When aqueous ammonia is added to one of the following solutions,a white precipitate which dissolved in excess ammonia is formed Identify the solution.

• A. ZnCl₂(aq)
• B. Pb(NO₃)₂(aq)
• C. CuSO₄(aq)
• D. FeSO₄(aq)

The function of limestone in the extraction of iron in the blast furnace is

• A. removal of the earthly impurities
• B. decomposition of the iron ore
• C. conversion of iron (lll) to iron (ll) compounds
• D. generation of heat for the process

Which of the following trioxonitrate(V) salts would decompose on heating to form a metal?

• A. Cu(NO₃)₂)
• B. AgNO₃
• C. Pb(NO₃)₂
• D. KNO₃

What volume of oxygen will remain after reacting 8cm of hydrogen gas with 20cm of oxygen gas

• A) 10cm^3
• B) 12cm^3
• C) 14cm^3
• D) 16cm^3

Which of the following compounds gives a yellow residue when heated and also reacts with aqueous sodium hydroxide to give a white gelatinous precipitate soluble in excess sodium hydroxide solution?

• A. (NH4)CO3
• B. ZnCO3
• C. Al2(SO4)3
• D. PbCO3

Which of the following statements is not correct?

• A. Metals high up in the redox series are usually extracted by electrolysis.
• B. Lead is less reactive than magnesium therefore it is lower in the redox series.
• C. Metals ionize by electron gain while non-metals form ions by electron loss
• C. An amphoteric oxide exhibits both acidic and basic properties.

A solid with higher melting and boiling points is likely to be?

• A. Covalent compound
• B. A Dative compound
• C. An Electrovalent compound
• D. A Non-metal

25cm₃ of a mixture of nobel gases was obtained from air after the removal of other constituents. What was the original volume of air

• A. 2,500 cm₃
• B. 1250 cm₃
• C. 125 cm₃
• D. 80 cm₃

Which of the following statements is correct about the periodic table?

• A) Elements in the same period have the same number of valence electrons
• B) The valence electrons of the elements in the same period increase progressively across the period
• C) Elements in the same group have the same number of electron shells
• D) The non-metallic Properties of the elements tend to decrease across each period

How many structural isomers can be written for the alkyl bromide, C4H9Br?

• A. 3
• B. 4
• C. 6
• D. 8