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Mole Concept and Avogadro's Number

Two elements ...

Question

Two elements are present in the iron-sulphur mixture, and the compound FeS. However, only FeS is considered a pure substance. Assign a reason.

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Q. A d-block element iron

(F e)

forms two types of compounds,

F e S O_{4}

F e_{2} (S O_{4})_{3}

.
(a) Which of these compounds contains ferric

(F e^{3 +})

ion?
(b) What is the number of electrons present in the d-sub-shell of

F e^{3 +}

ion? Find out by writing the sub-shell's electronic configuration.
[Given: Atomic number of Fe is 26]

Q. A student heats calculated amounts of iron filings and sulphur powder together in a boiling tube. He will obtain :
(1) a homogeneous mixture of Fe and S
(2) a heterogeneous compound of Fe and S
(3) a homogeneous compound of FeS
(4) a heterogeneous mixture of FeS, Fe and S

Q. A .............. (mixture/compound) is a pure substance containing two or more (elements/compounds) in a fixed proportion.

sodium cloride contains two elements but it is still a pure substance. assign reason

Q. Why compounds are included in pure substances although it contains more than one element,while mixtures are considered pure

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