Preparation of Hydrogen

Answer the following question based on the given information. 
Hydrogen gas is an excellent fuel. It has a high calorific value and produces only water as the product of combustion. It is considered to be a potentially important, non-polluting energy source of the future. 

Hydrogen is labelled with different 'colours' based on the method by which it is produced, as given below: 
- green hydrogen: manufacturing process does not produce carbon dioxide 
- blue hydrogen: manufacturing process produces carbon dioxide but it is separated and stored 
- grey hydrogen: manufacturing process produces carbon dioxide which is released into the air 

Hydrogen can be prepared in the laboratory by reacting metals with acids. However, most of the hydrogen manufactured in the industry is by reacting methane with water at a high temperature. 
Which of the following is the likely reason why the reaction of metals with acids is not used to manufacture hydrogen on a large scale? 

Hydroxides of metals are formed upon reaction of metals with

Consider the following statements(s) regarding the preparation of hydrogen gas?

I. Reaction of potassium with cold water.

II. Reaction of calcium with boiling water.

III. Reaction of aluminium with steam.

IV. Reaction of iron with boiling water or steam.

The incorrect statement is:

Name two metals which react with steam and displace hydrogen. Write the balanced chemical equations.
 

Hydroxides of metals are formed upon reaction of metals with

Consider the following statements(s) regarding the preparation of hydrogen gas?

I. Reaction of potassium with cold water.

II. Reaction of calcium with boiling water.

III. Reaction of aluminium with steam

IV. Reaction of iron with boiling water or steam

The incorrect statement is 

Match the following columns:

The reaction of calcium and water is _____.(precipitation/decomposition)

How would you prepare dihydrogen from water by using a reducing agent?

Water upon reaction with sodium metal produce:

Name a metal that can displace silver from silver nitrate solution.

Imagine gold is reactive. Will it be still wanted? Why or why not?

State whether the following reaction is possible or not. Write P for possible and NP for not possible.
$\mathrm{Cu}\left(\mathrm{s}\right)+{\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)\to {\mathrm{CuSO}}_4\left(\mathrm{aq}\right)+\mathrm{Zn}\left(\mathrm{s}\right)$

Which of the following reactions is/are possible? Write P for those possible and NP for those not possible.

${\text{Cu + FeSO}}_4$$\left(\mathrm{sol}\right)\to {\text{CuSO}}_4$$+\text{ Fe}$

Which of the following reactions is/are possible? Write P for those possible and NP for those not possible.

${\text{Au + CuSO}}_4$$\left(\mathrm{aq}\right)\to {\text{AuSO}}_4$$+\text{ Cu}$

State whether the following reaction is possible or not. Write $\mathrm{P}$ for possible and $\mathrm{NP}$ for not possible.
$\mathrm{Fe}+{\mathrm{CuSO}}_4\left(\mathrm{Aq}\right)\to {\mathrm{FeSO}}_4 +\mathrm{Cu}$

Check whether the following reaction is possible or not? Write P if the reaction is possible, and NP if it is not possible.
$\mathrm{Zn}\left(\mathrm{s}\right)+{\mathrm{CuSO}}_4\left(\mathrm{aq}\right) \to {\mathrm{ZnSO}}_4\left(\mathrm{aq}\right)+\mathrm{Cu}\left(\mathrm{s}\right)$

A reaction in which a more reactive metal displaces a less reactive metal from its salt solution is called _____.(displacement reaction/substitution reaction)

Name a metal that can displace silver from silver nitrate solution. (This metal is mainly used as electric wires in electrical equipments)

How will you show that aluminium is more reactive than iron.