we add dilute sulphuric acid or dilute hydrochloric acid , in reaction with zinc granuoles . why don't we add only sulphuric acid or hydrochloric acid , instead of dilute sulphuric acid or dilute hydrochloric acid

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Write word equations and then balanced equations for the reaction taking

place when −

(a) dilute sulphuric acid reacts with zinc granules.

(b) dilute hydrochloric acid reacts with magnesium ribbon.

(d) dilute hydrochloric acid reacts with iron filings.

Give reason for the following :

(a) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

(b) Potassium and sodium are not used fro reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

Give a chemical test to distinguish between :

(a) dilute sulphuric acid and dilute hydrochloric acid,

(b) dilute sulphuric acid and conc. sulphuric acid.

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