Tag: physical properties of metals and non-metals
Questions Related to physical properties of metals and non-metals
Most of the metals:
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are hard
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have lustre
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are good conductors of electricity
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all of the above
- Lustrous (shiny)
- Hard
- High density (are heavy for their size)
- High tensile strength (resist being stretched)
- High melting and boiling points.
- Good conductors of heat and electricity. It can be followed that all of the above are correct
A metal which can be cut with a knife is:
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iron
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sodium
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copper
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zinc
Sodium and Potassium metals are the two metals which are soft and can be cut with a knife.
Why are metals solid in state?
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The atoms are attached by weak van der waals forces
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They gain electrons very easily
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They have a high boiling point
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They have a high intermolecular forces
Most metals are solids because the intermolecular forces between the atoms of metals are quite large. This reduces the interstitial space and so they acquire a definite shape. Room temperature is not enough to provide them required kinetic energy to overcome their forces of attraction or convert its state. Thus, they remain solid at room temperature.
Greyish white metal which is a good conductor of electricity and heat , has a boiling point of $920^\circ C$ is :
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aluminium.
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tin.
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iron.
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zinc.
Greyish white metal which is a good conductor of electricity and heat and has a boiling point of $920^\circ C$ is zinc.
Hence, the correct option is $D$.
Zinc has a melting point of :
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$233^\circ C$
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$219^\circ C$
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$333^\circ C$
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$419^\circ C$
The metal Zinc has a melting point of $419^\circ C$.
A bar of zinc generates a characteristic sound when bent, similar to_________.
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Tin cry
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Water splashing
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Glass breaking
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None of above
A bar of zinc generates a characteristic sound when bent, similar to tin cry. A tin cry is the characteristic sound heard when a bar of tin is bent. Variously described as a "screaming" or "crackling" sound, the effect is caused by the crystal twinning in the metal.
Platinum metal can be dissolved in:
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hot conc. HCl
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hot conc. $HNO _3$
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hot dil. $H _2SO _4$
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a mixture of conc. HCl and $HNO _3$
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Traditional aqua regia is a mixture of concentrated nitric and hydrochloric acids in a ratio of 1:3 that can dissolve noble metals such as gold, platinum and palladium, even though the metals are not soluble in either acid alone.
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Hence option D is correct answer.
The most reactive metal among the following is:
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Fe
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Pt
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Ni
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Co
Arrange $Si, Be, Mg, Na$ and $P$ in the increasing order of metallic character:
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$P<Be<Si<Mg<Na$
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$P<Si<Be<Mg<Na$
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$Si<P<Mg<Na<Be$
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$Na<Mg<Be<Si<P$
metallic character increases down the group and decreases along the period as we move left to right. Hence the order of increasing metallic character is
In vapour state a metal is mono atomic.
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True
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False
There are no definitive chemical bonds between two metal atoms in a lattice. They all are held together by the so-called metallic bond. The valence electrons are not shared between metal atoms. Hence they exist as a single metal atom in their lattice unit.