Pick the correct statement :

(1) Borax is white crystalline solid containing [B4O5(OH)4]2- units

(2) Aqueous solution of borax is acidic in nature.

(3) Cobalt gives green colour in borax bead test.

(4) All are incorrect.

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 51%
From NCERT
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An amphoteric  oxide among the following is-

1. CO2

2. CO

3. SnO2

4. CaO

Subtopic:  Properties of Glass, Pb & Sn compounds |
 82%
From NCERT
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In B2H6 

(1) there is direct boron-boron bond

(2) the structure is similar to that of C2H6

(3) the boron atoms are linked through hydrogen bridges

(4) all the atoms are in one plane

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 82%
From NCERT
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From the B2H6 all the following can be prepared except:

(1) H3BO3

(2) [BH2(NH3)2]+ [BH4]-

(3) B2(CH3)6

(4) NaBH4

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 59%
From NCERT
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The correct order of Lewis acid strength of trihalides of boron is:

1. BCl3 > BBr3 > BF3 > BI3

2. BF3 < BBr3 < BCl3 < BI3

3. BF3 < BCl3 < BBr3 < BI3

4. BF3 >BCl3 > BBr3 > BI3

Subtopic:  Boron Family- Preparations, Properties & Uses |
 65%
From NCERT
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The correct order of ease of hydrolysis is :

1. CCl4 < SiCl4 < PCl5 < AlCl3

2. AlCl3 < CCl4 < PCl5 < SiCl4

3. CCl4 < AlCl3 < PCl5 < SiCl4

4. CCl4 < AlCl3 < SiCl4 < PCl5

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
From NCERT
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The element among the following that does not show inert pair effect is-

1. Al 2. Sn
3. Pb 4. Thallium
Subtopic:  Boron Family- Preparations, Properties & Uses |
 75%
From NCERT
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Which of the following compound is weakest Lewis acid ?

(1) BF3

(2) BCl3

(3) BBr3

(4) BI3

Subtopic:  Boron Family- Preparations, Properties & Uses |
 68%
From NCERT
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It is because inability of ns2 electrons of the valence shell to participate in bonding that

1. Sn2+ is reducing while Pb4+ is oxidising agent

2. Sn2+ is oxidising while Pb4+ is reducing agent

3. Sn2+ and Pb2+ are both oxidising and reducing agent

4. Sn4+ is reducing while Pb4+ is oxidising agent

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 65%
NEET - 2017
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The number of carbon atoms per unit cell of diamond unit cell is:-

1. 4

2. 8

3. 6

4. 1

Subtopic:  Carbon Family - Preparations, Properties & Uses |  Structure & Properties of Allotropes of C |
From NCERT
NEET - 2013
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