Advertisements
Advertisements
प्रश्न
Give one example electrochemical reaction.
Give an example electrochemical reaction.
Advertisements
उत्तर
Acidulated water breaks into hydrogen and oxygen.
\[\ce{2H2O ->[Electricity] 2H2 + O2}\]
संबंधित प्रश्न
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical 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)
A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.
Explain by writing a word equation.
Respiration is a chemical change.
Give an example of a reaction where the following are involved
Light
Multiple choice:
Thermal decomposition of sodium carbonate will produce
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
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 dilute acid to an active metal.
