Displacement Reaction

Q.

Which one of the following metals can displace copper from copper sulphate solution?

1. Zn

2. Au

3. None

4. Ag

Q.

Are Double Displacement Reactions Redox ?

Q.

What happens when a strip of zinc is dipped in a copper sulphate solution?

1. Blue colour of solution fades up.

2. Blue colour of solution becomes darker

3. Blue colour solution changes to red

4. Blue colour solution changes to orange

Q.

Explain giving one example for each of the following chemical changes :

(a) Double decomposition

(b) Thermal dissociation

(c) Reversible reaction

(d) Displacement reaction

Q.

What Do You Understand By Mechanism Of The Reaction?

Q. What is the reactivity series for non metals

Q.

Is adding salt to water a chemical reaction?

Q.

Which of the following metals, on reaction with acids like HCl does not form bubbles in the solution?

1. Zinc (Zn)

2. Gold (Au)

3. Aluminium (Al)

4. Iron (Fe)

Q. (i) What is observed when a solution of potassium iodide solution is added to a solution of lead nitrate?
(ii) Name the type of reaction.
(iii) Write a balanced chemical equation to represent the above chemical reaction.

Q.

Chlorine gas turns ___ potassium Iodide solution into ___ colored solution by releasing Iodine. This is a ___ reaction. (mention the colour and type of reaction)

1. Yellow-Brown, Colorless, Displacement

2. Reddish-Brown, Colourless, Displacement

3. Colorless, Reddish-Brown, Displacement

4. Colorless, Yellow-Brown, Displacement

Q. Dissolution of sugar in water is endothermic in nature. Then solubility of sugar in water ____________ with an increase in temperature.

1. Increases
2. Decreases
3. Remains constant
4. May increase or decrease

Q. Write chemical equations for the following word equation and balance them.
c) Calcium + Nitrogen → Calcium nitride

Q.

Hydrogen is obtained by displacement from :

(a) dilute sulphuric acid

(b) dilute hydrochloric acid

Write equations using zinc and Iron.

Why does copper not show similar behaviour ?

Q.

A neutralization reaction is a

1. physical and reversible change.

2. a physical change that cannot be reversed.

3. chemical and reversible change.

4. the chemical change that cannot be reversed.

Q.

Complete the following statements:

(a) The chemical change involving iron and hydrochloric acid illustrates a ___ reaction.

(b) In the type of reaction called ___ two compounds exchange their positive and negative redicals.

(c) A catalyst either ___ or ___ the rate of a chemical change but itself remains ___ at the end of the reaction.

Q. The given chemical equation is an example of a _________ reaction.

$N{a}_{2}S{O}_4+SrC{l}_2\to 2\mathrm{NaCl}+{\mathrm{SrSO}}_4$

1. double displacement
2. decomposition
3. displacement
4. combination

Q. What happens when dilute sulphuric acid is added to a compound of iron and sulphur

Q. Which is the least reactive metal among the following?

1. Gold
2. Iron
3. Aluminium
4. Zinc

Q.

Which of the following metals is used in the laboratory preparation of hydrogen gas?

1. Sodium

2. Zinc

3. Lead

4. Aluminium

Q.

The reaction in which more reactive element displaces the less reactive element from its compound is called:

1. combination reaction
2. displacement reaction
3. decompositon reaction
4. precipitation reaction

Q.

Why the solubility of sodium chloride in water increase with rise in temperature while that of lithium carbonate decreases

Q.

$\mathrm{Zn}+{\mathrm{H}}_2{\mathrm{SO}}_4(\mathrm{dil}.)\to {\mathrm{ZnSO}}_4+{\mathrm{H}}_2\uparrow$

The above reaction is a laboratory method for ${\mathrm{H}}_2$ gas preparation. Which form of Zn is used here?

1. Powder

2. Pellets

3. 1. Granules

4. Strips

Q. When dilute hydrochloric acid is added to iron filings, ___ reaction takes place.

Q.

A ____________ is a homogeneous mixture of two or more substances.

Q.

Complete the following reaction :

${\mathrm{Cl}}_2+\mathrm{KI}\stackrel{}{\to }-----+{\mathrm{I}}_2$

Q. Iron nails were dipped in a solution kept in a test tube. After half an hour, it was observed that the colour of the solution has changed. The solution present in the test tube before the reaction was that of:

1. Zinc sulphate
2. Copper sulphate
3. Iron sulphate
4. Aluminium sulphate

Q.

Seawater can be classified as a homogeneous mixture as well as a heterogeneous mixture. Comment.

Q.

Give examples for non-aqueous solutions.

Q.

Mercury + sulphuric acid $\to$ No reaction. This is because:

1. Mercury is a liquid.

2. Sulphuric acid is a weak acid.

3. Mercury is above hydrogen in reactivity series.

4. Mercury is below hydrogen in reactivity series.

Q.

Give one example of each of the following.

c) solid-liquid homogeneous mixture.