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 physical property of beryllium makes it perfect aerospace material?

  1. High thermal conductivity

  2. Low density
  3. Both $A$ and $B$

  4. Beryllium is not suitable for aerospace mateerial
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It should be light to make aerospace material. Beryllium has low density and also has high thermal conductivity.

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 metal is famous with magicians for its melting properties?

  1. Tellurium

  2. Gallium

  3. Dysprosium

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

Gallium is a metal with lowest melting point. When we hold it and apply pressure with fingers, It melts at room temperature because of low melting point so, it is used by magicians.

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

Non-metals don't show malleability because of:

  1. lesser extent of bonding than metals.

  2. low density

  3. smaller atomic size

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The basic difference between metals and non-metals is the extent of bonding.Metals have very high extent of bonding than that in non-metals which makes the metal malleable.

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

Non-metals are non-malleable due to absence of:

  1. covalent bonding

  2. ionic bonding

  3. metallic bonding

  4. co-ordinate bonding
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Malleability in metals occurs because of the metallic bonds that keep the atoms in place. Metallic bonds, characterized by a 'sea' of electrons that easily move from atom to another, allow the metal atoms to slide past each other if a force is applied. Non-metals are hard and brittle due to the absence of these electron pools of metallic bonds. 


Hence, the correct option is $\text{C}$

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

Carbon foils can not be made because of the reason that:

  1. no-metallic bonding to allow one electron slip over another

  2. do not deform on hammering

  3. both of these

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon is a non-malleable element. Malleability is a physical property of matter, usually metals to bend or be hammered into other shapes without breaking. Carbon do not deform due to absence of the  metallic bonds which is required to be malleable as it keep the atoms in place and allows one electron slip over another. 

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

Potassium on exposure to air gives:

  1. Potassium peroxide

  2. Potassium superoxide

  3. Potassium dioxide

  4. Potassium oxide
Reveal answer Fill a bubble to check yourself
A,B,D Correct answer
Explanation

Potassium is an extremely active metal that reacts violently with oxygen in air. Potassium oxidizes faster than most metals and forms oxides with oxygen-oxygen bonds. Three species are formed during the reaction: potassium oxide, potassium peroxide, and potassium superoxide.

$8K + 4O _2 \rightarrow 2K _2O + 2KO _2 + K _2O _2$