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- 1. Multiple-choice20 seconds1 pt
Chemical formula of quick lime is :
CaO
Ca(OH)2
CaCO3
CO2
- 2. Multiple-choice30 seconds1 pt
Silver article turns black when kept in open for a few days due to formation of
H2S
AgS
AgSO4
Ag2S
- 3. Multiple-choice30 seconds1 pt
A chemical equation should be balanced to :
show conservation of energy
show conservation of mass
to make equation attractive
All of the above
- 4. Multiple-choice30 seconds1 pt
In which of the following process a chemical reaction has taken place?
Ice melts into water
A wet shirt got dried in sunlight
A brown layer is formed over iron rod kept in air
sugar getting dissolved in water
- 5. Multiple-choice30 seconds1 pt
Which of the following is not a chemical reaction ?
Formation of salt solution
Milk turns sour in hot weather
Burning of match stick
Contamination of food
- 6. Multiple-choice30 seconds1 pt
An unbalanced chemical equation is written in :
Simple form
Proper form
Unorganized form
Skeletal form
- 7. Multiple-choice30 seconds1 pt
The reaction in which two compound exchange their ions to form two new compounds is called
displacement reaction
combination reaction
redox reaction
double displacement reaction
- 8. Multiple-choice30 seconds1 pt
Which of the following gases can be used for storage of fresh sampel of an oil for a long time?
Carbon dioxide or oxygen
Nitrogen or helium
Helium or oxygen
Nitrogen or oxygen
- 9. Multiple-choice30 seconds1 pt
The chemical formula of lead sulphate is :
Pb2SO4
Pb(SO4)2
PbSO4
Pb2(SO4)3
- 10. Multiple-choice30 seconds1 pt
Which of the following reactions involves the combination of two elements :-
CaO + CO2 -> CaCO3
4Na + O2 -> 2Na2O
SO2 +(1/2)O2 -> SO3
NH3 + HCI -> NH4CI
- 11. Multiple-choice30 seconds1 pt
3.What happens when copper rod is dipped in iron sulphate solution :-
Copper displaces iron
Blue color of copper sulphate solution is obtained
No reaction takes place
Reaction is exothermic
- 12. Multiple-choice30 seconds1 pt
7.The equation
Cu + xHNO3 -> Cu(NO3)2 + yNO2 + 2H2O
The values of x and y are
3 and 5
8 and 6
4 and 2
7 and 1
- 13. Multiple-choice30 seconds1 pt
In the following equation:
Na2CO3 + xHCI -> 2NaCI +CO2 + H2O, the value of x is
1
2
3
4
- 14. Multiple-choice30 seconds1 pt
White silver chloride in sunlight turns to :
Grey
Yellow
Remain white
Red
- 15. Multiple-choice30 seconds1 pt
Which of the following does not corrode when exposed to the atmosphere-
Fe
Cu
Au
Ag
- 16. Multiple-choice30 seconds1 pt
Black and white photography uses
Decomposition of silver chloride
Decomposition of silver bromide
Both
None of these
- 17. Multiple-choice30 seconds1 pt
Rusting of an iron is an example of :
Reduction
Ionization
Oxidation
Dissociation
- 18. Multiple-choice30 seconds1 pt
A redox reaction is one in which :
Both the substance are reduced
Both the substance are oxidized
An acid is neutralized by the base
One substance is oxidized while the other is reduced
- 19. Multiple-choice30 seconds1 pt
Which of the following product is formed when calcium oxide reacts with water?
Slaked lime
Carbon dioxide
Calcium oxide
Oxygen gas
- 20. Multiple-choice30 seconds1 pt
Heating of ferrous sulphate gives which of the following product?
Ferric oxide
Sulphur dioxide
Sulphur trioxide
All the above
- 21. Multiple-choice30 seconds1 pt
Heating of ferrous sulphate gives which of the following product?
Ferric oxide
Sulphur dioxide
Sulphur trioxide
All the above
