Q24 of 31 Page 198

Aluminium does not react with water at room temperature but reacts with both dil. HCl and NaOH solution. Verify these statements experimentally. Write your observation with chemical equations. From these observations, can we conclude that A / is a metalloid?

Aluminum with water:


Aluminum does not get affected by water and does not react with it.


Aluminum with dil.HCl


When aluminium is dissolved with hydrochloric acid (HCl), it gives aluminum chloride and hydrogen gas.


2Al + 6HCl → 2AlCl3 + 3H2


Aluminum with NaOH


When aluminum is treated with NaOH, i.e., a base, it gives sodium aluminate and hydrogen gas.


2Al + 2NaOH → 2NaAlO2 + H2


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22

An element X belongs to 3rd period and group 2 of the periodic table. State

(a) The no. of valence electrons


(b) The valency


(c) Whether it is metal or a nonmetal.

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An element has atomic number 19. Where would you expect this element in the periodic table and why?

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Collect the information about reactivity of VIII A group elements (noble gases) from intend or from your school library and prepare a report on their special character when compared to other elements of periodic table.

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Collect information regarding metallic character of elements of 1A group and prepare report to support the idea of metallic character increases in a group as we move from top to bottom.