NEET Chemistry The p-Block Elements (XI) Questions Solved


Which loses weight on exposure to the atmosphere ?

(a) Concentrated H2SO4

(b) Solid NaOH

(c) A saturated solution of CO2

(d) Anhydrous sodium carbonate

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(c) CO2 escapes out slowly.

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Which of the following compound is weakest Lewis acid ?

(1) BF3

(2) BCl3

(3) BBr3

(4) BI3

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(1) Extent of back bonding decreases from BF3 to BI3. So, lewis acidic character increases from BF3 to BI3. Hence, BF3 is the weakest lewis acid.

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Which does not show inert pair effect

(1) Al

(2) Sn

(3) Pb

(4) Thallium

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(1) Al does not show inert pair effect due to unavailability of d subshell.

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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.

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

Aqueous solution of borax is alkaline in nature. Cobalt gives blue colour borax bead test. 

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Mark the oxide which is amphoteric in character

(1) CO2

(2) CO

(3) SnO2

(4) CaO

(3)

CO2 - acidic,

CO - neutral,

SnO2 - amphoteric,

CaO - basic

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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

(3) Fact

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H3BO3 is

(1) monobasic and weak Lewis acid

(2) monobasic and weak bronsted acid

(3) monobasic and strong Lewis acid

(4) tribasic and weak Bronsted acid

(1) H3BO3 is not a protonic acid. It can accept one OH- and converted into [B(OH)4]-. So, it is a weak monobasic lewis acid.

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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

(1) Fact

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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

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(3) Extent of back bonding decreases from BF3 to BI3.

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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

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(4) Fact

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