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प्रश्न
Mercury, silver, gold are highly reactive metals.
पर्याय
Right
Wrong
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उत्तर
Mercury, silver, gold are highly reactive metals- Wrong
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संबंधित प्रश्न
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
Write the composition of the alloy called bronze.
Name one metal which is extracted by:
Electrolytic reduction.
Name the method by which aluminium metal is extracted.
How is zinc extracted from its carbonate ore (calamine)? Explain with equations.
How is aluminium metal extracted? Explain with the help of an equation.
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
Aluminum is used in thermite welding:
write reaction for process?
An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
What is meant by concentration of ores?
Compare the process of calcination and roasting.
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 process used for the enrichment of sulphide ore.
Gold and silver are active metals.
Explain Bayer’s process.
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Which of the following ore is concentrated by the Froth floatation process?
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
