General
✓✗Which of these will cause a chemical change to occur?
- Grinding of wheat into flour
- Lighting of a gas stove
- Evaporation of water from a lake
- Ringing of an electric bell
General
✓✗Reaction of Zinc granules with dilute sulphuric acid is characterized by
- evolution of Hydrogen gas
- rise in temperature (exothermic)
- both ‘a’ and ‘b’ are correct
- none of these
General
✓✗The given reaction is an example of
- decomposition reaction
- combination reaction
- double displacement reaction
- displacement reaction
General
✓✗Which one of the statements is correct for the reaction ?
- ZnO is being oxidised
- CO is being reduced
- CO2 is being oxidised
- ZnO is being reduced
General
✓✗The sign used to indicate a reversible reaction is_____
General
✓✗A white precipitate will be formed if we add common salt solution to:
-
solution
-
solution
-
solution
-
solution
General
✓✗The chemical equations are balanced to satisfy which one of the following laws in chemical reactions?
- Law of conservation of momentum
- Law of conservation of mass
- Law of conservation of motion
- Law of conservation of magnetism
General
✓✗An equation which contain equal number of atoms of each element on both sides is
- balanced equation
- unbalanced equation
- chemical equation
- all the above
General
✓✗The process of respiration is:
- an oxidation reaction which is endothermic
- a reduction reaction which is exothermic
- a combination reaction which is endothermic
- an oxidation reaction which is exothermic
General
✓✗Which of the following is a combustion reaction?
- Boiling of water
- Melting of wax
- Burning of petrol
- None of these