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Solution


Q.

Given below are two statements:

Statement - I : Along the period, the chemical reactivity of the elements gradually increases from group 1 to group 18.

Statement - II : The nature of oxides formed by group 1 elements is basic while that of group 17 elements is acidic.

In the light of the above statements, choose the most appropriate from the options given below:                 [2024]
1 Both Statement I and Statement II are True  
2 Statement I is True but Statement II is False  
3 Statement I is False but statement II is true  
4 Both Statement I and Statement II are False  

Ans.

(3)

Statement (I): Chemical reactivity decreases across a period from left to right. Group 18 elements are inert.

Statement (II): Metals (group 1 elements) form basic oxides (dissolve in water to form base) e.g. Li2O,Na2O etc. Non metals (group 17 elements) form acidic oxides (dissolve in water to form acids) e.g. Cl2O7,I2O5, etc.