p-Block (17 and 18) Flashcards
Carnallite?
KCl.MgCl2·6(H2O)
Chile saltpetre contains upto ___% of sodium iodate
0.2
All halogens are coloured. This is due to absorption of radiations in visible region which results in the excitation of________ electrons to higher energy level.
outer
Bromine and iodine is soluble in
CCl3, CCl4, CS2, hydrocarbons
Fluorine electronegative because? Fluorine only exhibits the oxidation state ____
High hydration enthalpy
low dissociation enthalpy
-1
I– can be reduced by oxygen in an acidic medium;
just the reverse of the reaction observed with fluorine. True or False?
False
it can be oxidised
Hydrogen halides m.p and b.p order
m. p: HCl < HBr < HF < HI
b. p: HCl < HBr < HI < HF
Stability of halogen oxides
I > Cl > Br
Higher polarisibility of I and O bond
multiple bond formation between chlorine and oxygen takes place due to availability of d–orbitals leads to increase in stability
_____ is used in estimation for CO
I2O5
More covalent halides of U, Sn, Sb, Pb
UF6, SnCl4, SbCl5, PbCl4
Chlorine was discovered in ________ by __________ by mixing _____ and ______
In _____, ______ suggested the name chlorine
1774, Scheele, HCl and MnO2
1810, Davy
3 preps of chlorine
Manufacture of chlorine
- MnO2 + HCl, MnO2 + NaCl + H2SO4, KMnO4 + HCl
2. Deacon process (HCl + O2 cucl2), electrolysis – Cl2 at anode
H2S + Cl2 —->
S
__________ discovered HCl in ________–
Glauber, 1648
Prep of HCl?
Aqua regia ratio?
Similar to Solvay Process
HCl to HNO3 —> 3:1
When HCl reacts with finely powdered iron, it forms ferrous chloride and not ferric chloride. Why?
Its reaction with iron produces H2.
Interhalogen compounds magnetic nature? Their mp and bp are? Halogen more reactive than interhalogen compounds?
diamagnetic. higher than the individual halogens
fluorine
Minerals in which neon is formed
pitchblende, monazite, cleveite
Oganesson has been synthetically produced by collision of?
Half life?
249 98 Cf atoms and 48 20Ca ions
0.7 ms
Neil Barett in the year _______ as the compound ____
1962
O2PtF6
XeF2 hydrolyse easily to give
XeF4 hydrolyze to give
XeF6 hydrolyze to give
Xe + HF + O2
XeO3 + HF + O2
XeO3 + HF
Partial hydrolysis of XeF6
XeOF4
XeO2F2
_____(xenon compound) is an explosive solid. _____ is a colourless volatile liquid
XeO3
XeOF4
