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Solution


Q.

Read the passage carefully and answer the following questions from (i) to (v):

 

During a chemical reaction, it is possible that one element takes the place of another element in a compound. Such reactions are called displacement reactions. Precisely, an element that is high in the Reactivity series displaces an element that is lower in the reactivity series. In single displacement reactions, only one element displaces the other element from its compound. The displacement reaction between iron(III) oxide and powdered aluminum produces so much heat that iron gets into its molten state

 

(v) Which is the correct observation for the reaction between granulated zinc and dilute hydrochloric acid
1 The reaction mixture turns milky.  
2 Greenish-yellow gas is evolved.  
3 The colourless and odourless gas evolves with a pop sound.  
4 The surface of the metal turns shining.  

Ans.

(3)

colourless and odourless gas evolves with a pop sound