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- 1. Multiple Choice
What is an exothermic reaction
Reaction in which heat is evolved
Reaction reaction in which heat is involved
Reaction in which precipitate is formed
Reaction in which electricity is passed through the reactants
- 2. Multiple Choice
Which of the following is not a physical change
Boiling of water to give water vapour
Melting of ice to give water
Dissolution of salt in water
Combustion of LPG
- 3. Multiple Choice
Electrolysis of water into hydrogen and Oxygen gas is an example of which of the following
Combination reaction
Thermal decomposition
Electrochemical decomposition
Displacement reaction
- 4. Multiple Choice
barium chloride reacts with aluminium sulphate to give barium sulphate and aluminium chloride.This is an example of which type of reaction
Combination reaction
Decomposition reaction
Displacement reaction
Double displacement reaction
- 5. Multiple Choice
Which element is the most reactive from the given list barium ,silver,aluminium ,potassium
Barium
Aluminium
Potassium
Silver
- 6. Fill in the Blank
The reaction in which two or more substances combine to form a new substance is called ,.............. reaction
- 7. Fill in the Blank
The balancing of chemical equation is in accordance with the law of.........
- 8. Fill in the Blank
Oxidation involves ..............of electrons
- 9. Fill in the Blank
Food items containing fats and oils give foul smell when left for a long time because of....
- 10. Fill in the Blank
Reaction in which heat is absorbed is called.........reaction
- 11. Multiple Choice
What will happen when dilute hydrochloric acid is mixed with silver metal
Silver metal does not show any change
Colour of silver metal becomes black
Some gas is produced
Silver metal becomes hot
- 12. Multiple Choice
Why do we store silver chloride in dark coloured bottles?
Because silver is solid
It decomposes to silver and chlorine gas in the presence of sunlight
Silver is highly reactive
Silver chloride vaporizers
- 13. Fill in the Blank
2Na+ S----->
- 14. Multiple Choice
Identify the reducing agent
4NH3+5H2O-------->4NO2+6H2O
NH3
H2O
NO2
- 15. Multiple Choice
What happens when aluminium metal is added to dilute hydrochloric acid
No reaction
Aluminium displaces hydrogen to form aluminium chloride and hydrogen gas
Combination reaction takes place
- 16. Fill in the Blank
Oxidation of fats and oil present in food is called.........
- 17. Multiple Choice
Rancidity can be prevented by
Storing food in airtight containers
Flushing packets containing stored food with nitrogen gas
Adding antioxidants
All of the above a
- 18. Fill in the Blank
Balance the given chemical equation
Zn+ AgNO3--------->Zn(NO3)2+Ag
- 19. Fill in the Blank
Respiration is.,.............reaction( exothermic/ endothermic)
- 20. Fill in the Blank
When calcium oxide or quicklime is mixed with water it forms........
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