The correct statements among I to III regarding group 13 element oxides are:
(I) Boron trioxide or diboron trioxide is acidic.
(II) Oxides of aluminium and gallium are amphoteric.
(III) Oxides of indium and thallium are basic.
1. (I) and (II) only
2. (I) and (III) only
3. (II) and (III) only
4. (I), (II), and (III) only

Subtopic:  Boron Family- Preparations, Properties & Uses |
 84%
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Statement I: Both carbon and silicon atoms belong to group 14, both CO2 and SiO2 are gases and linear molecules.
Statement II: Being electron deficient due to an incomplete octet of the central atom, both BCl3 and AlCl3 behave as Lewis acids.
 
1. Both statements I and  II are correct.
2. Both statements I and II are incorrect.
3. Statement I is correct but statement II is incorrect.
4. Statement I is incorrect but statement II is correct.
Subtopic:  Boron Family- Preparations, Properties & Uses | Properties of Structure of SiO2 & Other Compounds |
 52%
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One group of elements in the periodic table contains, in descending order, boron, aluminium, gallium, indium, and thallium. Which of the following are correct about these elements?

a. Indium forms the oxide  In2O3
b. Boron is the least reactive element in the group
c. Gallium forms the sulphate GaSO4


1. a only

2. a and b

3. a and c

4. b and c

Subtopic:  Boron Family- Preparations, Properties & Uses |
 56%
From NCERT
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Match the species given in Column I with properties given in Column II.

Column I          Column II
A. Diborane 1. Used as a flux for soldering metals
B.  Quartz 2. Crystalline form of silica
C. Borax 3. Banana bonds
D. Aluminosilicate 4. Used as a catalyst in petrochemical industries
Codes
A B C D
1. 3 4 1 2
2. 1 2 3 4
3. 3 2 1 4
4. 4 1 3 2
Subtopic:  Boron Family- Preparations, Properties & Uses |
 71%
From NCERT
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Match the species given in Column I with the properties mentioned in Column II.

Column I          Column II
A.  \(\text{BF}^-_4\) 1. Oxidation state of the central atom is +4
B.  AlCl3 2. Tetrahedral shape
C.  SnO 3. Lewis acid
D.  PbO2 4. Can be further oxidized

Codes

A B C D
1. 2 3 4 1
2. 1 2 3 4
3. 1 4 3 2
4. 4 1 3 2
Subtopic:  Boron Family- Preparations, Properties & Uses |
 84%
From NCERT
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