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प्रश्न
Gold and silver are active metals.
विकल्प
Right
Wrong
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उत्तर
Gold and silver are active metals- Wrong
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संबंधित प्रश्न
Name two metals which occur in nature in free state as well as in combined state.
Define the term mineral.
How is aluminium metal extracted? Explain with the help of an equation.
Name the metal which is extracted from the ore called ‘rock salt’.
Aluminum is used in thermite welding:
what is thermit?
Aluminum is used in thermite welding:
write reaction for process?
Give the chemical formula of :
Cryolite
Name the following:
The mixture of materials fed into a furnace to extract a metal.
Name the following:
Name two metals always find in combined state.
What is meant by concentration of ores?
Which method of refining is used to get 99.8% pure aluminium?
Explain the following:
Galvanization protects iron from rusting.
Name a non- metal that has a metallic luster and sublimes on heating.
Name the methods by which concentrated ore is converted to metallic oxide.
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
Which of the following ore is concentrated by the Froth floatation process?
Electrical wires have a coating of an insulting material. The material, generally used is
