PYQ Vault
EbooksTutor

Tests for sulphide and sulphite ions using acidified dichromate or lead acetate

This type of question, asked 4 times: 2021 Paper 25, 30 Jan 2023, 30 Jan 2024, 5 Apr 2026 S2. All 4 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2021 Paper 25

    43
    On treating a compound with warm dil. H2SO4H_{2}SO_{4}, gas XX is evolved which turns K2Cr2O7K_{2}Cr_{2}O_{7} paper acidified with dil. H2SO4H_{2}SO_{4} to a green compound YY. XX and YY respectively are :

    Tap an option to check your answer.

  2. Question 2

    30 Jan 2023

    38
    During the qualitative analysis of SO32−SO_{3}^{2 -} using dilute H2SO4,SO2H_{2}SO_{4},SO_{2} gas is evolved which turns K2Cr2O7K_{2}Cr_{2}O_{7} solution (acidified with dilute H2SO4H_{2}SO_{4} ):

    Tap an option to check your answer.

  3. Question 3

    30 Jan 2024

    31
    Given below are two statements: Statement-I: The gas liberated on warming a salt with dil H2SO4H_{2}SO_{4}, turns a piece of paper dipped in lead acetate into black, it is a confirmatory test for sulphide ion. Statement-II: In statement-I the colour of paper turns black because of formation of lead sulphite. In the light of the above statements, choose the most appropriate answer from the options given below:

    Tap an option to check your answer.

  4. Question 4

    5 Apr 2026 S2

    45
    A paper dipped in a dil. H2SO4H_{2}SO_{4} solution of ' X ' upon treatment with SO2SO_{2} gas turns into green. The compound ' X ' is :

    Tap an option to check your answer.