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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Which of the following compound is weakest Lewis acid ?

(1) BF3

(2) BCl3

(3) BBr3

(4) BI3

Subtopic:  Boron Family- Preparations,Properties & Uses |
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Which does not show inert pair effect

(1) Al

(2) Sn

(3) Pb

(4) Thallium

Subtopic:  Boron Family- Preparations,Properties & Uses |
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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 |
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Mark the oxide which is amphoteric in character

(1) CO2

(2) CO

(3) SnO2

(4) CaO

Subtopic:   Structure & Properties of Allotropes of C |
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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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Which of the following shows correct Lewis acidic strength order of trihalides of boron ?

(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 |
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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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NEET 2021 - Achiever Batch - Aryan Raj Singh
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