P-Block Elements Group 13 to 18-Group 13 (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Chemistry): Questions 1 - 5 of 7

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Question number: 1

» P-Block Elements Group 13 to 18 » Group 13 » Boron

Appeared in Year: 2013

MCQ▾

Question

In the structure of borax, the number of boron atoms and B-O-B units, respectively are

Choices

Choice (4) Response
a.

4 and 3

b.

5 and 4

c.

5 and 3

d.

4 and 5

Question number: 2

» P-Block Elements Group 13 to 18 » Group 13 » Boron

Appeared in Year: 2013

MCQ▾

Question

Hydrolysis of BCl3 gives X which on treatment with sodium carbonate produced Y. X and Y respectively are

Choices

Choice (4) Response
a.

H3BO3andNa2B4O7

b.

H3BO3andNaBO2

c.

B2O3andNaBO2

d.

B2O3andNa2B4O7

Question number: 3

» P-Block Elements Group 13 to 18 » Group 13 » Boron

MCQ▾

Question

The correct formula of borax is

Choices

Choice (4) Response
a.

Na2B4O74H2O

b.

Na2[B4O5(OH)4]H2O

c.

Na2[B4O5(OH)4]8H2O

d.

Na2B4O78H2O

Question number: 4

» P-Block Elements Group 13 to 18 » Group 13 » Boron

MCQ▾

Question

The Structure of diborane ( B2H6 ) contains

Choices

Choice (4) Response
a.

Four 2c2e bonds and two 3c2e bond

b.

Four 2c2e bonds and four 3c2e bond

c.

Two 2c2e bonds and four 3c2e bond

d.

Two 2c2e bonds and two 3c3e bond

Question number: 5

» P-Block Elements Group 13 to 18 » Group 13 » Boron

MCQ▾

Question

The stability of + 1 oxidation state increases in the sequence

Choices

Choice (4) Response
a.

In<Tl<Ga<Al

b.

Al<Ga<In<Tl

c.

Tl<In<Ga<Al

d.

Ga<In<Al<Tl

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