MCQs of General Principles and Processes of Isolation of Elements

Showing 111 to 120 out of 154 Questions

111.

_____ carbon is used up for 1 kg. aluminium production in Haul-Heroult process.

112.

Which one is used in leaching process to obtained gold ?

113.

Which are the common principle for metallurgy ?

(a)	Thermodynamics and Electrochemistry
(b)	Chemical kinematics and Electrochemistry
(c)	Thermodynamics and Adsorption
(d)	Thermodynamics and Adsorption

114.

{Fe}_{2} O_{3} \cdot {xH}_{2} O_{(s)} \to {Fe}_{2} O_{3 (s)} + {xH}_{2} O_{(g)}

115.

2 {PbS}_{(s)} + 3 {O_{2}}_{(g)} \to 2 {PbO}_{(s)} + 2 {SO}_{2}_{(g)} above reaction is_____

116.

{Zr}_{(s)} + 2 {I_{2}}_{(g)} \to {ZrI}_{4}_{(g)} \to {Zr}_{(s)} + 2 {I_{2}}_{(g)}

The reaction indicates_____

117.

In the equation

4 M + 8 {CN}^{-} + 2 H_{2} O + O_{2} \to 4 {[M (CN)_{2}]}^{-} + 4 {OH}^{-}

the metal M is_____

118.

In Hall's process, the main reagent mixed with _____

119.

During the process of electrolytic refining of copper,some metals present as impurity settle as "anode mud." These are _____

120.

Which of the following statements, about the advantages of roasting of sulphide ore before reduction is not true ?

(a)	The ΔG° of the sulphide is grater than those for CS₂ and H₂S.
(b)	The ΔG° is negative for roasting of sulphide ore to oxide.
(c)	Roasting of the Sulphide to the oxide is thermodynamically feasible.
(d)	Carbon and hydrogen are suitable reducing agents for metal sulphide.

Showing 111 to 120 out of 154 Questions