NCERT Exemplar Chemistry - Class 11>Chapter 11 - The p-Block Elements>Long Answer Type>Q 46

HARD

11th CBSE

IMPORTANT

Earn 100

Boron fluoride exists as ${BF}_{3}$ but boron hydride doesn’t exist as ${BH}_{3}$ . Give reason. In which form does it exist? Explain its structure.

Important Questions on The p-Block Elements

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 11 - The p-Block Elements>Long Answer Type>Q 47

What are silicones? State the uses of silicones.

MEDIUM

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 11 - The p-Block Elements>Long Answer Type>Q 47

What are boranes? Give chemical equation for the preparation of diborane.

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 11 - The p-Block Elements>Long Answer Type>Q 48

A compound

(A)

of boron reacts with

{NMe}_{3}

to give an adduct

(B)

which on hydrolysis gives a compound

(C)

and hydrogen gas. Compound

(C)

is an acid. Identify the compounds

A, B

and

C

. Give the reactions involved.

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 11 - The p-Block Elements>Long Answer Type>Q 49

A nonmetallic element of group

13

, used in making bulletproof vests is extremely hard solid of black colour. It can exist in many allotropic forms and has unusually high melting point. Its trifluoride acts as Lewis acid towards ammonia. The element exhibits maximum covalency of four. Identify the element and write the reaction of its trifluoride with ammonia. Explain why does the trifluoride act as a Lewis acid.

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 11 - The p-Block Elements>Long Answer Type>Q 50

A tetravalent element forms monoxide and dioxide with oxygen. When air is passed over heated element

(1273 K)

, producer gas is obtained. Monoxide of the element is a powerful reducing agent and reduces ferric oxide to iron. Identify the element and write formulas of its monoxide and dioxide. Write chemical equations for the formation of producer gas and reduction of ferric oxide with the monoxide.