Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
4.8k views
in Chemistry by (76.1k points)

A white substance A reacts with dilute H2SO4 to produce a colourless gas B and a colourless solution C. The reaction between B and acidified K2 Cr2 O7 solution produces a green solution and a slightly coloured participate D. The substance D burns in air to produce a gas E which reacts with B to yield D and a colourless liquid. Anhydrous copper sulphate is turned blue on addition of this colourless liquid. Addition of aqueous NH3 or NaOH to C produces first a participate which dissolves in the excess of the respective reagent to produce a clear solution in each case. Identify A, B, C, D and E. Write the equation of the reactions involved. 

1 Answer

+1 vote
by (74.3k points)
selected by
 
Best answer

The above set leads to following conclusions.

(i) Because Gas (B) is colourless and turns acidified K2 Cr2 O7 solution green, it appers to be H2 S. 

(ii) H2 S gas is obtained by the reaction of dil. H2 SO4 on A, thus A must be a sulphide. 

(iii) Zns sulphide is white thus it indicates that A is ZnS

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.

Categories

...