Advertisements
Advertisements
प्रश्न
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
विकल्प
oxidation
reduction
उत्तर
oxidation
\[\ce{Fe++->Fe+++}\] [∵ loss of electron]
संबंधित प्रश्न
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
What do you observe when Iron nail is kept in copper sulphate solution for sometime.
Give reason.
Wasp sting is treated with vinegar.
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Explain the term reactant and product giving examples.
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
State the main characteristics of chemical reactions. Give at least one example in each case.
What is observed in performing the following :
Hydrogen | Oxygen | Carbon dioxide | Chlorine | |
Litmus test | ||||
Apply a burning splint to the gas | ||||
Colour of gas | colourless | colourless | colourless | greenish-yellow |
Odour of gas |
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Give a chemical test to distinguish between the following gases.
H2 and O2
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
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.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Write a note on the following:
Curdling of milk
Photosynthesis is a chemical charge. Justify your answer.