Tag: metals

Questions Related to metals

Which of the following is the densest metal on earth?

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

  1. Rhenium

  2. Osmium

  3. Rhodium

  4. Iridium

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Correct Option: B
Explanation:

The densest chemical element is osmium(which is a metal). Osmium has a density of around 22 grams per cubic centimeter, about twice the density of lead.

Which of the following physical property of beryllium makes it perfect aerospace material?

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

  1. High thermal conductivity

  2. Low density

  3. Both $A$ and $B$

  4. Beryllium is not suitable for aerospace mateerial

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Correct Option: C
Explanation:

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

Which of the following metal is famous with magicians for its melting properties?

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

  1. Tellurium

  2. Gallium

  3. Dysprosium

  4. Rhodium

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Correct Option: B
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.

Non-metals don't show malleability because of:

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

  1. lesser extent of bonding than metals.

  2. low density

  3. smaller atomic size

  4. none

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Correct Option: A
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.

Metal that matches non-metals in exhibiting malleability is: 

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

  1. zinc

  2. iron

  3. copper

  4. gold

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Correct Option: A
Explanation:

Like non-metals, zinc is an exception among metals that does not shows malleability.

The properties that is NOT possessed by non-metals are:

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

  1. Brittleness

  2. Non- conductivity

  3. Malleability

  4. Low density

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Correct Option: C
Explanation:

Malleability is the property of metal whereas non-metals are generally brittle,non conducting and have low density.

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

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

  1. covalent bonding

  2. ionic bonding

  3. metallic bonding

  4. co-ordinate bonding

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Correct Option: C
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 $\text{C}$

Which of the following element is non-malleable?

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

  1. $Al$

  2. $Ag$

  3. $Au$

  4. $C$

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Correct Option: D
Explanation:

Metals are malleable. In given options, carbon is non-metal and thus is hard and non-malleable. 

Hence, the correct option is $D$

Oxidation of sodium gives:

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

  1. sodium oxide

  2. sodium dioxide

  3. sodium peroxide

  4. no oxide is formed

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Correct Option: A,C
Explanation:

Oxidation of sodium gives sodium oxide, $Na _2O$ and about 20% sodium peroxide,$Na _2O _2$.

$6 Na + 2 O _2 \rightarrow 2 Na _2O + Na _2O _2$

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

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

  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

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Correct Option: C
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.