IIT-JEE 2006 | p-Block Elements Question 71 | Chemistry

1

IIT-JEE 2006

MCQ (Single Correct Answer)

+3

-1

$$ \mathrm{B}(\mathrm{OH})_3+\mathrm{NaOH} \quad \mathrm{NaBO}_2+\mathrm{Na}\left[\mathrm{~B}(\mathrm{OH})_4\right] $$$+\mathrm{H}_2 \mathrm{O}$

How can this reaction be made to proceed in forward direction?

A

addition of cis -1,2-diol

B

addition of borax

C

addition of trans $-1,2-$ diol

D

addition of $\mathrm{Na}_2 \mathrm{HPO}_4$

2

IIT-JEE 2006

MCQ (Single Correct Answer)

+3

-0

$$ \text { Match the Column I with Column II : } $$

Column I		Column II
(A)	$$ \mathrm{Bi}^{3+} \rightarrow(\mathrm{BiO})^{+} $$	(P)	Heat
(B)	$$ \left[\mathrm{AlO}_2\right]^{-} \rightarrow \mathrm{Al}(\mathrm{OH})_3 $$	(Q)	Hydrolysis
(C)	$$ \mathrm{SiO}_4^{4-} \rightarrow \mathrm{Si}_2 \mathrm{O}_7^{6-} $$	(R)	Acidification
(D)	$$ \left(\mathrm{B}_4 \mathrm{O}_7^{2-}\right) \rightarrow\left[\mathrm{B}(\mathrm{OH})_3\right] $$	(S)	Dilution by water

A

$$ [\mathbf{A} \rightarrow(\mathbf{Q}, \mathrm{R}) ; \mathbf{B} \rightarrow(\mathbf{R}) ; \mathbf{C} \rightarrow(\mathbf{P}) ; \mathrm{D} \rightarrow(\mathrm{R})] .$$

B

$$ [\mathbf{A} \rightarrow(\mathbf{Q}, \mathrm{R}) ; \mathbf{B} \rightarrow(\mathbf{R}) ; \mathbf{C} \rightarrow(\mathbf{P}) ; \mathrm{D} \rightarrow(\mathrm{Q}, \mathrm{R})] .$$

C

$$ [\mathbf{A} \rightarrow(\mathbf{Q}) ; \mathbf{B} \rightarrow(\mathbf{R}) ; \mathbf{C} \rightarrow(\mathbf{P}) ; \mathrm{D} \rightarrow(\mathrm{Q})] .$$

D

$$ [\mathbf{A} \rightarrow(\mathbf{Q}) ; \mathbf{B} \rightarrow(\mathbf{R}) ; \mathbf{C} \rightarrow(\mathbf{P}) ; \mathrm{D} \rightarrow(\mathrm{Q}, \mathrm{R})] .$$

3

IIT-JEE 2002 Screening

MCQ (Single Correct Answer)

+2

-0.5

Specify the coordination geometry around and hybridisation of N and B atoms in a 1 : 1 complex of BF₃ and NH₃

A

N : tetrahedral, sp³; B : tetrahedral, sp³

B

N : pyramidal, sp³; B : pyramidal, sp³

C

N : pyramidal, sp³; B : planar, sp²

D

N : pyramidal, sp³; B : tetrahedral, sp³

4

IIT-JEE 1999

MCQ (Single Correct Answer)

+2

-0.5

The oxidation number of sulphur in S₈,S₂F₂,H₂S respectively, are

A

0, +1 and -2

B

+2, +1 and -2

C

0, +1 and +2

D

-2, +1 and -2

JEE Advanced Subjects