WorksheetsCH-1 CHEMICAL REACTIONS AND EQUATIONS
Total questions: 10
Worksheet time: 9mins
Give the ratio in which hydrogen and oxygen are present in water by volume.
1:2
1:1
2:1
1:8
MnO2 + 4HCl →MnCl2 + 2H2O + Cl2
Identify the substance oxidized in the above equation.
MnCl2
HCl
H2O
MnO2
What type of chemical reactions take place when electricity is passed through water?
Displacement
Combination
Decomposition
Double displacement
A substance added to food containing fats and oils is called:
Oxidant
Rancid
Coolant
Antioxidant
Which of the following are exothermic processes?
(i) Reaction of water with quick lime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)
(i) and (ii)
(ii) and (iii)
(i) and (iv)
(ii) and (iv)
Which of the following statements about the given reaction are correct?
3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4 H2 (g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent
(i), (ii) and (iii)
(i) and (iv)
(i), (ii) and (iv)
(ii) and (iv)
Oxidation is a process which involves-
addition of oxygen or removal of hydrogen
addition of hydrogen or removal of oxygen
Which of the given products is formed when calcium oxide reacts with water?
Slaked lime
Carbon dioxide
Calcium oxide
Oxygen gas
The chemical formula of lead sulphate is
Pb₂SO₄
Pb(SO₄)₂
PbSO₄
Pb₂(SO₄)₃
Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation.
The surface of metal becomes shining
The reaction mixture turns milky
Odour of a pungent smelling gas is recorded
A colorless and odourless gas is evolved
