Name the chief forms of the occurrence of the following in the earth crust:
(a) aluminium, (b) calcium, (c) sodium, (d) lead.

Solution

(a) Aluminium: Oxides:
(i) CorundumAl₂O₃(ii) DiasporeAl₂O_3.H₂O
(iii) Bauxite Al₂O_3.2H₂O

Halides: Cryolite Na₃AlF₆
Silicates:
(i) Feldspar KAlS₃O₈(ii) Mica KAlSi₃O₁₀ (OH)₂

(b) Calcium:Carbonate: Lime stone (CaCO₃) marble, chalk, calcite and dolomite Sulphate : Gypsum, CaSO₄ 2H₂O and anhydrite, CaSO₄Fluoride: Fluorspar, CaF₂, Fluorapatite 3Ca₃(PO₄)₂CaF₂ Phosphate : Phosphorite, Ca₃(PO₄)₂(c) Sodium: Sodium chloride, NaCl
Sodium nitrate or chile salt petre NaNO₃Sodium carbonate Na₂CO₃Borax Na₂B₄O₇,10H₂O.

(d) Lead: Anglesite, PbSO₄Cerussite PbCO₃Lanarkite, PbO, PbSO_4.

Some More Questions From General Principles And Processes of Isolation Of Elements Chapter

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General Principles And Processes Of Isolation Of Elements

Name the chief forms of the occurrence of the following in the earth crust:
(a) aluminium, (b) calcium, (c) sodium, (d) lead.

Some More Questions From General Principles And Processes of Isolation Of Elements Chapter

Titanium is a metal of modern times. It is obtained as oxide. Why it could not be extracted earlier despite its wide occurence?

Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

What criterion is followed for the selection of the stationary phase in chromatography?

What is the role of cryolite in the metallurgy of aluminium?

Why is zinc not extracted from zinc oxide through reduction using CO?

What is the role of graphite rod in the electrometallurgy of aluminium?

Predict conditions under which Al might be expected to reduce MgO.

Define the term gangue or matrix.

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General Principles And Processes Of Isolation Of Elements

Name the chief forms of the occurrence of the following in the earth crust:(a) aluminium, (b) calcium, (c) sodium, (d) lead.

Some More Questions From General Principles And Processes of Isolation Of Elements Chapter

Titanium is a metal of modern times. It is obtained as oxide. Why it could not be extracted earlier despite its wide occurence?

Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

What criterion is followed for the selection of the stationary phase in chromatography?

What is the role of cryolite in the metallurgy of aluminium?

Why is zinc not extracted from zinc oxide through reduction using CO?

What is the role of graphite rod in the electrometallurgy of aluminium?

Predict conditions under which Al might be expected to reduce MgO.

Define the term gangue or matrix.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Name the chief forms of the occurrence of the following in the earth crust:
(a) aluminium, (b) calcium, (c) sodium, (d) lead.