Advertisements
Advertisements
प्रश्न
When electric current is passed through acidulated water ______ of water takes place.
विकल्प
Oxidation
Displacement
Electrolysis
Reduction
zinc
copper
Double displacement
Decomposition
उत्तर
When electric current is passed through acidulated Decomposition of water takes place.
Explanation:
Electrolysis take place, divide water in the ratio 2 :1 hydrogen and oxygen and the reaction is a decomposition reaction. It is decomposition reaction because when electricity is passed through the water a single compound split into two elements hydrogen and oxygen so it is called decomposition reaction.
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
Complete and balance the following chemical equations
Na + H2 O →
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
TRUE \ FALSE
Ammonia is a good oxidizing agent.
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Write the chemical reaction where the following changes are observed.
Physical state is changed
What do you observe? When
Sodium chloride solution is added to silver nitrate solution.
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 |
What do you observe when HCI is passed through a silver nitrate solution.
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.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
Silver articles turning black: ______:: Boiling of H2O: physical change ______.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think the formation of rust from iron is a chemical change?
Photosynthesis is a chemical charge. Justify your answer.
When carbon dioxide is passed through lime water ______.