Question

Four students, (A), (B), (C) and (D) observed the colour and solubility of iron, sulphur and iron sulphide in carbon disulphide. The tick mark (✓) represents 'soluble', and cross mark (×) represents 'insoluble' in carbon disulphide. Their observations are tabulated below Student
Colour
Colour
Colour
Solubility in carbon disulphide
Solubility in carbon disulphide
Solubility in carbon disulphide
Student
Fe
S
FeS
Fe
S
FeS
(A)
(B)
(C)
(D)
Yellow
Silvery
Grey
Silvery
Silvery
Orange
Yellow
White
Greyish silver
Reddish brown
Greyish black
Silvery white
(✓)
(×)
(×)
(✓)
(×)
(✓)
(✓)
(×)
(✓)
(✓)
(×)
(×)
The student, who correctly reported the observation, is student (1) (A)
(2) (B)
(3) (C) (4) (D)

Answer 1

Answer:

This is very lengthy answer so I can't type long answers, sorry

Answer 2

The student that report the observation correctly is C.

Explanation:

• From the question, it is understood that four students were observing the solubility and the colour of sulphur, iron and iron sulphur and iron sulphide in carbon disulphide.  
• When Fe (s) reacts with S (s), it results in the formation of $F e S(s)$, which is greyish black.  
• It is also to be noted that large number of elements dissolve elemental sulfur. From the results it is observed that the Ferrous is in Grey in colour, Sulphur is in Yellow colour and $F e S$ is in greyish black. So, the observations made by the student C are correct.