JEE Main 2016 (Online) 10th April Morning Slot | Isolation of Elements Question 100 | Chemistry

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JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

-1

Extraction of copper by smelting uses silica as an additive to remove :

Cu₂S

FeO

FeS

Cu₂O

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

-1

Sodium extract is heated with concentrated HNO₃ before testing for halogens because :

Silver halides are totally insoluble in nitric acid.

Ag₂S and AgCN are soluble in acidic medium.

S₂⁻ and CN⁻, if present, are decomposed by conc. HNO₃ and hence do not interfere in the test.

Ag reacts faster with halides in acidic medium.

JEE Main 2016 (Offline)

MCQ (Single Correct Answer)

-1

Which one of the following ores is best concentrated by froth floatation method?

Siderite

Galena

Malachite

Magnetite

JEE Main 2015 (Offline)

MCQ (Single Correct Answer)

-1

In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

Al₂O₃ is mixed with CaF₂ which lowers the melting point of the mixture and brings conductivity

Al³⁺ is reduced at the cathode to form Al

Na₃AlF₆ serves as the electrolyte

CO and CO₂ are produced in this process

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