Which loses weight on exposure to the atmosphere ?

1. Concentrated H2SO4

2. Solid NaOH

3. A saturated solution of CO2

4. Anhydrous sodium carbonate

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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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 |
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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 |
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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 |
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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 |
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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 |
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BX3+NH3R.T.BX3 .NH3+ Heat of adduct formation H

The numerical value of H is found to be maximum for :

(1) BF3                               

(2) BCl3

(3) BBr3                             

(4) BI3

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Borax is converted into crystalline boron by the following steps:

          BoraxXH3BO3B2O3YB

X and Y are respectively :

1. HCl, Mg                                 
2. HCl, C
3. C, Al 
4. HCl, Al

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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The dissolution of Al(OH)3 in a solution of NaOH results in the formation of -

1. AlH2O4OH2+       

2. AlH2O3OH3

3. AlH2O2OH4-     

4. AlH2O6OH3

Subtopic:  Boron Family- Preparations, Properties & Uses |
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