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प्रश्न
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
पर्याय
Right
Wrong
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उत्तर
In the electrolytic reduction of alumina, the lining of graphite acts as an anode- 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.
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
Give the name and chemical formula of one ore of copper.
Name two metals which occur in nature in free state as well as in combined state.
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) copper
Zinc blende ore can be converted into zinc oxide by the process of:
(a) roasting
(b) hydrogenation
(c) chlorination
(d) calcination
Give reasons, why aluminum is used in:
wrapping chocolates
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?
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________
Usually ______ ores are subjected to ______ which is done in the absence of air.
Iron is _______.
Extraction of moderately reactive elements is done by _______ and _______ method.
Write the molecular formulae of the following compound.
Fluorspar
Explain concept with example/explain with the help of a balanced equation.
Calcination
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
