Question : Lanthanides are often called:
Option 1: Alkali metals
Option 2: Rare earth elements
Option 3: Inert gases
Option 4: D-block elements
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Correct Answer: Rare earth elements
Solution : The correct answer is Rare earth elements.
Lanthanides are sometimes known as rare earth elements. These are a set of 15 chemical elements in the periodic table with atomic numbers ranging from 57 (lanthanum) to 71 (lutetium). They are dubbed "rare earth" because they were initially discovered in unusual minerals, however, they are not uncommon in the Earth's crust.
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Question : Which of the following are members of 15 naturally occurring metallic chemical elements whose atomic numbers are between 57 and 71?
Option 2: Lanthanides
Option 3: Halogens
Option 4: Actinides
Question : Inert gases are
Option 1: miscible with water
Option 2: not stable
Option 3: chemically unreactive
Option 4: chemically very reactive
Question : The mountain formed on the earth crust due to tension is called
Option 1: Young folded mountains
Option 2: Old folded mountains
Option 3: Laccolith mountains
Option 4: block mountains
Question : Catalytic converters are generally made from:
Option 1: Alkaline metals
Option 2: Hydrogen
Option 3: Transition metals
Option 4: Carbon
Question : Which of the following group elements are called chalcogens?
Option 1: Group 16
Option 2: Group 2
Option 3: Group 17
Option 4: Group 18
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