NEET Chemistry General Principles and Processes of Isolation of Elements Questions Solved

High purity copper metal is obtained by:

(a) carbon reduction

(b) hydrogen reduction

(d) thermite process

#Intro - Flux, Leaching, Roasting & Calcination

Difficulty Level:

(a)
21%
(b)
8%
(c)
64%
(d)
10%

Aluminothermic process is used for the extraction of metals, whose oxides are:

(a) fusible

(b) not easily reduced by carbon

(d) strongly basic

#Intro - Flux, Leaching, Roasting & Calcination

(b) Alumino-thermic process is commonly used for those metals which have very high m.pt. and are to be extracted from their oxides and their reduction with carbon is not satisfactory.

Difficulty Level:

(a)
22%
(b)
48%
(c)
18%
(d)
14%

Purest form of iron is:

(a) cast iron

(b) hard steel

(d) wrought iron

#Intro - Flux, Leaching, Roasting & Calcination

(D) It is a fact.

Difficulty Level:

(a)
25%
(b)
3%
(c)
9%
(d)
65%

Thomas slag is:

(a) calcium silicate

(b) calcium phosphate

(d) calcium ammonium phosphate

#Intro - Flux, Leaching, Roasting & Calcination

Difficulty Level:

(a)
28%
(b)
17%
(c)
47%
(d)
10%

Corundum is:

(a) SrO₂

(b) Al₂O₃

(d) Cu₂Cl₂

#Intro - Flux, Leaching, Roasting & Calcination

(b) Corundum is a compound of aluminium and consist of crystals of $α$ -Al₂O₃ (rhombic lattice).

Jagranjosh

Difficulty Level:

(a)
17%
(b)
54%
(c)
12%
(d)
19%

Heating of carbonate ores to remove carbon is called as:

(a) roasting

(b) calcination

(d) fluxing

#Intro - Flux, Leaching, Roasting & Calcination

(b) Calcination is a process in which the ore is heated strongly in the absence of air.

Difficulty Level:

(a)
17%
(b)
62%
(c)
19%
(d)
4%

Sulphide ores are common for the metals:

(a) Ag, Cu and Pb

(b) Ag, Cu and Sn

(d) Al, Cu and Pb

#Intro - Flux, Leaching, Roasting & Calcination

(a) Metals having high polarising power (Z_eff) exist in ore with anions having high polarisibility

Ag, Cu, Pb $\to$ Sulphide ores (Ag₂S, CuFeS₂, Pbs)

Sn $\to$ Oxide ore (SnO₂)

Mg $\to$ Sea water and dolomite (CaCO₃, MgCO₃)

Al $\to$ Oxide ore (Al₂O₃.2H₂O)

Difficulty Level:

(a)
70%
(b)
12%
(c)
8%
(d)
12%

Which element occurs freely in nature?

(a) Iodine

(b) Sulphur

(d) Magnesium

(b) Sulphur occurs in native state while iodine, phosphorus and magnesium are found in combined state.

Difficulty Level:

(a)
36%
(b)
28%
(c)
21%
(d)
16%

The metal used in storage batteries is:

(a) Cu

(b) Sn

(d) Ni

#Intro - Flux, Leaching, Roasting & Calcination

Difficulty Level:

(a)
11%
(b)
8%
(c)
65%
(d)
18%

Silver obtained by argentiferrous lead is purified by:

(a) distillation

(b) froth floatation

(d) reacting with KCN

#Refining Process

Difficulty Level:

(a)
7%
(b)
17%
(c)
29%
(d)
50%