NEW
Font size
WorksheetsChemical Reactions
Total questions: 20
Worksheet time: 10mins
What type of chemical reactions take place when electricity is passed through water?
Displacement
Combination
Decomposition
Double displacement
combination
double displacement
decomposition
displacement
no reaction takes place.
the colour of the solution fades away.
the surface of iron nails acquires a black coating.
the colour of solution changes to green.
When a magnesium ribbon is burnt in air, the ash formed is
black.
white.
yellow.
pink.
white
blue
grey
pink
When carbon dioxide is passed through lime water,
calcium hydroxide is formed and it is soluble.
white precipitate of CaO is formed which turns the lime water milky.
white colour of lime water disappears due to the formation of CaO.
In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
Lead sulphate
Lead acetate
Lead carbonate
Lead chloride
Barium chloride, on reacting with ammonium sulphate, forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of reaction involved?
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction
Only (ii)
Only (iv)
Both (i) and (iii)
Both (ii) and (iv)
Which of the given products is formed when CaO (quick lime) reacts with water?
Slaked lime
Carbon dioxide
Calcium oxide
Oxygen gas
The reaction in which two compounds exchange their ions to form two new compounds is called
displacement reaction.
combination reaction.
double displacement reaction.
redox reaction.
In which of the following is heat always given off?
Combustion reaction
Decomposition reaction
Combination reaction
Double displacement reaction
Which of the following is termed as an endothermic reaction?
Reaction in which heat is evolved
Reaction in which heat is absorbed
Reaction in which there is loss of oxygen
Reaction in which there is gain of hydrogen
Which of the following gases is produced when carbon is burnt in air?
Which of the following products is formed after heating of limestone (marble)?
Calcium oxide
Calcium carbonate
Oxygen gas
All of the above
Which metal is displaced when lead is put into a solution of copper chloride?
Pb
Cu
Cl
Ca
What happens when sodium sulphate solution is mixed with a solution of barium chloride?
Barium sulphate is formed
Sodium sulphate is formed
Sulphur dioxide gas is formed
No reaction takes place
What happens when Copper metal is dipped into a solution of zinc sulphate?
Copper sulphate is formed
Oxygen gas is formed
Zinc metal is separated
No reaction takes place.
Decomposition reaction
Double displacement reaction
Double displacement reaction
Displacement reaction
The amphoteric oxide among the given four is
(i) only
(ii) only
(i) and (iii)
(ii) and (iv)
