Heating Effect

Question 1

Metal Carbonate + Heat

Answer 1

Metal oxide + CO₂

Question 2

BeCO_{3 + Heat}

Answer 2

BeO + CO2

Beo is amphoteric

Question 3

Na₂CO_{3 + Heat}

Answer 3

No reaction

Question 4

K₂CO_{3 + Heat}

Answer 4

No rxn

Question 5

Rb₂CO_{3 + heat}

Answer 5

No rxn

Question 6

Cu₂CO₃(OH)_{2. Malachite}

Answer 6

CuO + CO2 + H20 —1100°C—->
Black

Cu₂O + O2
Red

Question 7

PbCO₃ • Pb(OH)_{2 at 300°C}

Answer 7

Pb₃O₄+ CO +CO2
Red

Question 8

PbCO_{3 • Pb(OH)2 at 600 - 800°C}

Answer 8

PbO + CO2
Yellow

Question 9

Metal Bicarbonate + Heat

Answer 9

Metal Carbonate + CO2 + H2O

Question 10

Metal Sulphate + Heat

Answer 10

Metal Oxide + SO3

> 800°C SO2 + O2

Question 11

Metal Sulphate + Heat

Answer 11

Metal Oxide + SO3

> 800°C SO2 + O2

Question 12

CuSO₄ 6H2O at 100`C
Blue Vitriol

Answer 12

CuSO₄ H2O
(white)

Question 13

CuSO₄ H2O at 220`C
(white)

Answer 13

CuSO4

Question 14

CuSO₄ at 750`C
(white)

Answer 14

CuO + SO3
Black

Question 15

CuSO₄ at 1100`C
(white)

Answer 15

Cu₂O + O2
Red

Question 16

FeSO4.7H2O at 300`C FeSO4 more heat
Green virtriol

Answer 16

Fe₂O_{3 + SO2 + SO3}

A reaction where SO2 and SO3 both occur

Question 17

CaSO4.2H2O at 120C >120C 1100C

Answer 17

120C –> CaSO4 . 0.5H2O (POP)
>120C –> CaSO4 (dead burnt plaster)
1100C –> CaO + SO2+ O2

Dead burnt plaster cannot be reversed back to POP by adding H2O

Question 18

NaHSO3 + heat –> + heat –>

Answer 18

heat –> Na₂S₂O₅ + SO2
heat –> Na₂S + Na₂SO4

iniitially S +2 undergoes DPR to S-2 and S+6

Question 19

Metal Nitrate + Heat

Answer 19

Metal Oxide + NO2 + O2

Question 20

NaNO3 + heat

Answer 20

NaNO2 + O2 again heat –>Na₂O+ N2 + O2

Question 21

KNO3 + heat

Answer 21

KNO2 + O2 again heat –> K₂O + N2 + O2

Question 22

NaNO3 at 500C

Answer 22

NaNO2 + O2

Question 23

NaNO3 at 800C

Answer 23

Na₂O + N2 + O2

Question 24

Heating of ammonium salt when anion is oxidising in nature

Answer 24

N2 or N₂O

Question 25

Heating of ammonium salt when anion is non-oxidising in nature

Answer 25

NH3

Question 26

(NH4)₂Cr₂O₇ + heat Orange

Answer 26

Cr₂O₂ + N2 + H2O

Question 27

NH₄Cl + Heat

Answer 27

NH3 + HCl

Question 28

Heating 1 Phosphate

Answer 28

Metaphosphate

Question 29

Heating 2 Phosphate

Answer 29

Pyrophosphate

Question 30

Heating 3 Phosphate

Answer 30

No rxn

Question 31

Microcosmic Salt

Answer 31

Na(NH4)HPO₄4H20

Question 32

Heating Microcosmic Salt

Answer 32

NaPO3 + NH3 + H2O ## Footnote Na(NH4)HPO₄4H20

Question 33

HgI2 + --> Heat Scarlet Red

Answer 33

<-- cool HgI2 Yellow

Question 34

Hg₂Cl₂ + Heat

Answer 34

HgCl2 + Hg ## Footnote DPR

Question 35

MgCl₂6H20 + Heat

Answer 35

MgO + HCl + H2O

Question 36

PbO --> Fused Yellow Massicot

Answer 36

<-- cool PbO Red Litharge

Question 37

HgO + Heat Yellow

Answer 37

HgO + Heat --> Hg + O2 Red ( sindoor)

Question 38

Pb₃O₄ + Heat Red Oxide

Answer 38

PbO + O2 Red

Question 39

Ca(CH₃COO)₂ + Heat

Answer 39

CaO + CO2 + CH₃COCH₃

Question 40

Metal Acetate + Heat

Answer 40

Metal Carbonate + CH₃COOCH₃

Question 41

Metal Oxalate + Heat

Answer 41

Metal Carbonate + CO + CO2 ## Footnote Bot CO and CO2 formed in this rxn

Question 42

KMnO4 + Heat Dark Purple (+7)

Answer 42

K₂MnO₄ + MnO2 + O2 Green (+6) Black(+4)

Question 43

K₂Cr₂O₇ + Heat Orange (+6)

Answer 43

K₂Cr₂O₇ + Cr₂O₃ + O2