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Question

What is the total number of black-colored sulfides among Ag2S,Bi2S3,CoS,CuS,HgS,MnS,NiS,PbS,andSnS2.


A

Two

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B

Four

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C

Six

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D

Eight

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Solution

The correct option is C

Six


The explanation for correct option:

C. Six

1. Silver sulfide:

  • The chemical formula for Silver sulfide is Ag2S.
  • It is greyish black in color.

2. Bismuth (III) sulfide:

  • The chemical formula for Bismuth (III) sulfide is Bi2S3.
  • It is dark brown in color in its crystalline form but appears black in color white precipitation.

3. Cobalt sulfide:

  • The chemical formula for Cobalt sulfide is CoS.
  • It is black in color.

4. Copper monosulfide:

  • The chemical formula for Copper monosulfide is CuS.
  • It is black in color.

5. Lead (II) sulfide:

  • The chemical formula for lead (II) sulfide is PbS.
  • It is black in color.

6. Mercury sulfide:

  • The chemical formula for Mercury sulfide is HgS.
  • It is found in red as well as black in color.

Thus, there is a total of six sulfides that are black in color.

The explanation for incorrect options:

The other sulfides are discussed below:

1. Manganese(II) sulfide

  • The chemical formula for Manganese(II) sulfide is MnS.
  • It is found in red, green, brown, and pink colors.

2. Nickel sulfide:

  • The chemical formula for Nickel sulfide is NiS.
  • It is a colorless sulfide.

3. Tin(IV) sulfide:

  • The chemical formula for Tin(IV) sulfide is SnS2.
  • It is a golden-yellowish solid.

Thus, options A, B, and D are incorrect. Hence, the correct option is C i.e. Six.


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