Home » General Knowledge » General Science

Metals (coinage group): Which of the following pairs does not contain any coinage metal? Coinage metals are Cu, Ag and Au in Group 11 of the periodic table. Choose the pair with zero coinage metals.

Difficulty: Easy

Zinc and tin
Silver and gold
Copper and silver
Copper and gold

Correct Answer: Zinc and tin

Explanation:

Given data

Coinage metals: copper (Cu), silver (Ag), gold (Au).

Concept/Approach
Pairs containing any of Cu/Ag/Au include coinage metals and are therefore not correct. A pair of non-coinage metals (e.g., Zn and Sn) contains none.

Reasoning
Check each pair:• Silver & gold → both coinage (reject).• Copper & silver → both coinage (reject).• Copper & gold → both coinage (reject).• Zinc & tin → neither is coinage (accept).

Final Answer
Zinc and tin

← Previous Question Next Question→

More Questions from General Science

Periodic table (f-block): The actinide series comprises elements with which atomic-number range? Identify the standard range used in chemistry for actinides. Choose the correct range.
Physical properties: Which of the following metals is liquid under normal room conditions? Consider ambient temperature and standard pressure. Choose the correct metal.
Alloys (bell metal): Bell metal is an alloy of which two metals? Identify the traditional composition used for bells with sonorous tone. Choose the correct alloy pair.
Reactive metals storage: Under which liquid is metallic sodium safely stored? Prevent rapid reaction with air moisture and oxygen. Choose the correct storage medium.
Minerals (silicates): Quartz crystals used in clocks and electronics are chemically what compound? Identify the correct oxide making up quartz (rock crystal). Choose the correct compound.
Applied chemistry (LPG safety): Ethyl mercaptan is added to otherwise odourless LPG to impart a detectable smell. Identify the chemical family/element that characterizes ethyl mercaptan (ethyl thiol). Choose the correct element.
Materials: Name the property of a substance that absorbs moisture from air upon exposure. Focus on the phenomenon where solids pick up atmospheric water; in some cases they even dissolve in it. Choose the correct term.
Water treatment (hardness): Removing permanent hardness of water by chemical addition. Select the compound that effectively removes Ca²⁺/Mg²⁺ hardness by precipitation. Choose the correct reagent.
Minerals and ores: Monazite — identify the element for which it is an important ore. Think of rare earth/thorium-rich beach sands in India. Choose the correct element.
Basic classification: Which of the following is an element (not a compound/mineral)? Identify the choice consisting of a single chemical element in its pure form. Choose the correct option.

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion