MP Board Class 12th Chemistry Important Questions Chapter 6 General Principles and Processes of Isolation of Elements

MP Board Class 12th Chemistry Important Questions Chapter 6 General Principles and Processes of Isolation of Elements

MP Board Class 12th Chemistry Important Questions Chapter 6 General Principles and Processes of Isolation of Elements

Objective Type Questions

Question 1.
Choose the correct answer :

Question 1.
In the extraction of Fe from haematite, lime stone acts as :
(a) Reducing agent
(b) Slag
(c) Gange
(d) Flux.
Answer:
(d) Flux.

Question 2.
Cupellation is used in the metallurgy of:
(a) Cu
(b) Ag
(c) Al
(d) Fe.
Answer:
(b) Ag

Question 3.
Which is the essential part of photographic plates and Films :
(a) AgNO₃
(b) Ag₂S₂O₃
(c) AgBr
(d)Ag₂CO₃
Answer:
(c) AgBr

Question 4.
Malachite is :
(a) Cu₂S
(b) CUCO₃.CU(OH)₂
(c) Cu₂O
(d) CuCO₃.
Answer:
(b) CUCO₃.CU(OH)₂

Question 5.
AgBr is soluble in hypo because its forms :
(a) Ag₂SO₃
(b) Ag₂S₂O₃
(c) [Ag(S₂O₃)₃]^–
(d) [Ag(S₂O₃)₂]^3-
Answer:
(c) [Ag(S₂O₃)₃]^–

Question 6.
AgCl is soluble in ammonia due to the formation of:
(a) [Ag(NH₃)₄]⁺
(b) [Ag(NH₃)₃]²⁺
(c) [Ag(NH₃)₄]³⁺
(d) [Ag(NH₃)₂]⁺
Answer:
(d) [Ag(NH₃)₂]⁺

Question 7.
When KI mixed with solution of CuSO₄, it forms :
(a) Cul₂
(b) Cul^2-₂
(c) K₂[CuI₄]
(d) Cu_2& I₂ + I₂
Answer:
(d) Cu_2& I₂ + I₂

Question 8.
When KCN reacts with solution of CuSO₄, it forms :
(a) CU(CN)₂
(b) CuCN
(c) K₂[Cu(CN)₄]
(d) K₃[Cu(CN)₄]
Answer:
(d) K₃[Cu(CN)₄]

Question 9.
Na₂S₂O₃ used in photography as a :
(a) Reducing agent
(b) Developer
(c) Fixer
(d) Toning agent
Answer:
(c) Fixer

Question 10.
Calomel is :
(a) Hg₂ Cl₂
(b) HgCl₂
(c) Hg₂ Cl₂ +Hg
(d) Hg + Hgcl₂
Answer:
(a) Hg₂ Cl₂

Question 11.
German silver is an alloy of :
(a) Cu, Zn and Ni
(b) Cu, Zn and Sn
(c) Ag, Cu and Au
(d) Fe, Cr, Ni
Answer:
(a) Cu, Zn and Ni

Question 12.
Heating pyrites to remove sulphur is called :
(a) Roasting
(b) Liquation
(c) Calcination
(d) Smelting
Answer:
(a) Roasting

Question 13.
Reducing agent in the extraction of Iron from haematite is :
(a) CO
(b) C
(c) CO₂
(d) FeO
Answer:
(a) CO

Question 14.
The Chemical Composition of “Cryolite” mineral is :
(a) Al₂O₃
(b) Al₂O₃.12H₂O
(c) KAl Si₃O₈
(d) Na₃AlF₆
Answer:
(d) Na₃AlF₆

Question 15.
In Photography we use :
(a) Agl
(b) NH₃
(c) AgCl
(d) AgBr
Answer:
(d) AgBr

Question 16.
Blister copper is :
(a) Ore of copper
(b) Alloy of copper
(c) Pure copper
(d) Copper containing 1% empuritis.
Answer:
(d) Copper containing 1% empuritis.

Question 2.
Fill in the blanks :

1. Malachite is an ore of …………………
2. In stainless steel, along with iron ………………… and ………………… metals form alloys.
3.  ………………… is used as a purgative.
4. Colloidal solution of ………………… is used as a medicine of eyes.
5. AgNO₃ is known as …………………
6. Chemical formula of corrosive sublimate is …………………
7. Froath floatation process is generally employed for ………………… ores.
8. The process in which metal oxide is reduced by Al is known as …………………
9. Is used for drying ammonia …………………
10.  ………………… is called lunar caustic.
11. The chemical formula of fluorspar is …………………
12. Alkaline solution of HgCl₂ and Kl is known as …………………
13. Red hot steel is slowly cooled when it gets converted to soft steel, this is known as …………………

Answer:

1. Cu
2. Cr, Ni
3. Calomel
4. Ag
5. Lunar caustic,
6. HgCl₂
7. Sulphide
8. Aluminothermic
9. CuO
10. Silver Nitrate
11. CaF₂
12. Nesseler’s reagent
13. Annealing.

Question 3.
Match the following :
I

Answer:

1. (g)
2. (d)
3. (c)
4. (e)
5. (b)
6. (a)
7. (f)

II.

Answer:

1. (d)
2. (f)
3. (b)
4. (e)
5. (c)
6. (a)

Question 4.
Answer in one word / sentence :

1. The mixture of Cu₂S and FeS obtained from blast furnace is known as.
2. Which metal is purified by polling?
3. After developing which solution is used for the fixing of photographic films? Chemical formula of philosophers’s wool is.
4. Chemical formula of horn silver.
5. Which compound is normally used for toning in photography?
6. Which are known as coinage metals?
7. Give the name of ore used for extraction of Cu.
8. Give the name of ore used for extraction of Iron.
9. What is the name of graph which is drawn between the absolute temperature and standard free energy change for
10. formation of metal oxide?
11. What is the name of iron obtained after the removal of impurities from cast iron?
12. What is the method of slow cooling of hot hard steel known as?
13. What is the method of heating hard steel known as?
14. What is the method of heating steel in pressure of ammonia known as?
15. What is Lunar Caustic?

Answer:

1. Matte
2. Copper
3. Hypo solution (Na₂S₂O₃)
4. ZnO
5. AgCl
6. Aurric chloride
7. Cu, Ag and Au
8. Copperpyrite
9. Haematite
10. Ellinghum diagram
11. Wrought iron
12. Annealing
13. Softening
14. Nitriding
15. AgNO₃

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