Chemical Reacti...

Which of the following are combination reactions?

(i) 2KClO₃ → 2KCl + 3O₂

(ii) MgO + H₂O → Mg(OH)₂

(iii) 4Al + 3O₂ → 2Al₂O₃

(iv) Zn + FeSO₄ → ZnSO₄ + Fe

In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

Which of the following are exothermic processes?

1. Reaction of water with quick lime
2. Dilution of an acid
3. Evaporation of water
4. Sublimation of camphor (crystals)

Which one of the following processes involve chemical reactions?

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed? 

1. It is an endothermic reaction
2. It is an exothermic reaction
3. The pH of the resulting solution will be more than seven
4. The pH of the resulting solution will be less than seven

What happens when dilute hydrochloric acid is added to iron filings?

The following reaction is an example of a

4NH₃ (g) + 5O₂ (g) → 4NO(g)+ 6H₂O(g)

1. displacement reaction
2. combination reaction
3. redox reaction
4. neutralisation reaction 

Chemically rust is