pressure. What is the volume of dry oxygen at STP (Vapour pressure of water at 30°C = 32mmHg)

A.475cm³
B.415cm³
C.586cm³
D.500cm³
E.427cm³

Which of the following statement is an exception in the assumptions of the kinetic theory of gases?

A.gases are composed of many elastic particles
B.the particles are of negligible size
C.the particles are in constant random motion
D.the particles are of negligible mass
E.the particles collide with each other

Which of the following statement is true?

A.metals conduct electricity while non-metals do not
B.metals have high density, non-metals have low density
C.metals form basic oxides, non-metals form acidic oxides
D.metals lose electrons while non-metals gain electrons during normal reactions

5.00g of hydrated salt of barium when heated to a constant weight gave 4.26g of anhydrous salt with a molecular weight of 208. The number of molecules of water of crystallization in the hydrated salt is

A.10
B.7
C.5
D.2
E.1

In the reaction of oxygen with hydrogen to produce water, which of the following statement is true.

A.One atom of hydrogen reacts with two atoms of oxygen to give one molecule of water
B.two atoms of hydrogen react with two atoms of oxygen to give two molecules of water
C.one molecule of oxygen react with one molecule of hdyrogen to give two molecules of water
D.one molecule of hydrogen reacts with two molecules of oxygen to give one molecule of water
E.one molecule of oxygen reacts with two molecules of hydrogen to give two molecules of water

Oxidation is a process of

A.gain of electrons
B.loss of electrons
C.gain of hydrogen
D.loss of oxygen
E.addition of an electro-positive element to substance

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

A.the atomic number
B.the Avogadro number
C.the gas constantthe number of neutrons
D.the number of electrons

Which of the following statement is NOT true of electrovalent compounds?

A.They are solids
B.they do not vaporize easily
C.the elements forming the compound normally have their valency electrons in a shared state
D.they conduct electricity

If concentrated sulphuric acid is added to sugar and warmed gently. The sugar changes from white to brown and finally to a black mass of carbon. In this reaction, concentrated sulphuric acid is acting as

A.a drying agent
B.and oxidizing agents
C.a dehydrating agent
D.a reducing agent
E.a hydrolyzing agent.