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NPCIL Trainee Representative Metals, Metalloids, and Nonmetals — practice questions

Explore 11 free Representative Metals, Metalloids, and Nonmetals questions in NPCIL Trainee Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Representative Metals, Metalloids, and Nonmetals questions and exercises with answers

Showing questions 1–11 of 11.

Elements in which the s and p orbitals are being filled are classified as:Read the answer and worked solution →Which alkali metal has the lowest density of any metal?Read the answer and worked solution →When an alkali metal reacts with water, what products are formed?Read the answer and worked solution →In a flame test, sodium and its compounds impart which characteristic colour to the flame?Read the answer and worked solution →In a flame test, which alkaline earth metal produces a characteristic green colour?Read the answer and worked solution →Aluminum is described as "amphoteric." What does this mean?Read the answer and worked solution →How many elements are classified as metalloids in the periodic table?Read the answer and worked solution →By mass, silicon makes up close to what fraction of the earth's crust, ranking second in abundance only to oxygen?Read the answer and worked solution →An alloy of mercury with one or more other metals is called a(n):Read the answer and worked solution →About half of the world's zinc production is used for what purpose?Read the answer and worked solution →A reaction in which the same element is simultaneously oxidized and reduced is called a:Read the answer and worked solution →

Worked practice questions

Elements in which the s and p orbitals are being filled are classified as:

  1. representative elements
  2. transition elements
  3. inner transition elements
  4. noble gases only
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Correct answer: A. representative elements

1. The periodic table can be divided into blocks according to which orbital type is being filled with the last electron. 2. The text states: "The representative elements are elements where the s and p orbitals are filling." 3. Transition elements instead have d orbitals filling, and inner transition elements have f orbitals filling. 4. So elements filling s and p orbitals are, by definition, the representative elements. _Source: OpenStax Chemistry Ch 18 "Representative Metals, Metalloids, and Nonmetals", p.964 §18.1 Periodicity_

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Which alkali metal has the lowest density of any metal?

  1. Sodium
  2. Potassium
  3. Cesium
  4. Lithium
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Correct answer: D. Lithium

1. Alkali metals (group 1) are unusually soft and light compared to most other metals. 2. The text states: "lithium...has the lowest density of any metal (0.5 g/cm3)." 3. This is why lithium famously floats even on paraffin oil, which is itself a low-density liquid. 4. So among the alkali metals -- and among all metals -- lithium has the lowest density. _Source: OpenStax Chemistry Ch 18 "Representative Metals, Metalloids, and Nonmetals", p.966 §18.1 Periodicity_

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When an alkali metal reacts with water, what products are formed?

  1. Hydrogen gas and the metal hydroxide
  2. The metal oxide and oxygen gas
  3. The metal chloride and hydrogen gas
  4. Water and the metal peroxide
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Correct answer: A. Hydrogen gas and the metal hydroxide

1. Alkali metals are strong reducing agents that readily give up their single valence electron. 2. The text states: "The alkali metals all react vigorously with water to form hydrogen gas and a basic solution of the metal hydroxide." 3. For example, lithium reacts with water as 2Li(s) + 2H2O(l) → 2LiOH(aq) + H2(g), producing lithium hydroxide and hydrogen gas. 4. There is no chlorine present to form a chloride, and no oxygen gas or peroxide forms in this particular reaction. 5. So the products of an alkali metal reacting with water are hydrogen gas and the metal hydroxide. _Source: OpenStax Chemistry Ch 18 "Representative Metals, Metalloids, and Nonmetals", p.966 §18.1 Periodicity_

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