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प्रश्न
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
उत्तर
Sodium, potassium, calcium and magnesium are most reactive metals (placed at the top in the reactivity series). Due to their high reactivities, they are never found as free elements. They are always found in combined form.
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संबंधित प्रश्न
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Name one metal which is extracted by reduction with carbon.
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
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?
How many valence electrons are present in metals ?
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
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 _________
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
