A student strongly heats hydrated ferrous sulphate salt in a dry test-tube. He would observe a :
(1) yellow residue
(2) brown residue
(3) light green residue
(4) white residue

Open in App

Solution

Ferrous sulfate is basically a hydrated salt and blue-green in color. On heating in a dry test tube, it will lose its water molecules and become anhydrous. Decomposition reaction of ferrous sulfate is given below:
$2 {FeSO}_{4} (s) \overset{∆}{\to} {Fe}_{2} O_{3} (s) + {SO}_{2} (g) + {SO}_{3} (g)$
Fe₂O₃ is reddish brown in color.

Hence, the correct answer is option 2.

Suggest Corrections

Similar questions

A student while heating solid lead nitrate taken in a test-tube would observe :
(1) white residue of PbO2
(2) green residue of NO₂
(3) yellow residue of PbO
(4) brown residue of NO

Q. A student takes Cu, Al, Fe and Zn pieces separately in four test tubes labelled as I, II, III, and IV respectively. He adds 10 mL of freshly prepared ferrous sulphate solution to each test tube and observes the colour of the metal residue in each case.

He would observe a black residue in the test tubes :
(1) (I) and (II)
(2) (I) and (III)
(3) (II) and (III)
(4) (II) and (IV)

Q. Which of the following salts is coloured but gives white residue in dry heating test?

Q. A colourless lead salt, when heated, produces a yellow residue and brown fumes.
Name the brown fumes.

Q. A colourless lead salt, when heated, produces a yellow residue and brown fumes.
Name the lead salt.

Join BYJU'S Learning Program

A student strongly heats hydrated ferrous sulphate salt in a dry test-tube. He would observe a : (1) yellow residue (2) brown residue (3) light green residue (4) white residue

A student strongly heats hydrated ferrous sulphate salt in a dry test-tube. He would observe a :
(1) yellow residue
(2) brown residue
(3) light green residue
(4) white residue