Chemistry — 2001

Elements which belong to the same group in the Periodic Table are characterized by

The atom of an element X combines with aluminium (\(_{13}\)AI). What is the formula of the compound formed?

The presence of unpaired electrons in an atom of a transition metal gives rise to

What is responsible for metallic bonding?

Which of the following compounds is covalent?

A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of

Which of the following features of a human skeleton can be determined by carbon-dating?

Which of the following statements about ideal gases is/are correct? 1. The cohesive forces between their particles are negligible ll. They have no definite volume but occupy the volume of their containers III. They are not compressible IV. Their particles collide with loss of energy

P\(_{TOTAL}\) = P\(_1\) + P\(_2\) + P\(_3\) + ...Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of

Which of the following pairs of reagents react to produce hydrogen?

A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by

Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?

In which of the reactions represented by the following equations is HNO3 behaving as a typical acid?

A gas was evolved when a sample of gastric juice reacted with sodium trioxocarbonate (IV) . The gas evolved was

It can be concluded that gastric juice

What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1

Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = - 65.7 kJmol-1. From the equation, it can be deduced that

A reaction is represented by the equation below. A2(g) + B2(g)  → 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct?

What is the oxidation number of nitrogen in Al(NO\(_3\))\(_3\)?

What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O

Which of the following substances decomposes when an electric current is passed through it?

A concentrated solution containing H+, Cu2+,OH- and CI- was electrolyzed using platinum electrodes which of the ions will be discharged at the cathode?

Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?

In the electrolysis of CuSO4(aq) using copper electrodes, the reaction at the anode is

A feasible cell was constructed by joining the two half cells below. Cu\(^{2+}\) (aq) + 2e\(^-\) → Cu(s) E\(^0\) = +0.34 V; Zn\({^2+}\) + 2e\(^-\) → Zn\((_s)\) E\(^0\) = - 0.76V. What is the standard e.m.f. of the cell?

Hydrogenation of butene yields

Benzene produces more soot than ethene on burning because benzene

One of the products of combustion of pentane in excess air is

Which of the following polymers contains nitrogen?

What is the function of H2SO4 in the following reaction? C12H22O11 conc. H2SO4 → 12C + 11H2O

Which of the following constitutes an advantage in the use of hard water?

Sugars can be hydrolyzed at room temperature by the action of

If 10 cm 3 of distilled water is added to 10 cm3 of an aqueous salt solution, the concentration of the solution

Which of the following reactions represents the change that occurs when a photographic film is exposed to sunlight?

Acidic industrial waste can be treated with

Waste plastics accumulate in the soil and pollute the environment because plastic materials are

The conclusion from Rutherford's radioactive substance alpha-scattering experiment is that

If a metal R forms a compound with the formula R(NO3)2 the formula of its tetraoxosulphate (VI) is

Which of the following decreases when a given mass of gas is compressed to half its initial volume?

What volume of hydrogen will be produced if 100cm 3 of ammonia is completely decomposed at constant temperature and pressure? The equation for the reaction is 2NH 3(g) → N 2(g) + 3H 2(g)

The gas given off when NH4Cl is heated with an alkali is

A major factor considered in selecting a suitable method for preparing a simple salt is its

Which of the following acids forms normal salts only?

A substance is said to be hygroscopic if it absorbs?

Which of the following substances increases in mass when heated in air?

Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution [NaOH = 40 g mol]

Which of the following salt solutions will have a pH greater than 7?

What will happen if more heat is applied to the following system at equilibrium? X2(g) + 3Y 2(g) ⇌ 2XY3(g); ∆H =-kJmol -1

Equal amounts of marble chips are reacted separately with 100cm3 of hydrochloric acid of different concentrations . if all the marble chips reacted, which of the following remained the same in each case?

CuSO4 5H2O can be obtained from an aqueous solution of copper (ll) tetraoxosulphate (VI) by

Which of the compounds will leave a metal residue when heated?

A visible change is observed when a strip of iron is placed in an aqueous solution of