Tag: patterns and properties of metals

Quizzes (5) Questions (65)

Questions Related to patterns and properties of metals

Multiple choice aluminium patterns and properties of metals chemistry

Bauxite, diaspore and cryolite are the ore of the:

  1. aluminium

  2. zinc

  3. copper

  4. silver
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bauxite-$Al _2O _3$

Dispore- repeating units $AlO(OH)$
Cryolite- $Na _3AlF _6$
These are ores of aluminiunm.

Multiple choice aluminium patterns and properties of metals chemistry

Aluminium, deposited as vapour on a glass, forms good mirrors, essentially because:

  1. the coating is much smoother

  2. it does not scratch

  3. it has better shine than silver

  4. it does not tarnish in air
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aluminium, deposited as vapour on a glass, forms good mirrors because it does not tarnish in air. If it tarnishes then the mirror would not be that good. Hence due to the property of it not tarnishing in air the mirror formed are good mirrors.

Multiple choice aluminium patterns and properties of metals chemistry

Which of the following metal is protected by a layer of its own oxide?

  1. Silver

  2. Sodium

  3. Aluminium

  4. Iron
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aluminium is reactive and reacts spontaneously with water or air to form aluminium oxide $(Al _2O _3)$, forms a stable passive layer which protects aluminium from corrosion or further oxidation.

Multiple choice aluminium patterns and properties of metals chemistry

Crystalline metal can be transformed into metallic glass by :

  1. alloying

  2. pressing into thin plates

  3. slow cooling of molten metal

  4. very rapid cooling of molten metal
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Crystalline metal can be transformed into a metallic glass by very rapid colling of molten metal. On rapid cooling of molten metal gives amorphous solid which is nothing but metallic glass.
Hence option $D$ is correct.

Multiple choice aluminium patterns and properties of metals chemistry

Duralumin is a alloy. It does not contains:

  1. $Al$
  2. $Cu$
  3. $Mg$
  4. $Na$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Duralumin is an alloy of aluminium that has copper and contains small amounts of magnesium, manganese, iron, and silicon: its applications requiring lightness and strength, as in aeroplane construction.So sodium is not present in Duralumin.

Hence option $D$ is correct.