QBManager

CHXI11:THE P-BLOCK ELEMENTS

316906 Which of the following is a Lewis acid ?

1

{AlCl}_{3}

2

{MgCl}_{2}

3

{CaCl}_{2}

4

{BaCl}_{2}

CHXI11:THE P-BLOCK ELEMENTS

316909 Aluminium is extracted from alumina $({Al}_{2} O_{3})$ by electrolysis of molten mixture of

1

{Al}_{2} O_{3} + {Na}_{3} {AlF}_{6} + {CaF}_{2}

2

{Al}_{2} O_{3} + KF + {Na}_{3} {AlF}_{6}

3

{Al}_{2} O_{3} + HF + {NaAlF}_{4}

4

{Al}_{2} O_{3} + {CaF}_{2} + {NaAlF}_{4}

Explanation:

Extraction of $Al$ from ${Al}_{2} O_{3}$ is made by electrolytic reduction of molten mixture of alumina $({Al}_{2} O_{3})$ , cryolite $({Na}_{3} {AlF}_{6})$ and fluorspar ${CaF}_{2}$ .

CHXI11:THE P-BLOCK ELEMENTS

316910 Aluminium deposited as vapours on glass forms a good mirror, essentially because:

1 It has better shine than

Ag

2 It does not scratch

3 Coating is much smoother

4 It does not tarnish in air

CHXI11:THE P-BLOCK ELEMENTS

316911 The complex formed when ${Al}_{2} O_{3}$ is leached from bauxite using concentrated $NaOH$ solution is

1

Na [Al (OH)_{4}]

2

{NaAl}_{2} O_{4}

3

{Na}_{2} [Al (OH)_{3}]

4

{Na}_{2} {AlO}_{2}

Explanation:

${Al}_{2} O_{3} + 2 NaOH + 3 H_{2} O \to \underset{Sodium meta aluminate}{2 Na [Al (OH)_{4}]}$

KCET - 2016

CHXI11:THE P-BLOCK ELEMENTS

316912 Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because

1 Oxygen forms a protective oxide layer on aluminium

2 Aluminium is a noble metal

3 Iron undergoes reaction easily with water

4 Iron forms tri and divalent ions

CHXI11:THE P-BLOCK ELEMENTS

316906 Which of the following is a Lewis acid ?

1

{AlCl}_{3}

2

{MgCl}_{2}

3

{CaCl}_{2}

4

{BaCl}_{2}

CHXI11:THE P-BLOCK ELEMENTS

316909 Aluminium is extracted from alumina $({Al}_{2} O_{3})$ by electrolysis of molten mixture of

1

{Al}_{2} O_{3} + {Na}_{3} {AlF}_{6} + {CaF}_{2}

2

{Al}_{2} O_{3} + KF + {Na}_{3} {AlF}_{6}

3

{Al}_{2} O_{3} + HF + {NaAlF}_{4}

4

{Al}_{2} O_{3} + {CaF}_{2} + {NaAlF}_{4}

Explanation:

Extraction of $Al$ from ${Al}_{2} O_{3}$ is made by electrolytic reduction of molten mixture of alumina $({Al}_{2} O_{3})$ , cryolite $({Na}_{3} {AlF}_{6})$ and fluorspar ${CaF}_{2}$ .

CHXI11:THE P-BLOCK ELEMENTS

316910 Aluminium deposited as vapours on glass forms a good mirror, essentially because:

1 It has better shine than

Ag

2 It does not scratch

3 Coating is much smoother

4 It does not tarnish in air

CHXI11:THE P-BLOCK ELEMENTS

316911 The complex formed when ${Al}_{2} O_{3}$ is leached from bauxite using concentrated $NaOH$ solution is

1

Na [Al (OH)_{4}]

2

{NaAl}_{2} O_{4}

3

{Na}_{2} [Al (OH)_{3}]

4

{Na}_{2} {AlO}_{2}

Explanation:

${Al}_{2} O_{3} + 2 NaOH + 3 H_{2} O \to \underset{Sodium meta aluminate}{2 Na [Al (OH)_{4}]}$

KCET - 2016

CHXI11:THE P-BLOCK ELEMENTS

316912 Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because

1 Oxygen forms a protective oxide layer on aluminium

2 Aluminium is a noble metal

3 Iron undergoes reaction easily with water

4 Iron forms tri and divalent ions

CHXI11:THE P-BLOCK ELEMENTS

316906 Which of the following is a Lewis acid ?

1

{AlCl}_{3}

2

{MgCl}_{2}

3

{CaCl}_{2}

4

{BaCl}_{2}

CHXI11:THE P-BLOCK ELEMENTS

316909 Aluminium is extracted from alumina $({Al}_{2} O_{3})$ by electrolysis of molten mixture of

1

{Al}_{2} O_{3} + {Na}_{3} {AlF}_{6} + {CaF}_{2}

2

{Al}_{2} O_{3} + KF + {Na}_{3} {AlF}_{6}

3

{Al}_{2} O_{3} + HF + {NaAlF}_{4}

4

{Al}_{2} O_{3} + {CaF}_{2} + {NaAlF}_{4}

Explanation:

Extraction of $Al$ from ${Al}_{2} O_{3}$ is made by electrolytic reduction of molten mixture of alumina $({Al}_{2} O_{3})$ , cryolite $({Na}_{3} {AlF}_{6})$ and fluorspar ${CaF}_{2}$ .

