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
✓✗Which one of the following is not a characteristic of a chemical reaction?
- change in temperature, state and colour
- evolution of gas
- formation of a precipitate
- formation of no new substance
General
✓✗In the given equation, identify the substance that is being oxidised
- H2S
- Cl2
- S
- HCl
General
✓✗The substance which oxidises an element is called a/an
- neutralizing agent
- catalyst
- oxidising agent
- reducing agent
General
✓✗Which of the following is a redox reaction?
General
✓✗In the equation 
the substance undergoing oxidation is_____
the substance undergoing oxidation is_____
- lead dioxide
- hydrochloric acid
- hydrogen
- lead chloride
General
✓✗Rusting of iron is an example of
- combination reaction
- redox reaction
- corrosion
- all
General
✓✗What is the colour of the solution of Cu(NO3)2 ?
- colourless
- white
- light green
- blue
General
✓✗Which of the following is an incorrect formula?
General
✓✗The symbol H stands for_____ of hydrogen.
- one atom
- one molecule
- one ion
- two atoms