1.

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 Solubility in carbon disulphide Fe S FeS Fe S FeS (A) Yellow Silvery Greyish silver (✔) (✕) (✔) Silvery Orange Reddish brown (✕) (✔) (✔) (B) (C) Grey Yellow Greyish black (✕) (✔) (✕) (D) Silvery White Silvery white (✔) (✕) (✕) The student, who correctly reported the observations, is student :(1) (A)(2) (B)(3) (C)​(4) (D)

Answer» 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 Solubility in carbon disulphide
Fe S FeS Fe S FeS
(A) Yellow Silvery Greyish silver (✔) (✕) ()
Silvery Orange Reddish brown (✕) (✔) (✔)
(B)
(C) Grey Yellow Greyish black (✕) (✔) (✕)
(D) Silvery White Silvery white (✔) (✕) (✕)

The student, who correctly reported the observations, is student :

(1) (A)

(2) (B)

(3) (C)

​(4) (D)






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