examples of 5 one liner questions of chapter chemical reaction and equations with answers
CLASS 10TH
Answers
Answer:
Q-1 action of heat on blue virtriol is a physical as well as chemical change justify?
ans-1 When blue vitriol is heated,it loses it moisture , turns into white power. If we add water again, it again converts into blue color. So physical change Now when it is strongly heated, Copper Sulphate decomposes into Copper oxide and suphur dioxide.So it is a chemical change
Q-2 Explain whether the addition of dilute sulphuric acid to iron is a physical or chemical change.
ans-2 It is a chemical change as Iron react with dilute sulphuric acid to form Ferrous sulphate
Q-3 Balance the following equations after writing them as molecular equations.
a)Sodium + Nitrogen -> Sodium nitride
b) Aluminum + Chlorine -> Aluminum chloride
c)Iron (III) oxide + Hydrogen ->Iron + Water
d) Phosphorous + oxygen -> Phosphorus pentoxide
ans-3 a) 2Na + 3N2 -> 2NaN
b) 2Al + 3Cl2 -> 2AlCl3
c) Fe2O3 + 3H2 -> 2Fe + 3H2
d) P4 + 5O2 -> 2P2O5
Q-4 give four examples of physical change
ans-4 four examples of physical change
⚫Melting an ice cube.
⚫Casting silver in a mold.
⚫Breaking a bottle.
⚫Boiling water.
⚫Evaporating alcohol.
Q-5 give five examples of chemical change
ans-5 five examples of chemical change.
⚫Burning of coal, wood, paper, kerosene, etc.
⚫Formation of curd from milk.
⚫Electrolysis of water to form hydrogen and oxygen.
⚫Rusting of iron.
⚫Bursting of a cracker.