NEET Test Series from KOTA - 10 Papers In MS WORD
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11. THE P-BLOCK ELEMENTS
189679
For the electrolytic production of aluminium, \((i)\) the cathode and \((ii)\) the anode are made of
1 \((i)\) Platinum and \((ii)\) Iron
2 \((i)\) Copper and \((ii)\) Iron
3 \((i)\) Copper and \((ii)\) Carbon
4 \((i)\) Carbon and \((ii)\) Carbon
Explanation:
For the electrolytic production of aluminium \((i)\) the cathode and \((ii)\) the anode are both made of graphite.
11. THE P-BLOCK ELEMENTS
189680
In the commercial electrochemical process for aluminium extraction, the electrolyte used is
1 \(Al{(OH)_3}\) in \(NaOH\) solution
2 An aqueous solution of \(A{l_2}{(S{O_4})_3}\)
3 A molten mixture of \(A{l_2}{O_3}\) and \(N{a_3}Al{F_6}\)
4 A molten mixture of \(AlO(OH)\) and \(Al{(OH)_3}\)
Explanation:
In the commercial electrochemical process for aluminium extraction, the electrolyte used is .a molten mixture of \(Al _2 O _3\) (alumina) and \(Na _3 AIF _6\) (cryolite).
11. THE P-BLOCK ELEMENTS
189751
Which is correct oxidation state of lead
1 \(+ 2\), \(+ 4\)
2 \(+ 1\), \(+ 2\)
3 \(+ 3\), \(+ 4\)
4 \(4\)
Explanation:
Lead shows two types oxidation states \(+2\) oxidation state which is lower oxidation state due to inert pair effect(stable oxidation state for lead). \(+4\) oxidation state which is Higher oxidation state
11. THE P-BLOCK ELEMENTS
189683
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out in the presence of
1 \(NaCl\)
2 Fluorite
3 Cryolite which forms a melt with lower melting temperature
4 Cryolite which forms a melt with higher melting temperature
Explanation:
Hall and Heroult's process: \(2 Al _2 O _3+3 C \rightarrow 4 Al +3 O _2\) Cathode \(: Al ^{3+}(\) melt \()+3 e ^{-} \rightarrow Al (l)\) Anode \(: C ( s )+ O ^{2-}( g )(\) melt \() \rightarrow CO ( g )+2 e ^{-}\) \(C ( s )+2 O ^{2-}( g )(\text { melt }) \rightarrow CO _2( g )+4 e ^{-}\) The electrolysis of alumina by Hall and Heroult's process is carried by using a fused mixture of alumina \(\left( Al _2 O _3\right)\) and cryolite \(\left( Na _3 AlF _6\right.\), sodium hexafluoroaluminate) along with minor quantities of aluminum fluoride \(\left( AlF _3\right)\) and fluorspar \(\left( CaF _2\right)\). The addition of cryolite and fluorspar increases the electrical conductivity of alumina and lowers the fusion temperature.
189679
For the electrolytic production of aluminium, \((i)\) the cathode and \((ii)\) the anode are made of
1 \((i)\) Platinum and \((ii)\) Iron
2 \((i)\) Copper and \((ii)\) Iron
3 \((i)\) Copper and \((ii)\) Carbon
4 \((i)\) Carbon and \((ii)\) Carbon
Explanation:
For the electrolytic production of aluminium \((i)\) the cathode and \((ii)\) the anode are both made of graphite.
11. THE P-BLOCK ELEMENTS
189680
In the commercial electrochemical process for aluminium extraction, the electrolyte used is
1 \(Al{(OH)_3}\) in \(NaOH\) solution
2 An aqueous solution of \(A{l_2}{(S{O_4})_3}\)
3 A molten mixture of \(A{l_2}{O_3}\) and \(N{a_3}Al{F_6}\)
4 A molten mixture of \(AlO(OH)\) and \(Al{(OH)_3}\)
Explanation:
In the commercial electrochemical process for aluminium extraction, the electrolyte used is .a molten mixture of \(Al _2 O _3\) (alumina) and \(Na _3 AIF _6\) (cryolite).
11. THE P-BLOCK ELEMENTS
189751
Which is correct oxidation state of lead
1 \(+ 2\), \(+ 4\)
2 \(+ 1\), \(+ 2\)
3 \(+ 3\), \(+ 4\)
4 \(4\)
Explanation:
Lead shows two types oxidation states \(+2\) oxidation state which is lower oxidation state due to inert pair effect(stable oxidation state for lead). \(+4\) oxidation state which is Higher oxidation state
11. THE P-BLOCK ELEMENTS
189683
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out in the presence of
1 \(NaCl\)
2 Fluorite
3 Cryolite which forms a melt with lower melting temperature
4 Cryolite which forms a melt with higher melting temperature
Explanation:
Hall and Heroult's process: \(2 Al _2 O _3+3 C \rightarrow 4 Al +3 O _2\) Cathode \(: Al ^{3+}(\) melt \()+3 e ^{-} \rightarrow Al (l)\) Anode \(: C ( s )+ O ^{2-}( g )(\) melt \() \rightarrow CO ( g )+2 e ^{-}\) \(C ( s )+2 O ^{2-}( g )(\text { melt }) \rightarrow CO _2( g )+4 e ^{-}\) The electrolysis of alumina by Hall and Heroult's process is carried by using a fused mixture of alumina \(\left( Al _2 O _3\right)\) and cryolite \(\left( Na _3 AlF _6\right.\), sodium hexafluoroaluminate) along with minor quantities of aluminum fluoride \(\left( AlF _3\right)\) and fluorspar \(\left( CaF _2\right)\). The addition of cryolite and fluorspar increases the electrical conductivity of alumina and lowers the fusion temperature.
