(i) When Zinc carbonate is calcined : ZnCo₃ ⟶ ZnO + CO₂↑ (ii) When manganese dioxide is heated with aluminum powder: 3MnO₂ + 4A1 ⟶ 3Mn + 2A1₂O₃ (iii) When magnesium is heated with very dil. HNO₃: Mg + 2HNO₃ ⟶ Mg(NO₃)₂ + H₂
(i) When Zinc carbonate is calcined :
ZnCo₃ ⟶ ZnO + CO₂↑
(ii) When manganese dioxide is heated with aluminum powder:
3MnO₂ + 4A1 ⟶ 3Mn + 2A1₂O₃
(iii) When magnesium is heated with very dil. HNO₃:
Mg + 2HNO₃ ⟶ Mg(NO₃)₂ + H₂
(i) Phenolphthalein gives a pink colour with soap because soap contains alkali in traces. (ii) By-products of chlor-alkali Process: NaOH, H ₂ and C1₂ (iii) Universal indicator specifies the various levels of H+ concentration.
(i) Phenolphthalein gives a pink colour with soap because soap contains alkali in traces.
(ii) By-products of chlor-alkali Process:
NaOH, H ₂ and C1₂
(iii) Universal indicator specifies the various levels of H+ concentration.
Quicklime reacts with water to form slaked lime (lime water). It is an exothermic reaction. That is why the container became hot. CaO + 2H₂O ⟶ Ca(OH)₂ + Heat When calcium hydroxide is applied on the wails, it reacts with atmospheric carbon dioxide to form calcium carbonate which gives a shining whitRead more
Quicklime reacts with water to form slaked lime (lime water). It is an exothermic reaction. That is why the container became hot.
CaO + 2H₂O ⟶ Ca(OH)₂ + Heat
When calcium hydroxide is applied on the wails, it reacts with atmospheric carbon dioxide to form calcium carbonate which gives a shining white coating on the walls.
Ca(OH) ₂ + CO₂ ⟶ CaCO₃ + H₂O
Chemical name for baking soda is sodium hydrogencarbonate and its formula is NaHCO₃. Preparation of baking soda: NaC1 + H₂O + CO₂ + NH₃ ⟶ NH₄C1 + NaHCO₃
Chemical name for baking soda is sodium hydrogencarbonate and its formula is NaHCO₃.
Preparation of baking soda:
NaC1 + H₂O + CO₂ + NH₃ ⟶ NH₄C1 + NaHCO₃
Write chemical equations for the following reactions: (i) When zinc carbonate is calcined. (ii) When manganese dioxide is heated with aluminium powder. (iii) When magnesium is treated with very dilute nitric acid.
(i) When Zinc carbonate is calcined : ZnCo₃ ⟶ ZnO + CO₂↑ (ii) When manganese dioxide is heated with aluminum powder: 3MnO₂ + 4A1 ⟶ 3Mn + 2A1₂O₃ (iii) When magnesium is heated with very dil. HNO₃: Mg + 2HNO₃ ⟶ Mg(NO₃)₂ + H₂
(i) When Zinc carbonate is calcined :
See lessZnCo₃ ⟶ ZnO + CO₂↑
(ii) When manganese dioxide is heated with aluminum powder:
3MnO₂ + 4A1 ⟶ 3Mn + 2A1₂O₃
(iii) When magnesium is heated with very dil. HNO₃:
Mg + 2HNO₃ ⟶ Mg(NO₃)₂ + H₂
Answer the following questions: (i) State the colour of phenolphthalein in soap solution. (ii) Name the by-product of chlor-alkali process which is used for the manufacture of bleaching powder. (iii) Name one indicator which specifies the various levels of H⁺ ion concentration.
(i) Phenolphthalein gives a pink colour with soap because soap contains alkali in traces. (ii) By-products of chlor-alkali Process: NaOH, H ₂ and C1₂ (iii) Universal indicator specifies the various levels of H+ concentration.
(i) Phenolphthalein gives a pink colour with soap because soap contains alkali in traces.
See less(ii) By-products of chlor-alkali Process:
NaOH, H ₂ and C1₂
(iii) Universal indicator specifies the various levels of H+ concentration.
Rama wanted her house to be whitewashed. She bought some quicklime from the market and dissolved it in water in a big tub. She noticed that the container became hot without any heating. Give reason for her observation with equation and name the product formed. What happens when it is applied on the walls?
Quicklime reacts with water to form slaked lime (lime water). It is an exothermic reaction. That is why the container became hot. CaO + 2H₂O ⟶ Ca(OH)₂ + Heat When calcium hydroxide is applied on the wails, it reacts with atmospheric carbon dioxide to form calcium carbonate which gives a shining whitRead more
Quicklime reacts with water to form slaked lime (lime water). It is an exothermic reaction. That is why the container became hot.
See lessCaO + 2H₂O ⟶ Ca(OH)₂ + Heat
When calcium hydroxide is applied on the wails, it reacts with atmospheric carbon dioxide to form calcium carbonate which gives a shining white coating on the walls.
Ca(OH) ₂ + CO₂ ⟶ CaCO₃ + H₂O
Write the chemical name and formula of baking soda. Write the balanced equation for the preparation of baking soda from sodium chloride.
Chemical name for baking soda is sodium hydrogencarbonate and its formula is NaHCO₃. Preparation of baking soda: NaC1 + H₂O + CO₂ + NH₃ ⟶ NH₄C1 + NaHCO₃
Chemical name for baking soda is sodium hydrogencarbonate and its formula is NaHCO₃.
See lessPreparation of baking soda:
NaC1 + H₂O + CO₂ + NH₃ ⟶ NH₄C1 + NaHCO₃
Write balanced chemical equations for the reactions of: (i) Aluminum with steam (ii) Calcium with water.
(i) 2A1 + 3H₂O (steam) ⟶ A1₂O₃ + 3H₂ (ii) Ca + 2H₂O ⟶ Ca(OH)₂ + H₂
(i) 2A1 + 3H₂O (steam) ⟶ A1₂O₃ + 3H₂
See less(ii) Ca + 2H₂O ⟶ Ca(OH)₂ + H₂