p-Block (17 and 18)

Question 1

Carnallite?

Answer 1

KCl.MgCl2·6(H2O)

Question 2

Chile saltpetre contains upto ___% of sodium iodate

Answer 2

0.2

Question 3

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.

Answer 3

outer

Question 4

Bromine and iodine is soluble in

Answer 4

CCl3, CCl4, CS2, hydrocarbons

Question 5

Fluorine electronegative because? Fluorine only exhibits the oxidation state ____

Answer 5

High hydration enthalpy
low dissociation enthalpy

-1

Question 6

I– can be reduced by oxygen in an acidic medium;

just the reverse of the reaction observed with fluorine. True or False?

Answer 6

False

it can be oxidised

Question 7

Hydrogen halides m.p and b.p order

Answer 7

m. p: HCl < HBr < HF < HI

b. p: HCl < HBr < HI < HF

Question 8

Stability of halogen oxides

Answer 8

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

Question 9

_____ is used in estimation for CO

Answer 9

I2O5

Question 10

More covalent halides of U, Sn, Sb, Pb

Answer 10

UF6, SnCl4, SbCl5, PbCl4

Question 11

Chlorine was discovered in ________ by __________ by mixing _____ and ______

In _____, ______ suggested the name chlorine

Answer 11

1774, Scheele, HCl and MnO2

1810, Davy

Question 12

3 preps of chlorine

Manufacture of chlorine

Answer 12

1. MnO2 + HCl, MnO2 + NaCl + H2SO4, KMnO4 + HCl

2. Deacon process (HCl + O2 cucl2), electrolysis – Cl2 at anode

Question 13

H2S + Cl2 —->

Answer 13

S

Question 14

__________ discovered HCl in ________–

Answer 14

Glauber, 1648

Question 15

Prep of HCl?

Aqua regia ratio?

Answer 15

Similar to Solvay Process

HCl to HNO3 —> 3:1

Question 16

When HCl reacts with finely powdered iron, it forms ferrous chloride and not ferric chloride. Why?

Answer 16

Its reaction with iron produces H2.

Question 17

Interhalogen compounds magnetic nature? Their mp and bp are? Halogen more reactive than interhalogen compounds?

Answer 17

diamagnetic. higher than the individual halogens

fluorine

Question 18

Minerals in which neon is formed

Answer 18

pitchblende, monazite, cleveite

Question 19

Oganesson has been synthetically produced by collision of?

Half life?

Answer 19

249 98 Cf atoms and 48 20Ca ions

0.7 ms

Question 20

Neil Barett in the year _______ as the compound ____

Answer 20

1962

O2PtF6

Question 21

XeF2 hydrolyse easily to give
XeF4 hydrolyze to give
XeF6 hydrolyze to give

Answer 21

Xe + HF + O2
XeO3 + HF + O2
XeO3 + HF

Question 22

Partial hydrolysis of XeF6

Answer 22

XeOF4

XeO2F2

Question 23

_____(xenon compound) is an explosive solid. _____ is a colourless volatile liquid

Answer 23

XeO3

XeOF4