The basic principle of froth floatation is-

1.  Impurities and metal ore have different wetting properties. 
2. Impurities and metal ore have different solubility.
3. Impurities and metal ore have different diversity.
4. Impurities and metal ore have different compressing power. 

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 84%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Out of the following which metal can be purified by Van Arkel method?

1.  Au

2.  Zr

3.  Ag

4.  Cu

Subtopic:  Refining Process |
 94%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

During electrolysis of fused NaCl in order to obtain Na, H2 is liberated at the cathode of Pt while with the cathode of Hg, it forms sodium amalgam. This is because

(I)  Pt is inert

(2)  Hg is a liquid

(3)  More voltage is required to produce H2 at Hg than at Pt

(4)  H ions are formed rapidly when Hg is used as a cathode

Subtopic:  Electrode & Electrode Potential |
 53%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

Which of the following is an incorrect match?

1. Kaolinite - Al2(OH)4Si2O5

2. Cuprite - Cu2O

3. Siderite - FeCO3

4. Calamine - ZnSO4

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 74%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Among the following a non-oxide ore is:

1. Malachite

2. Cuprite

3. Zincite

4. Bauxite

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 60%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Mg in the Kroll process acts as

(1)  Reducing agent

(2)  Oxidizing agent

(3)  Oxidizing agent at low temperature

(4)  Reducing agent at low temperature

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 55%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

Out of the following which is a hydride?

(1)  Hydrolith

(2)  Oxidane

(3)  Azane

(4)  All of these

Subtopic:  Type of Hydride |
 83%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

The process of converting hydrated alumina into anhydrous alumina is called

(1)  Roasting

(2)  Smelting

(3)  Dressing

(4)  Calcination

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 52%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

2MS + 3O2 → 2MO + 2SO2
2MO + MS → 3M + SO2

The metal M in above-mentioned reaction is:

1. Mg

2. Pb

3. Sn

4. Fe

Subtopic:  Metallurgy of individual elements |
 69%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

Consider the following reaction.
\(\small{Bauxite\ ore\ +\ NaOH\ (conc.) \xrightarrow[\Delta]{Digester} \underset{Soluble}{(A)}}\)
\((A) \xrightarrow{Fresh\ Al(OH)_3}\ \underset{White}{(B)}\ +\ (C)\)
\({(B)} \xrightarrow[]{\Delta}\ (D)\ +\ H_2O\)
What is the molecular formula of compound D?

1. NaAlO2

2. AlOH3

3. Al2O3

4. Na2O

Subtopic:  Intro - Flux, Leaching, Roasting & Calcination |
 80%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch