Question

35 Which statements are correct for all three halogens, chlorine, bromine and iodine?
1 They all form hydrides that are strong acids in aqueous solution.
2 They all react with aqueous sodium hydroxide to form oxo-anions.
3 They all require one more electron to fill the p orbitals of their outer shells.

Ans : 1,2,3

Please explain :)

Answer 1

they are all true

Answer 2

Cl 1s2 2s2 2p6 3s2 3p5
Br:1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5
I: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p5
Statement 3 is correct it shows that all halogens require one electron to fill the p orbitals.

H+1/2Cl2-->HCL
H+1/2F2-->HF
H+1/2I2-->HI
All are strong acids, all of the listed hydrides can donate a H+ ion to a base.

The reaction of chlorine with cold sodium hydroxide solution
Definition: An oxyanion is an anion containing oxygen.

The reaction between chlorine and cold dilute sodium hydroxide solution
2NaOH+Cl2-->NaCl+NaClO+H2O

Answer 3

i don't think statement 1 is correct because hydrides are compounds that hydrogen bind to a electropositive element but halogens are not electropositive. is there any hydride of halogens? am i right @chmvijay ?

Answer 4

what do you think @Abhisar ?

Answer 5

HCl, do you know about this compound ?

Hydrogen binds with an electronegative element. All are true !

Answer 6

when you mention hydride that means hydrogen link to electropositive element not halogens. in hydrides electron density is dense around hydrogen but in HCl hydrogen hasn't dense electron density.

Answer 7

do you agree with me @Abhisar ?

Answer 8

Hydrides are referred to any element bonded to Hydrogen in the periodic table (exception noble gases)

Answer 9

HCl is a kind of Covalent Hydride

Answer 10

Yes i agree @Abmon98
`The term hydride is commonly named after binary compounds that hydrogen forms with other elements of the periodic table. Hydride compounds in general form with almost any element, except a few noble gases.`

Answer 11

but what i said is in wikipedia.com
i don't know maybe you are right.

Answer 12

Don't take wikipedia for granted !
It is not a reliable source, anyone can edit it.

Answer 13

is this definition is on a website? give me an address ?

Answer 14

Read this
http://goo.gl/neBw48

Answer 15

can you give a valid source?

Answer 16

http://goo.gl/4QlIW7
Britannica

Answer 17

i appreciate if you introduce me an reliable source.

Answer 18

The above link is for Britannica Encyclopedia. You can rely on it !