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प्रश्न
Name two metals which occur in nature in free state as well as in combined state.
उत्तर
Copper and silver metals occur in nature in free as well as combined state.
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संबंधित प्रश्न
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Give reasons, why aluminum is used in:
In making ships
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass
Name the methods by which concentrated ore is converted to metallic oxide.
What is the difference between calcination and roasting?
Gold and silver are active metals.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
In thermite welding a mixture of ____________ is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
