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Classification Of Elements And Periodicity In Properties

Question
CBSEENCH11005546
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Show by a chemical reaction with water that Na2O is a basic oxide and Cl2O7 is an acidic oxide. 

Solution
Na2O reacts with water to form sodium oxide which turns red litmus blue.
space space stack Na subscript 2 straight O with Sodium space oxide below space plus space straight H subscript 2 straight O space space space rightwards arrow space space space space NaOH
Therefore, Na2O is a basic oxide.
In contrast, Cl2O7 reacts with water to form perchloric acid which turns blue litmus red.
space space Cl subscript 2 straight O subscript 7 plus straight H subscript 2 straight O space rightwards arrow space stack 2 HClO subscript 4 with Perchloric space acid below
Hence, Cl2O7 is an acidic oxide. 

Some More Questions From Classification of Elements and Periodicity in Properties Chapter

Which property is the basis of long form of periodic table?

How many elements are placed in each period of the p-block?

What is the number of groups in: (i) p-block  (ii) d-block?

How many elements are present in:
(i) second period    
(ii) fourth period    
(iii) sixth period?

What is the name given to the s-block elements?

To which block the element with outer electronic configuration 4s23d10 belongs?

Why are there 10 elements in each series of d-block?

In terms of electronic configuration,
what is common in a given period and group?

Give the general electronic configuration of
(i) Transition elements     (ii) Inner transition elements.

Name the group and period to which an element with Z = 15 belongs ?

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