Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Practical Chemistry

NTA Abhyas 2020 · Chemistry · Practical Chemistry

A red solid is insoluble in water. However, it becomes soluble if...

A red solid is insoluble in water. However, it becomes soluble if some KIKI is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is

Options

  1. AHgI2Hg{I}_{2}
  2. BHgOHgO
  3. CPb3O4P{b}_{3}{O}_{4}
  4. D(NH4)2Cr2O7{\left(N{H}_{4}\right)}_{2}C{r}_{2}{O}_{7}

Correct answer

A. HgI2Hg{I}_{2}

Step-by-step solution

HgI2Hg{I}_{2} is orange-red in appearance and hardly soluble in water. It dissolves in excess of I−I^{-} giving complexes HgI3−Hg{I}_{3}^{-} and HgI42−Hg{I}_{4}^{2 -}. Violet fumes are liberated due to the release of Iodine gas upon heating.
Practice Practical Chemistry on Quantrex Academy →

More from Practical Chemistry

Passage: Consider the following reaction sequence in which J , K , L and M are the major… JEE Advanced 2026Among Fe^ 3+ , Pb^ 2+ , Cu^ 2+ and Mn^ 2+ , identify the one that gets precipitated out… JEE Main 2026Among Fe^ 2+ , Fe^ 3+ , Cr^ 2+ and Zn^ 2+ , the ion that shows positive borax bead test… JEE Main 2026A salt with few drops of conc. HCl gives apple green colour in flame test. The group… JEE Main 2026A student has been given 0.314 g of an organic compound and asked to estimate Sulphur.… JEE Main 2026In the Group analysis of cations, Ba^ 2+ ~\&~ Ca^ 2+ are precipitated respectively as JEE Main 2026Consider three metal chlorides x, y and z, where x is water soluble at room temperature… JEE Main 2026By usual analysis, 1.00 g of compound (X) gave 1.79 g of magnesium pyrophosphate. The… JEE Main 2026 Full Practical Chemistry list All NTA Abhyas JEE Main PYQs