NPCIL Trainee Representative Metals, Metalloids, and Nonmetals — practice questions
20 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NPCIL Trainee Representative Metals, Metalloids, and Nonmetals in the app →Elements in which the s and p orbitals are being filled are classified as:A metalloid is best defined as an element that:Several representative metals such as aluminum, zinc, and tin react only slowly with air. This slow reactivityWhich alkali metal has the lowest density of any metal?When an alkali metal reacts with water, what products are formed?In a flame test, sodium and its compounds impart which characteristic colour to the flame?In a flame test, which alkaline earth metal produces a characteristic green colour?Within the same period, why are alkaline earth metals (group 2) less reactive than alkali metals (group 1)?Why is most magnesium production used to make lightweight alloys?Aluminum is described as "amphoteric." What does this mean?How many elements are classified as metalloids in the periodic table?Why do metalloids conduct electricity less well than true metals?Boron's outer electron structure is 2s²2p¹, giving it one less valence electron than valence orbitals. What oxBy mass, silicon makes up close to what fraction of the earth's crust, ranking second in abundance only to oxySolid carbon dioxide exists as discrete molecules held together by weak intermolecular forces. How does solid An alloy of mercury with one or more other metals is called a(n):Bronze and solder are two well-known alloys of tin. What are their respective co-metals?Under normal chemical conditions, why do nonmetals not form monatomic cations (positive ions)?About half of the world's zinc production is used for what purpose?A reaction in which the same element is simultaneously oxidized and reduced is called a: