Applications of Displacement Reaction

Q. Why does iron nail become brownish in color when immersed in copper sulphate solution and and the blue color of the solution fade?

Q.

Give some real life examples of single replacement reactions?

Q.

What is a thermite reaction? Explain with the help of an equation. State one use of this reaction.

Q.

How does zinc metal reacts with water? Write a balanced chemical equation.

Q. Question 41(b)
Compound X and aluminium are used to join railway tracks. Name the reaction

Q.

An Ellingham diagram provides information about:

1. The pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals.

2. The conditions of pH and potential under which a species is thermodynamically stable.

3. The kinetics of the reduction process.

4. The temperature dependence of the standard Gibbs energies of formation of some metal oxides.

Q. Which of the following reactions represents thermite process?

1. 
2. 
3. 
4. 

Q.

Why does the colour of copper sulphate solution changes when iron nail is dipped in it?

Q.

Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
$\left(a\right)A{l}_2{O}_3+Fe\left(b\right)Mn{O}_2+Al\left(c\right)F{e}_2{O}_3+Al\left(d\right)C{u}_{2}O+Fe$

Q.

No chemical reaction takes place when granules of a rusty-brown solid A are mixed with the powder of another solid B. However when the mixture is heated, a reaction takes place between. It's components. One of the products C is a metal and settle down in the molten state while the other product D floats over it. It was observed that the reaction is highly exothermic.
(a) What could the solids A and B be?
(b) What are the products C and D most likely to be?
(c) Write the chemical equation for the reaction between A and B leading to the formation of C and D. mention the physical states of all the reactants and products in this equation and indicate the heat change which takes place.
(d) What is the special name of such a reaction? State one use of such a reaction.
(e) Name any two types of chemical reactions under which the above reaction can be classified.

Q.

Iron do not burn on heating but iron fillings burn.explain this statement. With the help of topic `metals reaction with oxygen` .

Q. On keeping iron nails in blue colour copper sulphate solution it is observed that the colour of the solution turns green after sometimes give reason for this colour change in the type of reaction

Q.

What changed do you observe in iron nails and color of copper sulphate solution when iron nails are does in copper sulphate solution.

Q.

If X displaces Y form its solution. This is known as displacement reaction. What is the other chemical name which you will give for this type of reaction.

Q.

Question 20.1

Write the balanced chemical equation for the following reaction and identify the type of reaction.

Thermit reaction: Iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.

Q.

Aluminium is used in thermite welding:

(a) What is thermit?

(b) What is ignition mixture?

(c) Write the reaction for this process?

Q. What will you observe when:-
i)Some zinc particles are put in copper sulphate solution
ii)Some silver pieces are put into green ferrous

Q.

Explain how, a reduction reaction of aluminium can be used for welding cracked machine parts of iron,
write a chemical equation for the reaction involved.

Q.

${Fe}_2{O}_3$ + $Al$ $\to$ $Fe$ + ${Al}_2{O}_3$
This is the reaction used in thermite welding process. Calcium can also be used instead of aluminium in this process.

1. True

2. False

Q. Beakers A, B, and C contain zinc sulphate, silver nitrate, and ferrous sulphate solutions respectively. Copper pieces are added to each beaker. Blue colour appears in the case of ___.

1. All the beakers
2. Beaker B
3. Beaker C
4. Beaker A

Q. Question 41(a)
Compound X and aluminium are used to join railway tracks.
(a) Identify the compound X

Q.

Magnesium burns in steam with an orange flame.

1. True
2. False

Q.

Complete the following chemical equations and balance them -

${\mathrm{Fe}}_2{\mathrm{O}}_3+\mathrm{\_\_}\stackrel{\mathrm{heat}}{\to }\mathrm{\_\_}+\mathrm{CO}$

Q.

_______ is a black sticky liquid formed during destructive distillation of coal.

Q.

What are the products formed during destructive distillation of coal?

Q.

Beakers A, B, and C contain zinc sulphate, silver nitrate, and ferrous sulphate solutions respectively.

Copper pieces are added to each beaker. The blue colour will appear in case of:

1. Beaker A

2. Beaker B

3. Beaker C

4. All the beakers

Q. Four test tubes named as (i)-(iv) are half-filled with colourless aqueous solution of $A{l}_2(S{O}_4{)}_3$.
A piece of metal zinc was placed in test tube (i), iron in test tube (ii), copper in test tube (iii) and aluminium in test tube (iv). The final colour in the four test tubes are:

1. $i\to \text{Colourless},ii\to \text{Blue}iii\to \text{Green},iv\to \text{Colourless}$
2. $i\to \text{Colourless},ii\to \text{Green}iii\to \text{Blue},iv\to \text{Colourless}$
3. $i\to \text{Green},ii\to \text{Blue}iii\to \text{Colourless},iv\to \text{Colourless}$
4. $i\to \text{Colourless},ii\to \text{Colourless}iii\to \text{Colourless},iv\to \text{Colourless}$

Q. What observations can be made during the reaction between iron sulphate and zinc ?

Q. Choose the correct statement for the aluminothermic process.

1. When a mixture of aluminium powder and iron oxide is ignited, the latter is reduced to metal.
2. When a mixture of aluminium powder and copper sulphate is ignited, the latter is reduced to metal.
3. When a magnesium strip is reacted with aluminium sulphate solution, magnesium sulphate is formed.
4. When an aluminium foil is reacted with calcium carbonate solution, the latter is reduced to metal.

Q.

Why cant we store AgNO3 solution in copper vessel ?