Among $P b S, C u S, H g S, M n S, A g_{2} S, N i S, C o S, B i_{2} S_{3}, & S n S_{2,}$ the total number of black coloured sulphide are:
a) $6$
b) $7$
c) $8$
d) $9$

Answer

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Hint: Just having the basic knowledge of the compounds is enough to know get the correct answer to this question. They are a certain colour because they are found in nature or they are naturally occurring like that.

Complete step by step answer:
As its very distinct that

P b S, C u S, H g S, A g_{2} S, N i S, C o S

compounds are all black in colour, where as

M n S

is known to be dirty pink coloured,

S n S_{2}

is yellow coloured compound,

B i_{2} S_{3}

is a brownish black coloured compound so the correct answer is; option A.
There are total

6

black coloured sulphide compounds.
Additional information:

P b S

or phosphate buffered saline is a buffer solution which is commonly used in biological research. It is a water based salt solution which contains sodium hydrogen phosphate. The buffer helps to maintain the pH.

C u S

Or copper monosulfide is a chemical compound of copper and sulphur. It has a moderate conductor of electricity. It has a potential use in catalysis.

H g S

Or mercury sulphide is a chemical compound composed of elements like mercury and sulphur. It is insoluble in water.

A g_{2} S

Or silver sulphide is an inorganic compound which is a dense black solid which is the only sulphide of silver. It has many uses like a photosensitizer in photography. It is insoluble in solvents and can be degraded by strong acids.

N i S

Or nickel sulphide is also an inorganic compound which is black solid which can be produced by treating nickel salts with hydrogen sulphide. They are sometimes used as catalysts.

C o S

Or carbonyl sulphide is a colourless, flammable gas with a very unpleasant odor.

So, the correct answer is Option A.

Note: This is a tricky question as some of you might consider