Write balanced chemical equations for the following statements: (2014)

(i) NaOH solution is heated with zinc granules.

(ii) Excess of carbon dioxide gas is passed through lime water.

(iii) Dilute sulphuric acid react with sodium carbonate.

(iv) Egg shells are dropped in hydrochloric acid.

(v) Copper (II) oxide reacts with dilute hydrochloric acid.

Give one example each of a chemical reaction characterised by:
(i) evolution of a gas
(ii) change in colour
(iii) formation of a precipitate
(iv) change in temperature
(v) change in state. (CBSE 2016)

Observe the diagram given alongside and answer the following questions:

a. What do you observe when lead nitrate is heated?

b. Mention the two gases evolved equation for it.

c. Write the balanced chemical equation for it.

d. What is the type of chemical reaction called?

e. Give one more example of this type of reaction.(CBSE 2008)

You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute HCl, dilute HNO₃, ZnCl_2, and H₂O. In which of the above containers these solutions can be kept? (CBSE  2008)

You are provided with a container made up of aluminium. You are also provided with solutions of dil HCl, dil HNO₃, ZnCl₂ and H₂O. Out of these solution which solution, can be kept in the aluminium container? Name the type of reaction taking place. (2013)