JEE Main 2018 (Online) 15th April Evening Slot | Isolation of Elements Question 102 | Chemistry

In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'. When CO₂ gas is passed through the aqueous solution of 'X', a hydrated compound 'Y' is precipitated. 'X' and 'Y' respectively are :

NaAlO₂ and Al₂(CO₃)₃.x H₂O

A(OH)₃ and Al₂O₃.x H₂O

Na[Al(OH)₄] and Al₂O₃.x H₂O

Na[Al(OH)₄] and Al₂(CO₃)₃.x H₂O

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

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

Cu₂S

FeO

FeS

Cu₂O

JEE Main 2016 (Offline)

MCQ (Single Correct Answer)

-1

Out of Syllabus

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

Out of Syllabus

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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