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All Physics Chemistry Botany Zoology

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H₃BO₃ is

monobasic and weak Lewis acid

monobasic and weak bronsted acid

monobasic and strong Lewis acid

tribasic and weak Bronsted acid

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Explanation

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:

H₃BO₃

[BH₂(NH₃)₂]+ [BH₄]-

B₂(CH₃)₆

NaBH₄

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Explanation

B_{2} H_{6} + 3 O_{2} \to B_{2} O_{3} + 3 H_{2} O + H e a t

B_{2} H_{6} + 6 H_{2} O \to H_{3} B O_{3} + 6 H_{2}

2 N a H + B_{2} H_{6} \to e t h e r N a B H_{4}

From

B_{2} H_{6}

, all can be prepared except

B_{2} (C H_{3})_{6}

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Which of the following shows correct Lewis acidic strength order of trihalides of boron ?

BCl₃ > BBr₃ > BF₃ > BI₃

BF₃ < BBr₃ < BCl₃ < BI₃

BF₃ < BCl₃ < BBr₃ < BI₃

BF₃ >BCl₃ > BBr₃ > BI₃

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Explanation

Extent of back bonding decreases from BF₃ to BI₃.

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The correct order of ease of hydrolysis is

CCl₄ < SiCl₄ < PCl₅ < AlCl₃

AlCl₃ < CCl₄ < PCl₅ < SiCl₄

CCl₄ < AlCl₃ < PCl₅ < SiCl₄

CCl₄ < AlCl₃ < SiCl₄ < PCl₅

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Explanation

except carbon ,rest r from 3rd period , which can extend their covalancy upto 6.

The hydrolysis increases with the increase in oxidation number.

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The number of carbon atoms per unit cell of diamond unit cell is:-

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Explanation

The diamond unit cell is a face-centered cubic (FCC) structure with 8 carbon atoms at the corners of the cube. Each carbon atom is shared by 8 neighboring cubes, so the total number of carbon atoms per unit cell is 8.

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Name the type of the structure of silicate in which one oxygen atom of [SiO₄]^4- is shared?

Sheet silicate

Pyrosilicate

three dimensional silicate

Linear chain silicate

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Which one of the following anions is present in chain structure silicates?

${Si}_{2} O_{7}^{6 -}$

$({Si}_{2} O_{5}^{2 -})_{n}$

$({Si}_{2} O_{6}^{2 -})_{n}$

${SiO}_{4}^{4 -}$

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Explanation

$[{SiO}_{3}^{2 -}]_{n}$ and $[{Si}_{4} O_{11}]^{6 -}$ have chain structure of silicates

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Anhydrous aluminum chloride $({Al}_{2} {Cl}_{6})$ is covalent compound and soluble in water giving:

${Al}^{3 +}$ and ${Cl}^{-} ions$

${[Al {(H_{2} O)}_{6}]}^{3 +}$ and ${Cl}^{-} ions$

${[{AlCl}_{2} {(H_{2} O)}_{4}]}^{+}$ and ${[{AlCl}_{4} {(H_{2} O)}_{2}]}^{-} ions$

none of the above

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Explanation

(c) ${AlCl}_{3} 6 H_{2} O \overset{dissociation}{\to} {[{AlCl}_{2} {(H_{2} O)}_{4}]}^{+} + {[{AlCl}_{4} {(H_{2} O)}_{2}]}^{-}$

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The silicate anion in the mineral kinote is a chain of three ${SiO}_{4}$ tetrahedra, that share corners with adjacent tetrahedra. The charge of the silicate anion is :

-4

-8

-6

-2

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${BX}_{3} + {NH}_{3} \overset{R . T .}{\to} {BX}_{3} . {NH}_{3} +$ Heat of adduct formation $(∆ H)$

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

${BF}_{3}$

${BCl}_{3}$

${BBr}_{3}$

${BI}_{3}$

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Explanation

(d) Lewis acidic strength : ${BF}_{3} < {BCl}_{3} < {BBr}_{3} < {BI}_{3}$

As ${BI}_{3}$ is strongest lewis acid among all boron halides therefore, heat of adduct formation will be

maximum numerically, for ${BI}_{3}$ .

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Yes. You can attempt every NEET question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.