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प्रश्न
Write the molecular formulae of the following compound.
Fluorspar
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उत्तर
Fluorspar- CaF2
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संबंधित प्रश्न
Name the following:
Main ore of aluminium.
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
Bronze is an alloy of copper and ______.
How is zinc extracted from its carbonate ore (calamine)? Explain with equations.
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
- What are A and B?
- Identify C and D.
- What will be the action of C on litmus solution? Why?
- State whether element B is a solid, liquid or gas at room temperature.
- Write formula of the compound formed when element B reacts with an element E having atomic number 5.
Which metal can be extracted from the following ore?
Haematite
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?
Compare the process of calcination and roasting.
What is meant by refining of metals? Name the three common methods used for refining.
Name : The metal which is liquid at room temperature.
Which one of the following is not true of metal :
Metals are malleable and ductile
Froth floatation process is generally used to concentrate ______ ores.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
Care must be taken while diluting concentrated nitric acid with water. Why?
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.
