Advertisements
Advertisements
प्रश्न
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
Advertisements
उत्तर
Electrolysis of water is the decomposition of water into hydrogen and oxygen due to the passage of electric current through it.
\[\ce{2H2O(l)->[Electric Current] 2H2 (g) + O2 (g)}\]
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Formation of manure from leaves is a physical change.
How do the following help in bringing about a chemical change?
light.
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
State four conditions necessary for chemical reactions to take place.
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)
Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
What do you observe? When
Water is added to the quick lime.
Name: Two carbonates do not produce carbon dioxide on heating.
Name: A greenish-yellow gas.
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
Photosynthesis is a chemical reaction that takes place in the presence of ______.
What is the role of a catalyst in a chemical reaction?
A reaction between an acid and a base is called ______.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
Galvanization is a process in which ______ is coated as a layer of iron.
Why is spoiling food a chemical change?
