Tag: chemistry of non-metals

Questions Related to chemistry of non-metals

Metals generally extracted by electrolysis of their fused salts are highly:

chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. electropositive 

  2. electronegative

  3. depends on temperature

  4. depends on impurities in the metal

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Correct Option: A

You may be "shocked" to discover that metals are good conductors of electricity. Which of the following statements best explains why metals behave in this way?

chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Metallic bonding can be described as an "electron sea" with mobile valence electrons.

  2. Metals tend to have higher densities than nonmetals.

  3. Metals tend to have higher melting points than nonmetals.

  4. Metals tend to have rather large values for electronegativity.

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Correct Option: A
Explanation:

Ans : (A) Metallic bonding can be described as an 'Electron Sea' with mobile valence Electron.

Note: - In metals, the outer Electrons of atom belong to a 'cloud' of delocalised $e^{\ominus}$. They are no longer firmly held by a specific atom, but instead they can move freely through the lattice of positive metals ions. $\therefore$ Metals are good conductor of Electricity.

You have three solids. One is a metal; one is an ionic compound; one is a molecular/covalent compound. You test all three solid samples to identify their bonding.

Sample Appearance Melting Point $(^{\circ}C)$ Conductivity
A Shiny $962$ conductive
B Crystalline $801$ conductive in aqueous solution
C Powdery $186$ not conductive

Based on this data, identify the type bonds present in each sample.

chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Sample A is a metal.

    Sample B is a salt.

    Sample C is a molecule.

  2. Sample A is a molecule.

    Sample B is a metal.

    Sample C is a salt.

  3. Sample A is a salt.

    Sample B is a metal.

    Sample C is a molecule.

  4. Sample A is a molecule.

    Sample B is a salt.

    Sample C is a metal.

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Correct Option: A
Explanation:

Ans : (A) Sample $A$ is metal

(B) Sample $B$ is a salt
(C) Sample $C$ is a molecule
Note : - (1) We know that metal possers shiny properties and it is a good conductor of electricity.
(2) Ionic salt is dissolved in water make an electrically conductive solution. Ionic compound is formed from strong electrostatic interaction between ions which result in a higher melting point.
(3) Molecule do not have free $e^{\ominus}$ to conduct the Electricity.

Molten silver absorbs _________ which is given off on cooling causing violent spurting. This is called splitting of silver and can be prevented by covering the molten metal with a layer of charcoal.

chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. carbon monooxide

  2. carbon dioxide

  3. carbon

  4. charcoal

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Correct Option: B
Explanation:

Molten silver absorbs oxygen which is given off on cooling causing violent spurting. This is called splitting of silver and can be prevented by covering the molten metal with a layer of charcoal.

The percent of silver in silver - copper alloy used for jewellery purposes has _______ % silver.

chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. 20

  2. 40

  3. 60

  4. 80

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Correct Option: D
Explanation:

The percent of silver in silver - copper alloy used for jewellery purposes has 80 % silver and 20% copper. Silver copper alloy is used in coins, ornaments, silver ware, decoration pieces, etc.

Which of the following is/are true regarding the physical properties of silver?

chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. It is white, lustrous, lightweight metal.

  2. It is very malleable and ductile, coming before gold in this property.

  3. It is poor conductor of heat and electricity.

  4. None of the above.

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Correct Option: D
Explanation:

The following  are true regarding the physical properties of silver.
It is white, lustrous, heavy metal.
It is very malleable and ductile, coming next to gold in this property.
It is best conductor of heat and electricity.

An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess?

chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Metal

  2. Non-Metal

  3. Metalloid

  4. Semi-conductor

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Correct Option: A
Explanation:

Metal

Malleable high melting and boiling point, lustrous hard, high density and a good conductor of heat and electricity.

Which of the following is/are true regarding uses of silver?

chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Silver leaves are used in filling teeth.

  2. Silver amalgam is used in Ayurvedic and Yunani medicines.

  3. Silver is used in silver plating.

  4. It is used in the preparation of silver salts used in silvering of mirrors, photography and medicine.

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Correct Option: C,D
Explanation:

The following are true regarding uses of silver.
Silver amalgam is used in filling teeth.
Silver leaves are used in Ayurvedic and Yunani medicines.
Silver is used in silver plating.
It is used in the preparation of silver salts used in silvering of mirrors, photography and medicine.

__and ___are alloys of copper.

chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Brass and bronze

  2. Brass and alloy steel

  3. Copper pyrites and malachite

  4. Copper glance and cuprite

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Correct Option: A
Explanation:

  • A homogeneous mixture of two or more elements is known as Alloys.
  • There are various alloys of copper:
Brass-Copper with zinc, Bronze-Copper with tin, and Coinage alloy-copper with nickel.
  • Hence, option  A is correct.

Classify the following as physical or chemical properties.
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.

chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Physical property

  2. Chemical property

  3. Both $A$ and $B$

  4. Neither $A$ or $B$

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Correct Option: A
Explanation:

Steel is an alloy of various metals, physically combined together in a fixed amount by weight, to improve the physical and mechanical properties.