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Solved Examples on s-Block Elements:

Question.1 The compound(s) formed upon combustion of sodium metal in excess air is (are) [IIT JEE ]

a) Na2O2

b) Na2O

c) NaO2

d) NaOH

Answer: a & b.

Solution:  Na burns in oxygen to form sodium oxide (Na2O) which further absorbs oxygen to form sodium peroxide (Na2O2). So, Na2O and Na2O2 are formed when Na metals burns in excess of oxygen.

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Question.2  STATEMENT-1: Alkali metals dissolves in liquid ammonia to give blue solution because  

 STATEMENT-2: Alkali metals in liquid ammonia give solvated species of the type [M(NH3)n]+ (M = alkali metals).  [IIT JEE ]

a) Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1

b) Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1

c) Statement-1 is True, Statement-2 is False

d) Statement-1 is False, Statement-2 is True

Answer:  b

Solution: Alkali metals dissolves in liquid ammonia to give solvated complex ion  [M(NH3)n]+  and  solvated electrons. The solvated electrons provide deep blue colour to the solution.

Hence, the correct option is b.

Question. 3 The set of representing the correct order of first ionization potential is [IIT JEE]

a) K > Na  > Li

b) Be > Mg > Ca

c) B > C > N

d) Ge > Si > C

Answer: ...

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