Chemistry
State a specific reason for using –
(a) steel in automobiles
(b) gold in jewellery
(c) copper in electrical cables
(d) zinc in galvanizing
(e) lead in bullets
(f) magnesium in fireworks.
Metals & Non-Metals
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Answer
(a) Steel in automobiles — It is malleable with high tensile strength.
(b) Gold in jewellery — It is expensive, lustrous, malleable and ductile.
(c) Copper in electrical cables — It is a good conductor of electricity.
(d) Zinc in galvanizing — It prevents rusting.
(e) Lead in bullets — It has high specific gravity.
(f) Magnesium in fireworks — It burns with a dazzling light.
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Related Questions
State why galvanization, tinning and chromeplating are used as three different processes for coating specific articles for prevention of rusting.
Give a reason why –
(a) rust turns moist red litmus blue
(b) a green deposit is seen on the surface of an article of copper
(c) iron objects rust easily but the iron pillar at Qutab Minar has not rusted over the years.
Complete the statements given below, by filling in the blank with the correct word/s:
The ability of a metal to produce a resonant sound …………… [ductility/sonority/malleability].
A metal which floats on water …………… [zinc/potassium/magnesium].
A non-metal that leaves a mark on paper …………… [phosphorous/graphite/sulphur].
A non-metal which allows an electric current to pass through it …………… [graphite/sulphur/iodine].
A non-metal added to swimming pools to kill germs …………… [nitrogen/chlorine/oxygen].
Give reasons for the following:
Metals form cations while non-metals form anions.
Potassium reacts vigorously with cold water while copper does not react with water or steam.
Rusting reduces the structural strength of iron.
A suspension of rust is basic in nature.
Galvanized steel is not used for articles used for edible applications.