JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

Choose the correct colour of the product for the following reaction.

An indicator ‘X’ is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with \( \mathrm{H_2O_2} \) at room temp. The indicator ‘X’ forms blue coloured complex with compound ‘A’ present in the solution. The indictor ‘X’ and compound ‘A’ respectively are:

Formation of which complex, among the following, is not a confirmatory test of \( \mathrm{Pb^{2+}} \) ions

A chloride salt solution acidified with dil. \( \mathrm{HNO_3} \) gives a curdy white precipitate, \( [A] \), on addition of \( \mathrm{AgNO_3} \). \( [A] \) on treatment with \( \mathrm{NH_4OH} \) gives a clear solution, \( B \). \( A \) and \( B \) are respectively,

When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral \( \mathrm{FeCl_3} \), it gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains:

A solutions of \( \mathrm{Cr_2O_5} \) in amyl alcohol has a ____________ colour.

During the qualitative analysis of \( \mathrm{SO_3^{2-}} \) using dilute \( \mathrm{H_2SO_4} \), \( \mathrm{SO_2} \) gas is evolved which turns \( \mathrm{K_2Cr_2O_7} \) solution (acidified with dilute \( \mathrm{H_2SO_4} \)).

The complex that dissolves in water is:

Match the List-I with List-II.

Choose the correct answer from the options given below:

\( \mathrm{K_2Cr_2O_7} \) paper acidified with dilute \( \mathrm{H_2SO_4} \) turns green when exposed to:

In the wet tests for detection of various cations by precipitation, \( \mathrm{Ba^{2+}} \) cations are detected by obtaining precipitate of:

← PreviousQuestion 8 of 11Next →

JEE Main 2023 11th April Morning Shift

The complex that dissolves in water is: