Pls ans Q3 all parts

Dear student,

A)

i) Na⁺      NO₃⁻

Cross change the valency

NaNO₃

Na⁺      PO₄³⁻

Cross change the valency

Na₃PO₄

Na⁺       SO₄²⁻

Cross change the valency

Na₂SO₄

Na⁺      Cl⁻

Cross change the valency

NaCl

Na⁺     HCO₃⁻

Cross change the valency

NaHCO₃

ii) Ca²⁺     NO₃⁻

Cross change the valency

Ca(NO₃)₂

Ca²⁺    PO₄³⁻

Cross change the valency

Ca₃(PO₄)₂

Ca²⁺     SO₄²⁻

Cross change the valency

CaSO₄

Ca²⁺      Cl⁻

Cross change the valency

CaCl₂

Ca²⁺     HCO₃⁻

Cross change the valency

Ca(HCO₃)₂

iii) Al³⁺    NO₃⁻

Cross change the valency

Al(NO₃)₃

Al³⁺       PO₄³⁻

Cross change the valency

AlPO₄

Al³⁺       SO₄²⁻

Cross change the valency

Al₂(SO₄)₃

Al³⁻      Cl⁻

Cross change the valency

AlCl₃

Al³⁺     HCO₃⁻

Cross change the valency

Al(HCO₃)₃

iv) Fe²⁺     NO₃⁻

Cross change the valency

Fe(NO₃)₂

Fe²⁺     PO₄³⁻

Cross change the valency

Fe₃(PO₄)₂

Fe²⁺      SO₄²⁻

Cross change the valency

FeSO₄

Fe²⁺    Cl⁻

Cross change the valency

FeCl₂

Fe²⁺    HCO₃⁻

Cross change the valency

Fe(HCO₃)₂

v) NH₄⁺   NO₃⁻

Cross change the valency

NH₄NO₃

NH₄⁺    PO₄³⁻

Cross change the valency

(NH₄)₃PO₄

NH₄⁺     SO₄²⁻

Cross change the valency

(NH₄)SO₄

NH₄⁺     Cl⁻

Cross change the valency

NH₄Cl

NH₄⁺    HCO₃⁻

Cross change the valency

NH₄HCO₃
b)
2HCl + 2Na  --- >  H₂ + 2NaCl
2Na + H₂SO₄ --> Na₂SO₄ + H₂
2Na + H₂CO₃ --> Na₂CO₃ + H₂

2HCl + Ca  --- >  H2 + CaCl₂
Ca + H₂SO₄ --> CaSO₄ + H₂
Ca + H₂CO₃ --> CaCO₃ + H₂

2HCl + Fe  --- >  H₂ + FeCl₂
Fe   + H₂SO₄ --> FeSO₄ + H₂
Fe   + H₂CO₃ --> FeCO₃ + H₂

6HCl + 2Al --- >  3H₂ + 2AlCl₃
2Al + 3H₂SO₄ --> Al₂(SO₄₎₃ + 3H₂
2Al + 3H₂CO₃ --> Al2(CO₃)₃ + 3H₂

C) test for hydrogen gas- Characteristic test for hydrogen (H2) gas can be performed by bringing a burning candle near the source of hydrogen. On doing so, hydrogen gas burns with a squeaky pop sound. Hydrogen gas is recognised by the 'pop' when it burns.

Regards