Sarthaks Test
+1 vote
in Olympiad by (75.6k points)

Following experiments were carried out separately in chemistry laboratory in different test tubes, lebelled as (I),(II), (III), and (IV).

(I) Mg + dil. HCl

(II) Al + dil. H2SO4

(III) Cu + dil. HCl

(IV) Mn + dil. HNO3

She observed hydrogen gas is not produced in :

(a) Only Test tube (IV) 

(b) Both test tubes (III) and (IV)

(c) Only test tube (III) 

(d) Both test tubes (II) and (III)

Please log in or register to answer this question.

1 Answer

+1 vote
by (70.8k points)

Correct option: (c) Only test tube (III)


Cu + dil. HCl → No reaction

Copper does not liberate H2 from dilute hydro chloric acid because only those metals which are having standard reduction potentials lower than that of hydrogen react with non-oxidising agent like HCl and displaces hydrogen from them.

Copper has higher reduction potential than hydrogen.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.