Advertisements
Advertisements
प्रश्न
Give reasons for the following:
The reaction of iron (III) oxide [Fe2O3] with heated aluminum is used to join cracked machine parts.
उत्तर
The reaction of iron (III) oxide with heated aluminum is a displacement reaction which is highly exothermic in nature. The amount of heat evolved is so large that the metals are produced in the molten state due to which this reaction is used to join cracked machine parts.
\[\ce{Fe2O3(s) +2Al(s)->2Fe(l) + Al2 O3(s) + heat}\]
APPEARS IN
संबंधित प्रश्न
Reaction of iron nails with copper sulphate solution is an example of
(a) Combination reaction
(b) Decomposition reaction
(c) Displacement reaction
(d) Double displacement reaction
What happens when a piece of iron metal is placed in copper sulphate solution? Name the type of reaction involved.
What happens when a zinc strip is dipped into a copper sulphate solution?
Write the equation for the reaction that takes place.
When a black metal compound XO is heated with a colourless gas Y2, then metal X and another compound Y2O are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas Y2 can be prepared by the action of a dilute acid on any active metal. The compound Y2O is a liquid at room temperature which can turn anhydrous copper sulphate blue.
(a) What do you think is metal X?
(b) What could be gas Y2?
(c) What is compound XO?
(d) What is compound Y2O?
(e) Write the chemical equation of the reaction which takes place on heating XO with Y2.
(f) What type of chemical reaction is illustrated in the above equation?
Fill in the blank.
The chemical change involving iron and hydrochloric acid illustrates a ...............reaction.
The colour of an aqueous solution of zinc sulphate as observed in the laboratory is:
(1) Green
(2) Yellow
(3) Blue
(4) Colourless
Explain the terms with examples.
Displacement reaction
Classify the following reaction into –
- Direct combination
- Decomposition
- Displacement
- Double decomposition
The reaction is – Zinc reacts with copper [II] sulphate to give zinc sulphate and copper.
- Complete the given chemical reaction:
\[\ce{CuSO4_{(aq)} + Fe_{(s)} ->}\] _______ + _______ - Name the type of the reaction.
\[\ce{Pb + CuCl2 -> PbCl2 + Cu}\]
The above reaction is an example of:
