Quiz-11-Metallurgy

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GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS Quiz-11

Dear Readers,

The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry. .

Q1. The metal that is extracted from sea water is:

•  Na
•  Ca
•  Mg
•  Sn

Solution
Magnesium chloride is present in sea water.

Q2.Bronze is a mixture of:

•  Pb+Sn
•  Cu+Sn
•  Cu+Zn
•  Pb+Zn

Solution
Bronze is mixture of Cu and Sn.

Q3.  An example of an oxide is:

•   Zinc blende
•  Bauxite
•  Feldspar
•  Malachite

Solution
Bauxite (Al_2 O_3.2H_2 O) is an oxide ore of aluminium.

Q4. In Goldschmidt aluminothermic process, thermite mixture contains:

•  3 parts Fe_2 O_3 and 2 parts Al
•  3 parts Al_2 O_3 and 4 parts Al
•  1 part Fe_2 O_3 and 3 parts Al
•  3 parts Fe_2 O_3 and 1 part Al

Solution
It is a fact.

Q5.Which of the following ore is used for industrial extraction of aluminium in India?

•  Corundum
•  Cryolite
•  Bauxite
•  Kaolin

Solution
 Aluminium is mainly isolated from bauxite (Al_2 O_3.2H_2 O) ore which is generally contaminated with ferric oxide and silica.

Q6. Which consists of only one element?

•  Marble
•  Sand
• Diamond
•  Glass

Solution
Diamond consists of carbon atoms only.

Q7. In electro-refining of metal the impure metal is made the anode and a strip of pure metal,the cathode,during the electrolysis of an aqueous solution of a complex metal salt. This method cannot be used for refining of:

•  Silver
•  Copper
•  Aluminium
•  Sodium

Solution
Sodium has high reactivity towards water..

Q8. Which is not employed for refining of metal?:

•  Poling
•  TLeaching
•  Electrolysis
•  Liquation

Solution
Leaching is used to make insoluble ore in soluble form.

Q9. Which of the following substances can be used for drying gases?

•  CaO
•  NaHCO_3
•  CaCO_3
•  Na_2 CO_3

Solution
CaO absorbs moisture and hence,can be used for drying gases.

Q10. Which of the following mineral does not contain Al?

•  Fluorspar
•  Cryolite
•  Mica
• Feldspar

Solution
Fluorspar (CaF_2 ), Cryolite(na_3 AlF_6 ) Feldspar (KAlSi_3 O_3), Mica (K_2 O.3Al_2 O_3.6SiO_2.2H_2 O) .