Tag: metals

Questions Related to metals

Generally, non-metals are not lustrous. Which of the following non-metal is lustrous?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Sulphur

  2. Oxygen

  3. Nitrogen

  4. Iodine

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Correct Option: D
Explanation:

Lustre means shine. Shining metals are also called lustrous metal. For example, gold. Non-metals such as sulphur, oxygen, nitrogen are non-lustrous but iodine is a greyish black solid and crystals have a metallic lustre.

Non metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

The allotropic form of a non-metal, which is a good conductor of electricity is: 

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Graphite

  2. Diamond

  3. Rhombic sulphur

  4. None of these

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Correct Option: A
Explanation:

Graphite, which is an allotrope of carbon, is a good conductor of electricity.

Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Iron nail

  2. Aluminium wire

  3. Copper plate

  4. Piece of coal

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Correct Option: D
Explanation:

All are metals in the given options iron, aluminium and copper but only carbon is a nonmetal present which is breakable with a hammer.

Which of the following are uses of sulphur?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Sulphur is used in preparation of conducting wires

  2. A mixture of zinc and sulphur on heating with sulphur produces a greyish residue of zinc sulphide

  3. Sulphur is an element belonging to VI A group

  4. Sulphur is a nonmetallic element.

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Correct Option: B,C,D
Explanation:

Zinc on heating with sulphur produces a greyish residue of zinc sulphide.
Sulphur is an element belonging to VI A group.
Sulphur is a nonmetallic element.

Diamond and graphite are good conductors of electricity.

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. True

  2. False

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Correct Option: B
Explanation:

Graphite is able to conduct electricity, due to delocalization of the pi bond electrons above and below the planes of the carbon atoms. These electrons are free to move, so are able to conduct electricity.
In diamond, all four outer electrons of each carbon atom are 'localized' between the atoms in covalent bonding. The movement of electrons is restricted and diamond does not conduct an electric current.
Thus, graphite is a good conductor and diamond is not. 
Option "B" is correct.

Which of the following is a good conductor of electricity?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Diamond

  2. Graphite

  3. Both A and B

  4. None of the above

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Correct Option: B
Explanation:

Diamond and graphite are allotropes of carbon. Graphite has carbon molecules held together by weak van der Waal's forces of attraction and they have loosely bound electrons which are responsible for conducting electricity, while diamond is the hardest and strongest material in which all the molecules are bound by strong bonding between carbon tetrahedrons held by strong forces of attraction and so, they do not have free or loosely bound electrons to conduct electricity.

Which of the following does not conduct electricity in its molten state?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Iron

  2. Magnesium oxide

  3. Lithium fluoride

  4. Sulphur

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Correct Option: D
Explanation:

Sulphur is a non-metal so it does not conduct electricity. Iron is a metal so it conducts electricity Magnesium oxide and Lithium fluoride are ionic compounds that contains ions which conducts electricity in molten state.

Which of the following when stretched, break into pieces?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Calcium

  2. Phosphorus

  3. Iron

  4. Radium

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Correct Option: B
Explanation:

When sulphur or phosphorus is stretched, they break into pieces. Non metals are non-malleable non-ductile.

Which one is the softest solid non-metal among the following?
Diamond, Oxygen, Sulphur, Bromine

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. Diamond

  2. Oxygen

  3. Sulphur

  4. Bromine

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Correct Option: C
Explanation:

Most of the solid non-metals are quite soft. For example - sulphur and phosphorous are solid non-metals which are quite soft.

Which characteristics are required for a element to behave as electrical conductor?

chemistry metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

  1. It should have valence electron

  2. It should have free electron

  3. It easily provide electron to other element

  4. Both $B$ and $C$

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Correct Option: D
Explanation:

Electrical conductors elements have free electrons, which they can easily provide to conduct electricity. This characteristics are generally available in metals.