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

General Principles and Processes of Isolation of Elements Important Questions

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

MP Board Solutions

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) Cul2-2
(c) K2[CuI4]
(d) Cu2& I2 + I2
Answer:
(d) Cu2& 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

MP Board Solutions

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
MP Board Class 12th Chemistry Important Questions Chapter 6 General Principles and Processes of Isolation of Elements 1
Answer:

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

II.
MP Board Class 12th Chemistry Important Questions Chapter 6 General Principles and Processes of Isolation of Elements 2
Answer:

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

MP Board Solutions

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

MP Board Class 12th Chemistry Important Questions