Tag: chemistry

Questions Related to chemistry

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

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

  1. low density.

  2. low hardness.

  3. low melting points.

  4. all of the above.

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Correct Option: D
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.

Which of the following element is sonorous?

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

  1. Hydrogen

  2. Sulphur

  3. Iron

  4. All of above

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Correct Option: C
Explanation:

Sonorous, i.e., making a sound when it is a property of the metal. Iron being a metal is sonorous whereas hydrogen and sulphur are non-metals.


So, the correct option is $C$

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

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

  1. Tin plating

  2. Zinc plating

  3. Copper plating

  4. Nickel plating

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Correct Option: B
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.

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?

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

  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

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Correct Option: A
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 $Ar$].

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.