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WorksheetsCEP2, Monika Mehta science
Total questions: 14
Worksheet time: 7mins
Why is the volume of gas collected at the cathode twice that at the anode?
Hydrogen is denser than oxygen.
Electrodes have different sizes
For every water molecule, 2 hydrogen atoms and 1 oxygen atom is released.
Oxygen dissolves in water easily
What kind of reaction has taken place between iron and copper sulphate?
Combination reaction
Double displacement reaction
Decomposition reaction
Displacement reaction
Which one of the following is not a chemical change?
Photosynthesis
Digestion of food
Evaporation of water
Respiration
What does this situation indicate?
Iron is dissolving in water.
Rusting is occurring due to reaction with air and moisture.
A physical change has occurred
Rainwater deposits mud which appears red in colour.
The solution with highest basic strength is
PH value of A is 8, B 11, C13, D10
A
B
C
D
Which substance should Rajwinder add to the soil and why?
Dilute hydrochloric acid, to increase acidity.
Lime (calcium oxide), to reduce acidity.
Common salt, to provide essential minerals.
Baking soda, to make the soil alkaline.
What is the most likely cause of the color change observed in silver chloride?
Silver chloride reacts with oxygen in the air to form silver oxide.
Silver chloride decomposes in sunlight to form silver metal and chlorine gas.
Silver chloride melts in sunlight, causing a colour change.
Silver chloride reacts with moisture to form hydrochloric acid.
What happens when iron reacts with copper sulphate solution to form iron sulphate and copper?
Iron is reduced, copper is oxidized
Iron is oxidized, Copper is reduced
Only iron is reduced
None of the above.
What is substance X?
Baking soda.
Washing soda.
Bleaching powder.
Sodium chloride
Why did the antacid help relieve his discomfort?
It increases the production of acid.
It neutralizes the excess acid in the stomach.
It lowers the pH further to aid digestion.
It makes more acid to kill the stomach bacteria
What is the most likely reason for this change?
Lemon juice is basic and reacts with marble, forming salt and water.
Lemon juice is acidic and reacts with the calcium carbonate in marble.
Lemon juice evaporates and leaves a sticky residue.
Marble absorbs the juice and changes color permanently.
What is the black substance formed?
Silver oxide.
Silver chloride
Silver sulfide
Silver nitrate
Why was his method dangerous?
Because acid evaporates quickly and causes burns.
Because adding water to acid generates large amounts of heat and may cause splashing.
Because water reacts with acid to form explosive gases.
Because the acid loses its strength when mixed with water first.
Plaster of Paris on mixing with water sets to form
Washing soda
Gypsum
Baking soda
No change occurs
