NEET 2013 | Processes of Isolation of Elements Question 15 | Chemistry

Roasting of sulphides gives the gas X as a byproduct. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is

CO₂

SO₃

H₂S

SO₂

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

Out of Syllabus

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

carbon monoxide

copper (I) sulphide

sulphur dioxide

iron (II) sulphide.

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

Out of Syllabus

Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of

Al₂O₃ + HF + NaAlF₄

Al₂O₃ + CaF₂ + NaAlF₄

Al₂O₃ + Na₃AlF₆ + CaF₂

Al₂O₃ + KF + Na₃AlF₆

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which one of the following is a mineral of iron?

Malachite

Cassiterite

Pyrolusite

Magnetite

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