Which one of the following has the highest melting point?

1. Na

2. Mg

3. K

4. Al

Subtopic:  Boron Family- Preparations, Properties & Uses |
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B(OH)3 + NaOH   NaBO2 + Na[B(OH)4] +H2O

How can this reaction is made to proceed in forward direction?

1. addition of cis 1,2 diol

2. addition of borax

3. addition of trans 1,2 diol

4. addition of Na2HPO4

Subtopic:  Anomalous Behaviour of B & C |
 51%
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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%
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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%
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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%
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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%
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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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Which of the following cation can not give borax bead test?

(a) Cr3+                          (b) Co2+

(c) Ag+                           (d) Mn2+

Subtopic:  d-Block Elements- Properties & Uses |
 74%
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Aluminium becomes passive in nitric acid because it-

1. Is a noble metal

2. Forms a thin film of oxide

3. Has a positive reduction potential

4.  None of the above

Subtopic:  Boron Family- Preparations, Properties & Uses |
 92%
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Hybridisation of boron in diborane is:

1.  sp

2.  sp2

3.  sp3

4.  sp3d2

Subtopic:  Boron Family- Preparations, Properties & Uses |
 72%
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