CHEMICAL REACTIONS AND EQUATIONS
Q1) Prove that the following reactions are redox. Also find
oxidizing and reducing agent
4NH3 + 5O2 → 4NO + 6H2O ,
3Fe + 4H2O→ Fe3O4 + 4H2
Q2) Which of the following are exotherminc/endothermic
process? Give reason
1. Reaction of water with quick lime 2. Dilution of an acid 3. Evaporation of water 4. Sublimation of camphor
Q3) Identify the reducing agent in the following reactions
1. 4NH3 + 5O2 →
4NO + 6H2O 2.H2O
+ F2 → HF + HOF 3. Fe2O3 + 3CO → 2Fe +
3CO2 4. 2H2
+ O2 → 2H2O
Q4) Identify the oxidizing agent (oxidant) in the following
reactions
1. Pb3O4 + 8HCl
→ 3PbCl2 + Cl2 + 4H2O 2. 2Mg + O2 → 2MgO 3. CuSO4
+ Zn → Cu + ZnSO4 4. V2O5
+ 5Ca → 2V + 5CaO
Q5) A magnesium ribbon is burnt in oxygen to give a white
compound X accompanied by emission of light. If the burning ribbon is now
placed in an atmosphere of nitrogen, it continues to burn and forms a compound
Y.
1. Write the chemical formulae of X
and Y
2. Write a balanced chemical equation,
when X is dissolved in water.
Q6) Zinc liberates hydrogen gas when reacted with dilute
hydrochloric acid, whereas copper does not. Explain, why?
Q7) What happens when a piece of
1. Zinc metal is added to copper
sulphate solution
2. Aluminium metal is added to dilute
hydrochloric acid
3. Silver metal is added to copper
sulphate solution
Also , write the balanced chemical equation, if reaction
occurs
Q8) You are provided with two containers made up of copper
and aluminium. You are also provided with solutions of dilute HCl, dilute HNO3,
ZnCl2 and H2O. In which of the containers these solutions
can be kept
Q9) Balance the following chemical equation and identify
the type of chemical reaction
1. Mg + Cl2 → MgCl2
2. HgO → Hg + O2 3. Na + S → Na2S 4. TiCl4
+ Mg → Ti + MgCl2 5. CaO + SiO2 →
CaSiO3 6. H2O2
→ H2O + O2
Q10) Why silver chloride turns grey when exposed to
sunlight
