Advertisements
Advertisements
प्रश्न
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Advertisements
उत्तर
Fe2O3 + 2Al → Al2O3 + 2Fe => Displacement reaction.
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
Define precipitation reaction.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
Explain the type of reactions on the basis of the direction of reaction.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Oxygen is a ______ in respiration.
When electric current is passed through acidulated water ______ of water takes place.
Give an example of a reaction where the following are involved
Heat
Write the chemical reaction where the following changes are observed.
Physical state is changed
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
Give a suitable example with an equation to show the representation of a chemical reaction.
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
Which of the following is not an “element + element → compound” type reaction?
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
What is the use of indicator?
Rusting of iron is ______.
