Tag: general characteristics and uses of metals

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Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Which of the following statement is correct?

  1. All metals are ductile.

  2. All non-metals are ductile.

  3. Generally, metals are ductile.

  4. Some non-metals are ductile.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Metals are generally malleable — that is, they can be hammered or pressed permanently out of shape without breaking or cracking — as well as fusible (able to be fused or melted) and ductile (able to be drawn out into a thin wire). 


Typically they are malleable and ductile, deforming under stress without cleaving. There are metals which are not ductile. 
For example sodium and mercury.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

The high density of most of the metals is due to the_________.

  1. loosely packed crystal lattice of the metallic structure

  2. weak metallic bonding

  3. tightly packed crystal lattice of the metallic structure

  4. strong ionic bonding
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The high density of most metals is due to the tightly packed crystal lattice of the metallic structure.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

The alkali and alkaline earth metals in groups $I :A$ and $II :A$ are referred to as the light metals because, they have:

  1. low density.

  2. low hardness.

  3. low melting points.

  4. all of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 The alkali and alkaline earth metals in groups $I :A$ and $II :A$ are referred to as the light metals because they have low density, low hardness, and low melting points.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

The most durable metal plating on iron to protect against corrosion is :

  1. Tin plating

  2. Zinc plating

  3. Copper plating

  4. Nickel plating
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Galvanisation is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc. Hence, zinc plating is the most durable metal plating on iron to protect against corrosion.

Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Based on the information in each choice below, which of the noble gases would have the greatest density for a $1.00\ L$ sample at room temperature and pressure?

  1. Krypton molar mass $83.8 g/mol$, atomic radius $111$ picometers
  2. Argon molar mass $39.9 g/mol$, atomic radius $94$ picometers
  3. Neon molar mass $20.2 g/mol$, atomic radius $70$ picometers
  4. Helium molar mass $4.0 g/mol$, atomic radius $50$ picometers
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ans : A Krypton molar mass $83.3\ g/ mol$, atomic radius III picometers.

Note: [ As we go top to bottom, Atomic mass increases. This is because the $e^{\ominus}$ in bigger noble gases are located away from the nucleus and held less tightly by the atom. Therefore the density of krypton is more then $He, Ne$ and $Ar$].