Science Practice Quiz 32

Q1.What term is used for the impurities such as soil and sand that contaminate ores mined from the earth?

A. Slag B. Flux C. Gangue D. Matrix

Q2.Metals in the middle of the activity series are mainly found in the earth's crust as which of the following forms?

A. Free elements B. Oxides, sulphides, or carbonates C. Nitrates D. Chlorides

Q3.Besides being found in the free state, copper and silver are also found in nature in which combined forms?

A. As their chlorides or nitrates B. As their sulphates or phosphates C. As their sulphides or oxide ores D. As their carbonates or silicates

Q4.Based on reactivity, into how many categories can metals be grouped according to the provided text?

A. Two B. Three C. Four D. Five

Q5.Which type of metals, due to their high reactivity, require electrolysis for their extraction according to the activity series diagram?

A. Metals of low reactivity (e.g., Au, Ag) B. Metals of medium reactivity (e.g., Zn, Fe, Pb) C. Metals of high reactivity (e.g., K, Na, Ca, Mg, Al) D. Metals found in the native state (e.g., Cu, Ag)

Q6.On what principle are the techniques for removing gangue from an ore based?

A. Differences in the physical or chemical properties of the gangue and the ore. B. Similarities in the physical or chemical properties of the gangue and the ore. C. The magnetic properties of the ore only. D. The density of the gangue only.

Q7.How can the oxides of metals low in the activity series be reduced to their metallic form?

A. By heating alone. B. By reacting with highly reactive metals. C. By electrolysis. D. By strong cooling.

Q8.Cinnabar (HgS) is an ore of which metal?

A. Copper B. Zinc C. Mercury D. Iron

Q9.What happens when cinnabar (HgS) is heated in air, followed by further heating of the product?

A. It is directly converted to mercury. B. It is first converted to mercuric oxide, then reduced to mercury. C. It is converted to sulfur dioxide and mercury. D. It forms a stable compound that cannot be reduced.

Q10.Which of the following metals is considered moderately reactive and belongs to the middle of the activity series?

A. Sodium B. Calcium C. Aluminium D. Zinc

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Science Practice Quiz 32