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प्रश्न
Name a metal which occurs free in nature.
उत्तर
Gold
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संबंधित प्रश्न
Choose the correct answer from the options given below:
Aluminum powder is used in thermite welding because
A. It is a strong reducing agent
B. It is a strong oxidizing agent
C. It is corrosion resistant
D. It is a good conductor of heat
The most common ore of iron is ________. (Calcium / Haematite)
Name an ore of zinc.
Explain the following:
Zinc is used to cover iron so as to prevent rusting of iron. Why?
Give composition and uses of the following alloys. Mention the reason for its use.
Bronze
Name an alloy of zinc which is used in simple voltaic cells.
What is an alloy? An alloy usually has some property which makes it useful in a specific way.
What is the special property of : type metal?
State the main components of the following alloy:
Duralumin
Which of the following statements are correct?
(i) A depressant prevents certain type of particle to come to the froth.
(ii) Copper matte contains \[\ce{Cu2S}\] and \[\ce{ZnS}\].
(iii) The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of \[\ce{SO2}\] during the extraction.
(iv) Zinc can be extracted by self-reduction.
The ore which can be concentrated by magnetic separation.
