Advertisements
Advertisements
Question
Give reason for the following:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
Advertisements
Solution
A characteristic change of colour is seen when piece of iron is added to Copper (II) sulphate Solution. This is because iron displaces copper from the copper sulphate solution and forming ferrous sulphate
CuSO4 + Fe → FeSO4 + Cu.
Hence, Blue colour of the solution in changes to pale green and there is a reddish brown deposits on copper.
APPEARS IN
RELATED QUESTIONS
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
Fill in the blank
A new substance is formed in a _______ change.
State what you would observe when the following substance is heated in a glass test tube red lead.
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)
Electron ______ is complete in each hydrogen in a hydrogen molecule.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
What do you understand by precipitation reaction? Explain with examples.
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of water to quicklime.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A coloured substance which leaves a black residue and evolves two gases one of which is acidic and coloured and the other neutral and colourless.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper nitrate to nitrogen dioxide
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
The changes in which new substance with new chemical properties are formed are ______.
Silver articles turning black: ______:: Boiling of H2O: physical change ______.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
Explain how the painting of an iron gate prevents it from rusting.
Give an example where heat, light, and sound are produced during a chemical change.
How can we prevent rusting?
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
