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Why are alkali metals not found in nature?       

Important Questions on The s-Block Elements

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Chemistry Part II Textbook for Class XI>Chapter 3 - The s-Block Elements>EXERCISES>Q 10.4
Find out the oxidation state of sodium in Na 2 O 2 .                 
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Chemistry Part II Textbook for Class XI>Chapter 3 - The s-Block Elements>EXERCISES>Q 10.5
Explain why is sodium less reactive than potassium?
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Chemistry Part II Textbook for Class XI>Chapter 3 - The s-Block Elements>EXERCISES>Q 10.6
Compare the alkali metals and alkaline earth metals with respect to ionization enthalpy, basicity of oxides and solubility of hydroxides.     
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Chemistry Part II Textbook for Class XI>Chapter 3 - The s-Block Elements>EXERCISES>Q 10.7
In what ways lithium shows similarities to magnesium in its chemical behaviour?        
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Chemistry Part II Textbook for Class XI>Chapter 3 - The s-Block Elements>EXERCISES>Q 10.8
Explain why alkali and alkaline earth metals cannot be obtained by chemical reduction methods ?         
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Chemistry Part II Textbook for Class XI>Chapter 3 - The s-Block Elements>EXERCISES>Q 10.9
Why are potassium and caesium, rather than lithium, used in photoelectric cells ?          
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Chemistry Part II Textbook for Class XI>Chapter 3 - The s-Block Elements>EXERCISES>Q 10.1
When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change.        
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Chemistry Part II Textbook for Class XI>Chapter 3 - The s-Block Elements>EXERCISES>Q 10.11
Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?