Tag: physical properties of metals and non-metals

Questions Related to physical properties of metals and non-metals

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.

Which of the following is/are true about silver plating?

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

  1. The process of depositing a thin layer of silver electrolytically on metal surface is called silver plating.

  2. The article to be silver plated is made the anode

  3. Cathode consists of pure silver.

  4. The bath contains a solution of potassium argentocyanide $(AgNO _3+ \text { excess of KCN})$

Show answer
Correct Option: A,D
Explanation:

The following are true about silver plating.
The process of depositing a thin layer of silver electrolytically on metal surface is called silver plating.
The article to be silver plated is made the cathode.
Anode consists of pure silver.
The bath contains a solution of potassium argentocyanide $(AgNO _3+ \text { excess of KCN})$

Match List - I (Position of the Metal in the Activity Series) with the List - II (Related Reduction Process) and select the correct option using the codes given below.

List - I(Position of the Metal in the Activity Series) List - II(Related Reduction Process)
(A) The bottom of the series (I) Electrolysis
(B) The top of the series (II) Reduction by heat alone
(C) The lower regions of the series (III) Found in native state
(D) The middle of the series (IV) Reduction using carbon or some other reducing agent
chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. $A - II, B - III, C - IV, D - I$

  2. $A - II, B - I, C - IV, D - III$

  3. $A - III, B - I, C - II, D - IV$

  4. $A - III, B - I, C - IV, D - II$

Show answer
Correct Option: C
Explanation:

The metals which are placed high in the reactivity series are obtained by electrolysis, middle metals by reduction using carbon, lower by heating alone and metals at bottom of the series are found in native state.

Generally ornaments are usually made up of 24 karat gold.

chemistry materials: metals and non-metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. True

  2. False

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Correct Option: B
Explanation:

Ornaments and jewellry can't be made of 100 per cent pure gold or 24 Karat gold as it is very soft and delicate. Most of jewellry are made of 22 karat to 10 karat of gold.


24 carat is pure gold so it has less strength to make ornaments. To impart strength, some impurities are mixed such as copper to make the 22 carat gold which is suitable for making ornaments. Therefore, 24 carat gold is pure gold , it is weak to make ornaments.

Non-metals have many different colours.

chemistry materials: metals and non-metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. True

  2. False

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Correct Option: A
Explanation:

Non-metals like phosphorous exist in various colors such as white, scarlet, yellow, red, violet, black. Similarly, sulfur is pale yellow, bromine is red-brown colored in liquid and vapor state.
Thus option $A$ is correct.

Non-metals are less dense and have low melting and boiling points as compared to metals.

chemistry materials: metals and non-metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. True

  2. False

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Correct Option: A
Explanation:

The melting point of an element is the temperature at which it converts from solid form to a liquid. In metals, there are two types of bonding that lead to higher melting points: covalent and metallic. Covalent bonds are when electron pairs are shared equally between atoms, and they pull atoms even closer together if multiple pairs of electrons are involved. Metallic bonds involve electrons that are delocalized: they float between many atoms, not just two, and positively charged nuclei are firmly bound to the surrounding "sea" of electrons. As strong bonds between atoms give elements higher melting points, it is also true that lower melting points are a result of weaker bonds or a lack of bonds between atoms. Therefore non-metals lack metallic bonding between atoms therefore have lower melting and boiling point than metals.
Also the closed and dense packing of metals in the lattice impart them high density and strength that lacks in non-metals.
Thus option A is true.

Metals are lustrous.

chemistry materials: metals and non-metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Metals are lustrous because of the free electrons present in them. The free electrons can move freely in the metal causing any light incident on them to get reflected back. This reflection is specular reflection rather than diffused and thus the metal surface appears shiny or lustrous.
Hence, option $A$ is correct.