How will you distinguish between conc. HCl and conc. H_2SO_4? - Vidyadip

Question

How will you distinguish between conc. HCl and conc. $H_2SO_4?$

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Answer

Conc. HCl and Conc. $H_2SO_4:$

S.No.	Conc. HCl	Conc. $H_2SO_4$
1.	Addition to silver nitrate : When conc. HCI is added to silver nitrate white ppt. of silver chloride are formed. $AgNO _3+ HCl \longrightarrow AgCl + HNO _3$ White ppt. of silver chloride dissolve in excess of ammonium hydroxide.	Addition to copper : Conc. Sulphuric acid is added to copper and heated. Sulphur dioxide, which is colourless gas with the smell of burnt sulphur is evolved. $ Cu +2 H _2 SO _4 \longrightarrow CuSO _4+2 H _2 O + SO _2 $ $SO _2$ gas turns $K _2 Cr _2 O _7$ paper green.
2.	A glass rod dipped in conc. HCl is brought in contact with ammonia gas, curdy white fumes of ammonium chloride is seen around the glass rod.	Glucose when conc. Sulphuric acid $\underset{\text { blue }}{ CuSO _4 \cdot 5 H _2 O } \xrightarrow{\text { conc } \cdot H _2 SO _4} CuSO _4+\underset{\text { white }}{5 H _2 O }$

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