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What is the coloured product formed when magnesium ribbon is burnt?
White-coloured Mg2O
White-coloured MgO
Yellow-coloured MgO2
Grey-coloured MgO
White-coloured MgO is formed when magnesium ribbon is burnt.
A chemical reaction takes place in which of the following processes?
Boiling of water
Breaking of wood
Burning of wood
Sugar dissolved in water
A chemical reaction takes place when wood is burnt.
How will you infer that a reaction is taking place?
Evolution of gas
Change in colour
Rise in temperature
All of these
We can infer that a reaction is taking place by a change in colour, release of heat and evolution of gas.
An exothermic reaction does not take place in which of the following processes?
Combustion of coal
Neutralisation reaction
Rusting of iron
Melting solid salt
Melting of solid salt is an endothermic reaction.
Cottage cheese is formed by
Combination reaction
Precipitation reaction
Displacement reaction
Cottage cheese is formed by a precipitation reaction.
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