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प्रश्न
Mercury, silver, gold are highly reactive metals.
विकल्प
Right
Wrong
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उत्तर
Mercury, silver, gold are highly reactive metals- Wrong
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संबंधित प्रश्न
Name the gas in air which tarnishes silver articles slowly.
Name one metal which is extracted by reduction with aluminium.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
Aluminum is used in thermite welding:
what is thermit?
Give the chemical formula of :
Bauxite
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
Explain the following:
Galvanization protects iron from rusting.
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
_______ is the least reactive metal.
Write the name.
The process of strong heating of carbonate ores in insufficient air–
Explain the concept of Roasting.
Explain concept with example/explain with the help of a balanced equation.
Roasting
Explain Bayer’s process of concentration of bauxite with a chemical equation.
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
