When a small amount of powdered compound of iron sulphide is observed through a magnifying glass,it appears ;

a) Grey b) black c) yellow d) green

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Solution

Grey

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The elements of sets A , B and C are all colours as follows:

A = { Red , Orange , Yellow , Brown } ,

B = { Blue , Yellow , Green , Brown } ,

C = { Black , Brown , White , Grey }

Then, A U B U C is

Q. Light green (Compound 'A')

Δ - \to

White Residue (B)

H i g h - -- \to t e m p . C + D + E

(i) 'D' and 'E' are two acidic gas.
(ii) 'D' is passed through

H g {C l}_{2}

solution to give yellow ppt.
(iii) 'E' is passed through water first and then

H_{2} S

is passed, white turbidity is obtained.
(iv) A is water-soluble and addition of

H g {C l}_{2}

in it, white ppt is obtained but white ppt does not turn into grey on addition of excess solution of 'A'.
Yellow ppt in the above observation is:

When a mixture of iron powder and sulphur powder is heated strongly to form iron sulphide, then heat energy is :

(a) released (b) first absorbed and then released

Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glow red. On cooling, it forms a grey dull solid. Which statement is correct about the contents of the test tube in the experiment?

Q. Question 32
Which of the following are not compounds?
(a) Chlorine gas
(b) Potassium chloride
(c) Iron
(d) Iron sulphide
(e) Aluminium
(f) Iodine
(g) Carbon
(h) Carbon monoxide
(i) Sulphur powder

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When a small amount of powdered compound of iron sulphide is observed through a magnifying glass,it appears ; a) Grey b) black c) yellow d) green

Grey

When a small amount of powdered compound of iron sulphide is observed through a magnifying glass,it appears ;

a) Grey b) black c) yellow d) green