JEE Main 2020 (Online) 7th January Evening Slot | Isolation of Elements Question 79 | Chemistry

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JEE Main 2020 (Online) 7th January Evening Slot

MCQ (Single Correct Answer)

-1

The refining method used when the metal and the impurities have low and high melting temperatures, respectively, is :

liquation

vapour phase refining

distillation

zone refining

JEE Main 2020 (Online) 7th January Morning Slot

MCQ (Single Correct Answer)

-1

The purest from of commercial iron is :

pig iron

wrought iron

cast iron

scrap iron and pig iron

JEE Main 2019 (Online) 12th April Evening Slot

MCQ (Single Correct Answer)

-1

The correct statement is :

leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate

the Hall-Heroult process is used for the production of aluminium and iron

pig iron is obtained from cast iron

the blistered appearance of copper during the metallurgical process is due to the evolution of CO₂

JEE Main 2019 (Online) 12th April Morning Slot

MCQ (Single Correct Answer)

-1

The idea of froth floatation method came from a person X and this method is related to the process Y of ores. X and Y, respectively, are :

washer woman and concentration

fisher woman and concentration

wisher man and reduction

fisher man and reduction

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