13th Group

Question 1

Which prop of 13G ⬆️ down the group?

Answer 1

Density, Ionic and covalent radii, stability

Question 2

Which prop ⬇️ down the group?

Answer 2

BP

Question 3

Name the 13thG elements?

Answer 3

B, Al, Ga, In, Tl

Question 4

Atomic radius and reason

Answer 4

B<Ga<Al<In<Tl
Poor screening of 3d10 electron
⬆️

Question 5

EN

Answer 5

Al<Ga<In<Tl<B
⬆️

Question 6

MP

Answer 6

B>Al>Tl>In>Ga
B- strong crystalline lattice
⬇️

Question 7

IE

Answer 7

B>Tl>Ga>Al>In
Trick: Bombay to goa all are indian

Question 8

OS

Answer 8

+3, +1

Question 9

Which is acidic? Amphoteric? Basic?

Answer 9

Acidic- B
Amphoteric- Al, Ga
Basic- In, Tl

Question 10

E+ O2 gives

Answer 10

E2O3

Question 11

E+N2 gives

Answer 11

EN

Question 12

Which element does not react in crystalline form?

Answer 12

B

Question 13

Which element forms thin oxide layer?

Answer 13

Al
Al2O3

Question 14

Which Amorphous elements forms oxides and nitrides

Answer 14

B and Al

Question 15

Which element doesn’t react with halogen?

Answer 15

Tl

Question 16

How is B occured in nature?

Answer 16

H3BO3- Orthoboric acid
Na2B4O7. 10H20- borax
Na2B4O7. 4H20- Kernite
Al203. 2H20- Bauxite
Na3AlF6-Cryolite

Question 17

Occurence order

Answer 17

O>Si>Al

Question 18

Acidic strength?

Answer 18

F<Cl<Br<I

Question 19

Isotopes of B

Answer 19

10B and 11B(81%)

Question 20

Bcl3 and Alcl3 acts as Lewis acid because?

Answer 20

Incomplete octet

Question 21

Complex formation is due to:

Answer 21

Small size, high charge density, available of d orbital

Question 22

Which element have very low MP and high BP

Answer 22

Ga

Question 23

Which element have high MP and is hard

Answer 23

B