COMPOUDS OF S BLOCK

Question 1

GIVE THE PREPARATION OF OXIDES

Answer 1

Na+O2=Na2O
Na2O3/NaNO2/NaNO3+Na=Na2O + N2(IN CASE OF NaNO2 & NaNO3)
KNO3+K=K2O+N2
MgCO3=HEATING=MgO+CO2
CaCO3=HEATING=CaO+CO2

Question 2

Na2O+H2O=
NA2O=(HEATING)=
K2O+H2O=
CaO+CO2/SiO2=
CaO+H2O=

Answer 2

NaOH
Na2O2+Na
KOH
CaCO2/CaSiO3
Ca(OH)2[SLAKED LIME]

Question 3

PREPARATION OF PEROXIDES

Answer 3

Na+O2=Na2O2
K+O2=K2O2
Mg(OH)/Ca(OH)2+H2O2=MgO2/CaO2

Question 4

Na2O2+H2O=(O C)=
Na2O2+H2O=(25C)=
Na2O2+H2SO4=
Na2O2+CO2=

Answer 4

Na2O2+H2O=(O C)=NaOH+H2O2
Na2O2+H2O=(25C)=NaOH+O2
Na2O2+H2SO4=Na2SO4+H2O2
Na2O2+CO2=Na2CO3+O2

Question 5

REACTION OF SUPEROXIDES
OF KO2 RbO2 AND CsO2
KO2+H2O=

Answer 5

KO2+H2O=KOH+O2+H2O2

Question 6

OTHER COMPOUNDS WITH O2

PREPARATION OF K2O2 AND K2O3
AND
KO3

Answer 6

K+O2=K2O3+O2=K2O3

KOH+O3=KO3

Question 7

HYDROXIDES

PREPING OF HaOH BY ELECTROLYSIS AND GOSSAGE METHID

Answer 7

ELECTROLYSIS OF NACL
GOSSAGE METHOD
Na2CO3+Ca(OH)2=NaOH+CaCO3

Question 8

NH4Cl+NaOH=
CO2+NaOH=
Zn/Al+NaOH=  +NaOH
P4+NaOH=
S+NaOH=
X2+NaOH=(COLD)=
X2+NaOH=(HOT)=
(WHERE X=Cl,Br,I)

Answer 8

NH4Cl+NaOH=
CO2+NaOH=
Zn/Al+NaOH=Zn(OH)2/Al(OH)3
P4+NaOH=PH3+NaH2PO2
S+NaOH=Na2S+Na2S2O3
X2+NaOH=(COLD)=NaX+NaOX
X2+NaOH=(HOT)=NaX+NaXO3 
(WHERE X=Cl,Br,I)

Question 9

PREPARATION OF HYDROXIDES OF K,Ca,Mg

Answer 9

ELECTROLYSIS OF KCl
CaO+H2O=Ca(OH)2
MgSO4/MgCl2+NaOH=Na2SO4/NaCl+Mg(OH)2

Question 10

PROPERTIES OF HYDROXIDE OF K,Ca,Mg

Answer 10

IN ABSORPTION OF CO2, KOH IS PREFERRED OVER NaOH AS KHCO3 IS SOLUBLE &NaHCO3 IS PARTIALLY SOLUBLE

Ca(OH2)+CO2=CaCO3(LIME WATER MILKY TEST)

Mg(OH)2+NH4Cl=MgCl2+NH4OH=(HEATING)=NH2
Mg(OH)2=(HEATING)=MgO+H2O

Question 11

PREPARATION OF CARBONATES OF Na,K,Mg,Ca

Answer 11

Na 
1)SOLVAY PROCESS: NH3+H2O+CO2=NH4HCO3
NaCl+NH4HCO3=NaHCO3+NH4Cl
2NaHCO3=(HEATING)=Na2CO3+H2O+CO2
2)Le-Blanc PROCESS
NaCl+H2SO4=NaHSO4+HCl
NaCL+NaHSO4=Na2SO4 HCl
Na2SO4+C=Na2S+CO
Na2S+CaCO3=Na2CO3+CaS
K
Le-Blanc's PROCESS
Mg
MgCl2/MgSO4 + NaHCO3=HEATING=MgCO3.Mg(OH)2.3H2O
Ca
CaCl2+(NH4)2CO3=CaCO3+NH4Cl

Question 12

Na2CO3+2HCl=
Na2CO3+H2O+CO2=
Na2CO3+Ca(OH)2=
CaCO3=(HEATING)=
CaCO3+H2O+CO2=

Answer 12

Na2CO3+2HCl=NaCl+H2O+6O2
Na2CO3+H2O+CO2=2NaHCO3
Na2CO3+Ca(OH)2=NaOH+CaCO3
CaCO3=(HEATING)=CaO+CO2
CaCO3+H2O+CO2=(BOILING)=Ca(HCO3)2
PROP OF CaCO3 IS SIMILAR TO PROP OF MgCO3
PROP OF K2CO3 IS SIMILAR TO Na2CO3

Question 13

PREPARATION OF Na,K,Mg,Ca

Answer 13

Na2CO3+H2O+CO2=HEATING=NaHCO3
K2CO3+H2O+CO2=HEATING=KHCO3
MgCO3+H2O+CO2=Mg(HCO3)2
CaCO3+H2O+CO2=Ca(HCO3)2

Question 14

PREPARATION OF NaCl,KCl,MgCl2,CaCl2

Answer 14

FROM BRINE(25% NaCl SOLN)
PREPARED FROM CARNALITE [2KCl.MgCl2.6H2O]
MgCO3+HCl=MgCl2+H2O+CO2
1)CaCO3+HCl=CaCl2+H2O+CO2
2)BY-PRODUCT OF SOLVAY PROCESS

Question 15

PROPERTIES OF CHLORIDES OF Na,K,Mg,Ca

Answer 15

NaCl=FREEZING MIXT IN LAB
IN PURE FORM IT IS NON HYGROSCOPIC BUT IN PRECENCE OF MgCl2 IT IS HYGROSCOPIC
KCl
USED AS FERTILIZER
MgCl2
MgCl2.6H2O=HEATING=Mg(OH)2+6HCl
MgCl2.6H2O=DRY HCl=MgCl2
MgO+MgCl2
 CaCl2
CaCl2.6H2O=HEATING=CaO+HCl
CaCl2.6H2O=DRY HCl=CaCl2

Question 16

PREPARATION OF SULPHATES OF Na,K,Mg

Answer 16

NaCl+H2SO4=Na2SO4+HCl
[<31]Na2SO4.10H2O(GLAUBER'S SALT)
[>32] Na2SO4(ANHYDROUS)
MgSO4.H2O=BOILING=MgSO4.7H2O 
MgCO3+H2SO4=MgSO4+H2O+CO2

Question 17

PROPERTIES OF NA2SO4

Answer 17

Na2SO4+C=Na2S+CO

Question 18

GYPSUM, POP REACTION OF CASO4

Answer 18

CaSO4.2H2O=CaSO4.1/2H2O= CaSO4

(GYPSUM) (PLASTER OF PARIS) DEAD BURNT PLASTER