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General Principles and Processes of Isolation of Elements Chemistry - General Principles and Processes of Isolation of Elements

Jharkhand Board (JAC) - STD 12 Science - Chemistry (Jharkhand - English Medium). 288 questions in this chapter.

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General Principles and Processes of Isolation of Elements question types

288 questions across 6 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

288
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6
Question groups
5
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Sample Questions

General Principles and Processes of Isolation of Elements questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 2M.C.Q (1 Marks)1 Mark
If impurities can be oxidized more easily than the metal itself, which method is used?
  • A
    Liquation method.
  • B
    Distillation method.
  • ✓
    Oxidation method.
  • D
    None of these.

Answer: C.

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Q 3M.C.Q (1 Marks)1 Mark
Which of these is not the step involved in extraction of an ore?
  • A
    Concentration of the ore.
  • B
    Electrolysis.
  • C
    Reduction using carbon.
  • ✓
    Corrosion.

Answer: D.

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Q 4M.C.Q (1 Marks)1 Mark
Which of the following reactions is an example of autoreduction.
  • A
    $\text{Fe}_{3}\text{O}_{4}+4\text{CO}\xrightarrow{\ \ \ \ \ }3\text{Fe}+4\text{CO}_{2}$
  • B
    $\text{Cu}_{2}\text{O}+\text{C}\xrightarrow{\ \ \ \ }2\text{Cu}+\text{CO} $
  • C
    $\text{Cu}^{+2}(\text{aq})+\text{Fe}(\text{s})\xrightarrow{\ \ \ \ \ } \text{Cu}(\text{s}) +\text{Fe}^{2+}(\text{aq})$
  • ✓
    $\text{Cu}_{2}\text{O}+\frac{1}{2}\text{Cu}_{2}\text{S}\xrightarrow{\ \ \ \ }3\text{Cu}+\frac{1}{2}\text{SO}_{2} $

Answer: D.

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Q 6Assertion (A) & Reason (B) MCQ1 Mark
Two statements are given$-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\text{(a), (b), (c)}$ and $(d)$ as given below:
Assertion $(A):\ Au$ and $Ag$ are extracted by leaching their ores with a dil. solution of $\text{NaCN}.$
Reason $(R):\ $ Impurities associated with these ores dissolve in $\text{NaCN}.$
  • A
    Both Assertion $(A)$ and Reason $(R)$ are correct statements, and Reason $(R)$ is the correct explanation of the Assertion $(A).$
  • B
    Both Assertion $(A)$ and Reason $(R)$ are correct statements, but Reason $(R)$ is not the correct explanation of the Assertion $(A).$
  • ✓
    Assertion $(A)$ is correct, but Reason $(R)$ is incorrect statement.
  • D
    Assertion $(A)$ is incorrect, but Reason $(R)$ is correct statement.

Answer: C.

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Q 225 Marks Questions5 Marks
Match the items of Column I with items of Column II and assign the correct code:
 
Column I
 
Column II
$(A)$
Pendulum
$(1)$
Chrome steel
$(B)$
Malachite
$(2)$
Nickel steel
$(C)$
Calamine
$(3)$
$Na_3AlF_6$
$(D)$
Cryolite
$(4)$
$CuCO_3.Cu (OH)_2$
 
 
$(5)$
$ZnCO_3$
  1. $A (1) B (2) C (3) D (4)$
  2. $A (2) B (4) C (5) D (3)$
  3. $A (2) B (3) C (4) D (5)$
  4. $A (4) B (5) C (3) D (2)$
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Q 235 Marks Questions5 Marks
Match the items of Column I with items of Column II and assign the correct code:
 
Column I
 
Column II
(A)
 Cyanide process
(1)
 Ultrapure Ge
(B)
 Froth Floatation process
(2)
 Dressing of ZnS
(C)
 Electolytic reduction
(3)
 Extraction of Al
(D)
 Zone refinning
(4)
 Extraction of Au
 
 
(5)
 Purification of Ni
  1. A (4) B (2) C (3) D (1)
  2. A (2) B (3) C (1) D (5)
  3. A (1) B (2) C (3) D (4)
  4. A (3) B (4) C (5) D (1)
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Q 245 Marks Questions5 Marks
Match the items of Column I with items of Column II and assign the correct code:
 
Column I
 
Column II
$(A)$
Sapphire
$(1)$
$Al_2O_3$
$(B)$
Sphalerite
$(2)$
$NaCN$
$(C)$
Depressant
$(3)$
$CO$
$(D)$
Corundum
$(4)$
$ZnS$
 
 
$(5)$
$Fe_2O_3$
  1. $A (3) B (4) C (2) D (1)$
  2. $A (5) B (4) C (3) D (2)$
  3. $A (2) B (3) C (4) D (5)$
  4. $A (1) B (2) C (3) D (4)$
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Q 255 Marks Questions5 Marks
Match the items of Column I with items of Column II and assign the correct code:
 
Column I
 
Column II
(A)
Coloured bands
(1)
Zone refining
(B)
LImpure matal to volatie complex
(2)
Fractional distillation
(C)
Purification of Ge and Si
(3)
Mond process
(D)
Purification of mercury
(4)
Chromatophy
 
 
(5)
Liquation
  1. A (1) B (2) C (4) D (5)
  2. A (4) B (3) C (1) D (2)
  3. A (3) B (4) C (2) D (1)
  4. A (5) B (4) C (3) D (2)
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Q 265 Marks Questions5 Marks
Match the items of Column I with items of Column II and assign the correct code:
 
Column I
 
Column II
(A)
Blisterred Cu
(1)
Aluminium
(B)
Blast furnace
(2)
$2\text{Cu}_{2}\text{O}+\text{Cu}_{2}\text{S}\ \xrightarrow{\ \ \ \ \ }6\text{Cu}+\text{SO}_{2}$
(C)
Reveerberatory furnace
(3)
Iron
(D)
Hall - Hereoult proess
(4)
$\text{FeO}+\text{SiO}_{2}\ \xrightarrow{\ \ \ \ \ }\text{FeSiO}_{3}$
 
 
(5)
$2\text{Cu}_{2}\text{S}+3\text{O}_{2}\ \xrightarrow{\ \ \ \ \ }2\text{Cu}_{2}\text{O}+2\text{SO}_{2}$
  1. A (2) B (3) C (4) D (1)
  2. A (1) B (2) C (3) D (5)
  3. A (5) B (4) C (3) D (2)
  4. A (4) B (5) C (3) D (2)
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