WorksheetsChemical Reactions and Equations
Total questions: 10
Worksheet time: 8mins
On immersing
an iron nail in CuSO4 solution you will observe:
no reaction takes place
the colour of solution fades away
the surface of iron nails acquire a black coating
the colour of solution changes to green
When carbon dioxide is passed through lime water:
calcium hydroxide is formed
white precipitate of CaO is formed
calcium carbonate is formed
colour of lime water disappears
Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)
The given reaction is an example of:
double displacement reaction
combination reaction
displacement reaction
decomposition reaction
Which of the following is not a chemical reaction?
Formation of a salt solution
Milk turns sour in hot weather
Burning of a match stick
Spoiling of food
Which of the following is not an example of an exothermic reaction?
Decomposition of vegetable matter into compost
Burning of natural gas
Respiration
Decomposition of silver nitrate
Zn2+ (aq) + 2e- ⎯⎯→ Zn(s) this is:
Oxidation
Reduction
Redox
combination reaction
Some stale food gives a bad taste and bad smell because of:
Heating
Displacement
Corrosion
Rancidity
CuO + H2 ⎯⎯→Cu + H2O Identify the substance that is reduced in the above reaction:
copper oxide
copper
hydrogen
oxygen
Quicklime and carbon dioxide gas are formed when:
limestone is heated
carbon monoxide and copper sulphate are heated
limestone and calcium chloride are mixed
limestone is dissolved in water