CHXI11:THE P-BLOCK ELEMENTS

316910 Aluminium deposited as vapours on glass forms a good mirror, essentially because:

1 It has better shine than

Ag

2 It does not scratch

3 Coating is much smoother

4 It does not tarnish in air

CHXI11:THE P-BLOCK ELEMENTS

316911 The complex formed when ${Al}_{2} O_{3}$ is leached from bauxite using concentrated $NaOH$ solution is

1

Na [Al (OH)_{4}]

2

{NaAl}_{2} O_{4}

3

{Na}_{2} [Al (OH)_{3}]

4

{Na}_{2} {AlO}_{2}

Explanation:

${Al}_{2} O_{3} + 2 NaOH + 3 H_{2} O \to \underset{Sodium meta aluminate}{2 Na [Al (OH)_{4}]}$

KCET - 2016

CHXI11:THE P-BLOCK ELEMENTS

316912 Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because

1 Oxygen forms a protective oxide layer on aluminium

2 Aluminium is a noble metal

3 Iron undergoes reaction easily with water

4 Iron forms tri and divalent ions

CHXI11:THE P-BLOCK ELEMENTS

316906 Which of the following is a Lewis acid ?

1

{AlCl}_{3}

2

{MgCl}_{2}

3

{CaCl}_{2}

4

{BaCl}_{2}

CHXI11:THE P-BLOCK ELEMENTS

316909 Aluminium is extracted from alumina $({Al}_{2} O_{3})$ by electrolysis of molten mixture of

1

{Al}_{2} O_{3} + {Na}_{3} {AlF}_{6} + {CaF}_{2}

2

{Al}_{2} O_{3} + KF + {Na}_{3} {AlF}_{6}

3

{Al}_{2} O_{3} + HF + {NaAlF}_{4}

4

{Al}_{2} O_{3} + {CaF}_{2} + {NaAlF}_{4}

Explanation:

Extraction of $Al$ from ${Al}_{2} O_{3}$ is made by electrolytic reduction of molten mixture of alumina $({Al}_{2} O_{3})$ , cryolite $({Na}_{3} {AlF}_{6})$ and fluorspar ${CaF}_{2}$ .

CHXI11:THE P-BLOCK ELEMENTS

316910 Aluminium deposited as vapours on glass forms a good mirror, essentially because:

1 It has better shine than

Ag

2 It does not scratch

3 Coating is much smoother

4 It does not tarnish in air

CHXI11:THE P-BLOCK ELEMENTS

316911 The complex formed when ${Al}_{2} O_{3}$ is leached from bauxite using concentrated $NaOH$ solution is

1

Na [Al (OH)_{4}]

2

{NaAl}_{2} O_{4}

3

{Na}_{2} [Al (OH)_{3}]

4

{Na}_{2} {AlO}_{2}

Explanation:

${Al}_{2} O_{3} + 2 NaOH + 3 H_{2} O \to \underset{Sodium meta aluminate}{2 Na [Al (OH)_{4}]}$

KCET - 2016

CHXI11:THE P-BLOCK ELEMENTS

316912 Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because

1 Oxygen forms a protective oxide layer on aluminium

2 Aluminium is a noble metal

3 Iron undergoes reaction easily with water

4 Iron forms tri and divalent ions

CHXI11:THE P-BLOCK ELEMENTS

316906 Which of the following is a Lewis acid ?

1

{AlCl}_{3}

2

{MgCl}_{2}

3

{CaCl}_{2}

4

{BaCl}_{2}

CHXI11:THE P-BLOCK ELEMENTS

316909 Aluminium is extracted from alumina $({Al}_{2} O_{3})$ by electrolysis of molten mixture of

1

{Al}_{2} O_{3} + {Na}_{3} {AlF}_{6} + {CaF}_{2}

2

{Al}_{2} O_{3} + KF + {Na}_{3} {AlF}_{6}

3

{Al}_{2} O_{3} + HF + {NaAlF}_{4}

4

{Al}_{2} O_{3} + {CaF}_{2} + {NaAlF}_{4}

Explanation:

Extraction of $Al$ from ${Al}_{2} O_{3}$ is made by electrolytic reduction of molten mixture of alumina $({Al}_{2} O_{3})$ , cryolite $({Na}_{3} {AlF}_{6})$ and fluorspar ${CaF}_{2}$ .

CHXI11:THE P-BLOCK ELEMENTS

316910 Aluminium deposited as vapours on glass forms a good mirror, essentially because:

1 It has better shine than

Ag

2 It does not scratch

3 Coating is much smoother

4 It does not tarnish in air

CHXI11:THE P-BLOCK ELEMENTS

316911 The complex formed when ${Al}_{2} O_{3}$ is leached from bauxite using concentrated $NaOH$ solution is

1

Na [Al (OH)_{4}]

2

{NaAl}_{2} O_{4}

3

{Na}_{2} [Al (OH)_{3}]

4

{Na}_{2} {AlO}_{2}

Explanation:

${Al}_{2} O_{3} + 2 NaOH + 3 H_{2} O \to \underset{Sodium meta aluminate}{2 Na [Al (OH)_{4}]}$

KCET - 2016

CHXI11:THE P-BLOCK ELEMENTS

316912 Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because

1 Oxygen forms a protective oxide layer on aluminium

2 Aluminium is a noble metal

3 Iron undergoes reaction easily with water

4 Iron forms tri and divalent ions

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Question Bank Series

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation: