The boiling point of a liquid such as methanol is the temperature at which its

• A) vapour pressure is equal to 1 atmosphere
• B) vapour pressure is equal to the atmospheric pressure
• C) reactants and products are at standard states
• D) vapour pressure doubles atmospheric pressure

Lucas reagent is used to test for

• A) alkanes
• B) alkanoic acids
• C) alkanols
• D) amines

At 27°C, 58.5g of sodium chloride is present in 250cm^3 of a solution. The solubility of sodium chloride at this temperature is? (molar mass of sodium chloride = 111.0gmol^−1)

• A) 2.0 moldm^−3
• B) 0.25 moldm^−3
• C) 1.0 moldm^−3
• D) 0.5 moldm^−3

Which of the following salts is slightly soluble in water?

• A) AgCl
• B) CaSO4
• C) Na2CO3
• D) PbCl2

(a) Give the formula indicating the relationship between entropy, free energy and enthalpy changes of a system.

(b) For each of the following, state whether entropy change is positive, negative or zero.

(i) H\(_2\)O\(_{(g)}\) -> H\(_2\)O\(_{(g)}\)

(ii) Cl\(_{2(g)}\) ---> 2CI\(_{(g)}\)

(iii) HCI\(_{(g)}\) -> HCl\(_{(g)}\)

In an electrochemical cell, polarization is caused by

• A) chlorine
• B) oxygen
• C) tetaoxsulphate (Vl) acid
• D) hydrogen

Which of the following elements would produce coloured ion in agueous solution?

• A. Calcuim
• B. Copper
• C. Magnesuim
• D. Sodium

The chlorinated alkane often used industrially to remove grease is?

• A. Tetrachloromethane
• B. Chloromethane
• C. Trichloromethane
• D. Dichloromethane

Which of the following metals can be prepared in samples by the thermal decomposition of their trioxonitrate (V) salts?

• A. Copper and mercury
• B. Silver and copper
• C. Mercury and silver
• D. Magnesium and mercury

Which of the following substances cannot be classified as a heavy chemical?

• A. AgNO3
• B. CaO
• C. CaOCI2
• D. H2SO4