Q: The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range 900 - 1500 K is(are)

(A) Limestone is added to remove silica as impurity. CaO + SiO 2 → CaSiO 3 ( in the temperature range 900 – 1500 K ) (B) Pig iron obtained from blast furnace contains 4 % carbon and many other impurities (eg. S , P , Si , Mn ) in small amount. In fusion zone molten iron becomes heavy by absorbing elemental impurities and produces Pig iron. (in the temperature range 900 – 1500 K) (C) Coke C

Q: The electrochemical extraction of aluminium from bauxite ore involves

(A) The reduction of Al 2 O 3 with coke C at a temperature > 2500 ° C is not carried out due to the formation of carbides. (B) It is correct as neutralisation of aluminate solution is done by passing CO 2 gas to precipitate hydrated alumina. (C) Reaction of powdered one is carried out with hot concentrated NaOH at 473 K - 523 K and 35 - 36 bar pressure. (D)Aluminium In the metallurgy of aluminium, purified Al 2 O 3 is mixed with Na 3 AlF 6 or CaF 2 which

Q: The correct statement s related to the metal extraction processes is(are)

A PbS + PbO → Pb + SO 2 It is self-reduction reaction. B In the extraction process of copper from copper pyrites, silica is added to produce Iron silicate. C Partial oxidation of sulphide ore of copper by roasting, followed by self-reduction produces blister copper. Cu 2 S + O 2 → Cu 2 O + SO 2 Cu 2 S + 2 Cu 2 O → self − reduction 6 Cu + SO 2 D Zn + 2 Na Au CN 2 → Na 2 Zn CN 4 + 2 Au

Q: Which among the following statement(s) is (are) true for the extraction of aluminium from bauxite?

(A) 2 NaAlO 2 + 3 H 2 O + CO 2 ⟶ 2 Al ( OH ) 3 + Na 2 CO 3 (B) In Hall-Heroult process Na 3 Al / F 6 and CaF 2 is mixed with Al 2 O 3 to lower melting point and increase conductivity. (C) Anode C ( s ) + 2 O 2 − ( melt ) → CO 2 ( g ) + 4 e − (D) Steel cathode with carbon lining and graphite anode are used.

Question 1

The correct statement(s) related to processes involved in the extraction of metals is(are)

Accepted Answer

The ore Calamine contain  ZnCO 3 . The Calamine on heating produces  ZnO . ZnCO 3 &#8594; &#8710; ZnO + CO 2 Cyanide process, also called Macarthur-forrest Process, method of extracting silver from impure ores by dissolving them in a dilute solution of sodium cyanide in the presence of oxygen. The complex formed in the above process reduced to silver metal by the treatment with zinc. O 2 + H 2 O + Ag + NaCN &#8594; Na Ag CN 2 + NaOH Na Ag CN 2 &#8594; Zn Na 2 Zn CN 4 + Ag SiO 2 ​&

Question 2

The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range 900 - 1500 &#160; K is(are)

Accepted Answer

(A) Limestone is added to remove silica as impurity. CaO &#160; + &#160; SiO 2 &#160; &#8594; &#160; CaSiO 3 &#160; ( in &#160; the &#160; temperature &#160; range &#160; 900 &#160; &#8211; &#160; 1500 &#160; K ) (B) Pig iron obtained from blast furnace contains 4 % carbon and many other impurities (eg. S , P , Si , Mn ) in small amount.  In fusion zone molten iron becomes heavy by absorbing elemental impurities and produces Pig iron. (in the temperature range 900 &ndash; 1500 K) (C) Coke C

Question 3

The electrochemical extraction of aluminium from bauxite ore involves

Accepted Answer

(A) The reduction of Al 2 O 3 with coke C at a temperature &#62; 2500 &#160; &#176; C is not carried out due to the formation of carbides. (B) It is correct as neutralisation of aluminate solution is done by passing CO 2 gas to precipitate hydrated alumina. (C) Reaction of powdered one is carried out with hot concentrated NaOH at 473 &#160; K - 523 &#160; K and 35 - 36  bar pressure. (D)Aluminium In the metallurgy of aluminium, purified Al 2 O 3 is mixed with Na 3 AlF 6  or CaF 2 which

Question 4

The correct statement  s related to the metal extraction processes is(are)

Accepted Answer

A   PbS + PbO &#8594; Pb + SO 2 It is self-reduction reaction. B  In the extraction process of copper from copper pyrites, silica is added to produce Iron silicate. C  Partial oxidation of sulphide ore of copper by roasting, followed by self-reduction produces blister copper. Cu 2 S + O 2 &#8594; Cu 2 O + SO 2 Cu 2 S + 2 Cu 2 O &#8594; self &#8722; reduction 6 Cu + SO 2 D   Zn + 2 Na Au CN 2 &#8594; Na 2 Zn CN 4 + 2 Au

Question 5

Which among the following statement(s) is (are) true for the extraction of aluminium from bauxite?

Accepted Answer

(A)  2 NaAlO 2 + 3 H 2 O + CO 2 &#10230; 2 Al ( OH ) 3 + Na 2 CO 3 (B) In Hall-Heroult process  Na 3 Al / F 6  and  CaF 2  is mixed with  Al 2 O 3  to lower melting point and increase conductivity. (C)  Anode &#8196;C ( s ) + 2 O 2 &#8722; ( melt ) &#8594; CO 2 ( g ) + 4 e &#8722; (D) Steel cathode with carbon lining and graphite anode are used.

Question 6

The cyanide process of gold extraction involves leaching out gold from its ore with C N - in the presence of Q in water to form R . Subsequently, R is treated with T to obtain A u and Z . Choose the c

Accepted Answer

Answer option index: 3

Question 7

Calamine, malachite, magnetite and cryolite, respectively are:

Accepted Answer

Fact based CuCO 3 malachite CuCO 3 . Cu OH 2 , magnetic Fe 3 O 4 cryolite CuCO 3 . Cu OH 2

General Principles and Processes of Isolation of Metals — Previous Year Questions & Solutions