Tag: physical properties of metals and non-metals

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

Metals have:

  1. high melting and boiling point

  2. low melting and boiling point

  3. high melting and low boiling point

  4. low melting and high boiling point
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

1) High melting and boiling point

2) Metallic bonding is the strong attraction between closely packed positive metal ions and a 'sea' of delocalised electrons.

3) The attraction between the metal ions and the delocalised electrons must be overcome to melt or to boil a metal.

4) These attractive forces are strong, so metals have high melting and boiling points.

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

Sodium and potassium  are soft even after being metals because of:

  1. strong intermolecular forces

  2. weak cohesive forces

  3. high melting point

  4. low boiling point
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hardness of a metal is determined by the strong cohesive forces between the atoms. The cohesive forces between atoms of these metals are very weak. The bonding in these metals is weak and electrons are not located over a single atom but over a number of atoms. The weak bonding results in softness of metal.

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

A metal which is lighter than water is:

  1. lithium

  2. gold

  3. silver

  4. iron
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Lithium has a density of (0.534 g/cm3) which is lower than water (1 g/cm$^3$). Two other metallic elements are less dense than water. Potassium has a density of 0.862 g/cm$^3$ while sodium has a density of 0.971 g/cm$^3$. All of the other metals on the periodic table are denser than water. While lithium, potassium, and sodium are all light enough to float on water, they are also highly reactive.
Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

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

  1. electropositive

  2. electronegative

  3. depends on temperature

  4. depends on impurities in the metal
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Highly electropositive metals (like alkali and alkaline earth metals) have very negative standard reduction potentials, making them difficult to reduce by chemical means. Electrolysis of their fused salts is the standard industrial method for their extraction.

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

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?

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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.

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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.

  1. carbon monooxide

  2. carbon dioxide

  3. carbon

  4. charcoal
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. 20

  2. 40

  3. 60

  4. 80
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  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.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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?

  1. Metal

  2. Non-Metal

  3. Metalloid

  4. Semi-conductor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metal

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