189679
For the electrolytic production of aluminium, \((i)\) the cathode and \((ii)\) the anode are made of
1 \((i)\) Platinum and \((ii)\) Iron
2 \((i)\) Copper and \((ii)\) Iron
3 \((i)\) Copper and \((ii)\) Carbon
4 \((i)\) Carbon and \((ii)\) Carbon
Explanation:
For the electrolytic production of aluminium \((i)\) the cathode and \((ii)\) the anode are both made of graphite.
11. THE P-BLOCK ELEMENTS
189680
In the commercial electrochemical process for aluminium extraction, the electrolyte used is
1 \(Al{(OH)_3}\) in \(NaOH\) solution
2 An aqueous solution of \(A{l_2}{(S{O_4})_3}\)
3 A molten mixture of \(A{l_2}{O_3}\) and \(N{a_3}Al{F_6}\)
4 A molten mixture of \(AlO(OH)\) and \(Al{(OH)_3}\)
Explanation:
In the commercial electrochemical process for aluminium extraction, the electrolyte used is .a molten mixture of \(Al _2 O _3\) (alumina) and \(Na _3 AIF _6\) (cryolite).
11. THE P-BLOCK ELEMENTS
189751
Which is correct oxidation state of lead
1 \(+ 2\), \(+ 4\)
2 \(+ 1\), \(+ 2\)
3 \(+ 3\), \(+ 4\)
4 \(4\)
Explanation:
Lead shows two types oxidation states \(+2\) oxidation state which is lower oxidation state due to inert pair effect(stable oxidation state for lead). \(+4\) oxidation state which is Higher oxidation state
11. THE P-BLOCK ELEMENTS
189683
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out in the presence of
1 \(NaCl\)
2 Fluorite
3 Cryolite which forms a melt with lower melting temperature
4 Cryolite which forms a melt with higher melting temperature
Explanation:
Hall and Heroult's process: \(2 Al _2 O _3+3 C \rightarrow 4 Al +3 O _2\) Cathode \(: Al ^{3+}(\) melt \()+3 e ^{-} \rightarrow Al (l)\) Anode \(: C ( s )+ O ^{2-}( g )(\) melt \() \rightarrow CO ( g )+2 e ^{-}\) \(C ( s )+2 O ^{2-}( g )(\text { melt }) \rightarrow CO _2( g )+4 e ^{-}\) The electrolysis of alumina by Hall and Heroult's process is carried by using a fused mixture of alumina \(\left( Al _2 O _3\right)\) and cryolite \(\left( Na _3 AlF _6\right.\), sodium hexafluoroaluminate) along with minor quantities of aluminum fluoride \(\left( AlF _3\right)\) and fluorspar \(\left( CaF _2\right)\). The addition of cryolite and fluorspar increases the electrical conductivity of alumina and lowers the fusion temperature.
189679
For the electrolytic production of aluminium, \((i)\) the cathode and \((ii)\) the anode are made of
1 \((i)\) Platinum and \((ii)\) Iron
2 \((i)\) Copper and \((ii)\) Iron
3 \((i)\) Copper and \((ii)\) Carbon
4 \((i)\) Carbon and \((ii)\) Carbon
Explanation:
For the electrolytic production of aluminium \((i)\) the cathode and \((ii)\) the anode are both made of graphite.
11. THE P-BLOCK ELEMENTS
189680
In the commercial electrochemical process for aluminium extraction, the electrolyte used is
1 \(Al{(OH)_3}\) in \(NaOH\) solution
2 An aqueous solution of \(A{l_2}{(S{O_4})_3}\)
3 A molten mixture of \(A{l_2}{O_3}\) and \(N{a_3}Al{F_6}\)
4 A molten mixture of \(AlO(OH)\) and \(Al{(OH)_3}\)
Explanation:
In the commercial electrochemical process for aluminium extraction, the electrolyte used is .a molten mixture of \(Al _2 O _3\) (alumina) and \(Na _3 AIF _6\) (cryolite).
11. THE P-BLOCK ELEMENTS
189751
Which is correct oxidation state of lead
1 \(+ 2\), \(+ 4\)
2 \(+ 1\), \(+ 2\)
3 \(+ 3\), \(+ 4\)
4 \(4\)
Explanation:
Lead shows two types oxidation states \(+2\) oxidation state which is lower oxidation state due to inert pair effect(stable oxidation state for lead). \(+4\) oxidation state which is Higher oxidation state
11. THE P-BLOCK ELEMENTS
189683
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out in the presence of
1 \(NaCl\)
2 Fluorite
3 Cryolite which forms a melt with lower melting temperature
4 Cryolite which forms a melt with higher melting temperature
Explanation:
Hall and Heroult's process: \(2 Al _2 O _3+3 C \rightarrow 4 Al +3 O _2\) Cathode \(: Al ^{3+}(\) melt \()+3 e ^{-} \rightarrow Al (l)\) Anode \(: C ( s )+ O ^{2-}( g )(\) melt \() \rightarrow CO ( g )+2 e ^{-}\) \(C ( s )+2 O ^{2-}( g )(\text { melt }) \rightarrow CO _2( g )+4 e ^{-}\) The electrolysis of alumina by Hall and Heroult's process is carried by using a fused mixture of alumina \(\left( Al _2 O _3\right)\) and cryolite \(\left( Na _3 AlF _6\right.\), sodium hexafluoroaluminate) along with minor quantities of aluminum fluoride \(\left( AlF _3\right)\) and fluorspar \(\left( CaF _2\right)\). The addition of cryolite and fluorspar increases the electrical conductivity of alumina and lowers the fusion temperature.
