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प्रश्न
Give reason for the following:
Rusting reduces the structural strength of iron.
उत्तर
Rusting corrodes iron and hence reduces its structural strength.
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संबंधित प्रश्न
Choose the most appropriate answer of the following:
This is not an alloy of copper:
(A) Brass
(B) Bronze
(C) Solder
(D) Duralumin.
Name one metal which has a low melting point.
Name the non-metal which is used as a rocket fuel (in liquid form).
Name one property which is characteristic of non-metals.
Which of the following are amphoteric oxides:
MgO, ZnO, P2O3, Al2O3, NO2
State one use of Carbon (as Graphite).
Define non-metals. Give five examples of non-metals.
(a) Give the names and formulae of one metal chloride and one non-metal chloride.
(b) State an important property in which these metal chloride and non-metal chloride differ.
(c) Why do they differ in this property?
Name a metal used as a thermometric liquid
Write ‘True’ or ‘False’ in front of following statement.
Graphite is used in making filaments of electric bulb.
Name a metal which is lighter than water :
Name a non-metal which is good conductor of electricity.
Name the non-metal present in abundance in the earth's crust.
Name:
a metal with dull appearance
Give the balanced reactions for the following:
Sodium is dropped in water
How many valence electrons are present in:
(i) metals and
Explain the term Minerals.
Name a non-metal which can form a positive ion.
Give reason for the following:
Metals form cations while non-metals form anions.
