NEET Chemistry: General Principles and Processes of Isolation of Elements questions with solutions

Q1. The element which could be extracted by electrolytic reduction of its oxide dissolved in a high temperature melt is:

1. sodium
2. magnesium
3. flourine
4. aluminium

Answer: aluminium

Aluminium is extracted by electrolytic reduction of alumina dissolved in a high-temperature molten electrolyte. This works because aluminium is too reactive to be obtained by ordinary chemical reduction, so electrolysis is used instead.

Q2. The method of extraction of Ag by cyano complex formation followed by metal displacement is called

1. Parke's method
2. McArthur-Forest method
3. serpeck method
4. Hall's method

Answer: Parke's method

In Parke's method, silver is extracted by forming a soluble cyanide complex and then precipitated/recovered by displacement with a more reactive metal. This is the classic cyanide-leaching and metal-displacement route used for silver extraction.

Q3. Pyrolusite is a/an:

1. oxide ore
2. sulphide ore
3. carbide ore
4. not an ore

Answer: oxide ore

Pyrolusite is manganese dioxide, MnO2. Because it is an oxide of a metal, it is classified as an oxide ore.

Q4. Match List I and List II. List I

1. Americium 1. Lanthanide
2. Lanthanum 2. Transition metal
3. Promethium 3. Actinide
4. Technician 4. Synthetic element 5. Radioactive element B. \( A-3,5 ; B-4 ; C-5 ; D-2 \) c. \( A-5 ; B-1,3 ; C-2,3 ; D-4 \) D. A - 2,5; B - 2; C - 1,5; D - -

Answer: Promethium 3. Actinide

Americium is an actinide and is radioactive/synthetic. Lanthanum is a lanthanide, while promethium is a lanthanide that is also radioactive and essentially synthetic in occurrence. The remaining item is not a standard element name, so the intended matching relies on these family properties.